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pascal@19515
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1 ;***************************************************************
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pascal@19515
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2 ;****** This file is distributed under GPL
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pascal@19515
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3 ;***************************************************************
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pascal@19515
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4 ideal
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pascal@19515
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5 %crefref
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pascal@19515
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6 %noincl
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pascal@19515
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7 %nomacs
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pascal@19636
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8 ifdef NO386
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pascal@19636
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9 p8086
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pascal@19636
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10 else
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pascal@19515
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11 p386
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pascal@19636
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12 endif
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pascal@19515
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13
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pascal@20451
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14 group DGROUP _TEXT,_BSS
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pascal@19515
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15 assume cs:DGROUP,ds:DGROUP
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pascal@19515
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16
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pascal@19515
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17
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pascal@19515
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18 segment _BSS byte public use16 'BSS'
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pascal@19515
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19
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pascal@19515
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20 saved15 dd ?
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pascal@19515
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21
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pascal@19515
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22 ends _BSS
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pascal@19515
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23
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pascal@19515
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24
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pascal@19515
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25 segment _TEXT byte public use16 'CODE'
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pascal@19515
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26
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pascal@19515
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27 ;***************************************************************
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pascal@19515
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28 ;u32 memtopz();
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pascal@19515
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29 ;***************************************************************
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pascal@19515
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30 proc _memtopz near
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pascal@19515
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31 ;***************************************************************
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pascal@19515
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32 ;u32 memtop_e801()
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pascal@19515
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33 ;***************************************************************
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pascal@19515
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34 ; proc _memtop_e801 near
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pascal@19515
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35
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pascal@19515
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36 xor cx,cx ;fix to work around buggy
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pascal@19515
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37 xor dx,dx ; BIOSes which dont clear/set
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pascal@19515
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38 stc ; carry on pass/error of
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pascal@19515
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39 mov ax,0E801h
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pascal@19515
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40 int 15h
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pascal@19515
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41 jc @@err
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pascal@20453
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42
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pascal@20453
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43 xchg ax,cx ;kludge to handle BIOSes
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pascal@20453
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44 jcxz @@use_cxdx ; which report their extended
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pascal@20453
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45 ; memory in AX/BX rather than
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pascal@20453
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46 ; CX/DX. The spec I have read
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pascal@19515
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47 @@use_axbx: mov dx,bx ; seems to indicate AX/BX
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pascal@19882
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48 xchg ax,cx ; are more reasonable anyway...
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pascal@20453
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49 @@use_cxdx: ;now: dx=64k units above 16m
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pascal@20453
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50 ; ax=1k units above 1m below 16m (max 3c00h)
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pascal@20510
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51 or dx,dx
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pascal@19515
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52 jz tokb ;dx=0 here, ax=kbs above 1m
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pascal@19515
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53 xor ax,ax ;ignore info on low 16M (assume full)
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pascal@19515
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54 ;add dx,100h ;account for low 16M
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pascal@19515
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55 inc dh ;account for low 16M (optimized)
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pascal@19515
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56 ret
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pascal@19515
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57 @@err:
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pascal@19515
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58 ; xor ax,ax
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pascal@19515
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59 ; cwd
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pascal@19515
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60 ; ret
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pascal@19515
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61 ; endp _memtop_e801
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pascal@19515
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62
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pascal@19515
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63
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pascal@19515
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64 ;***************************************************************
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pascal@19515
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65 ;u32 memtop_88()
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pascal@19515
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66 ;***************************************************************
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pascal@19515
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67 ; proc _memtop_88 near
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pascal@19515
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68
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pascal@19515
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69 mov ah,88h
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pascal@19515
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70 int 15h ;ax=kbs above 1m
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pascal@20142
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71 cmc ; error: cf=1 or ax=0
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pascal@20142
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72 sbb dx,dx
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pascal@20142
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73 and ax,dx ;
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pascal@20142
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74 jnz tokb ;happens on big mem systems
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pascal@19879
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75
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pascal@19879
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76 ;***************************************************************
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pascal@19879
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77 ;u32 memtop_cmos()
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pascal@19879
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78 ;***************************************************************
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pascal@19879
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79
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pascal@19879
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80 ;memtop_cmos:
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pascal@19879
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81 pushf
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pascal@19879
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82 call rdcmos17
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pascal@19879
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83 popf
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pascal@19515
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84 tokb:
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pascal@21757
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85 mov cl,10 ;multiply by 1024
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pascal@21757
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86 ifndef NO386
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pascal@21757
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87 add ah,4h ;account for 1024 low kb
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pascal@21757
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88 setc dl ; (optimized to death)
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pascal@21757
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89 shld dx,ax,cl
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pascal@21757
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90 shl ax,cl ; (kbytes -> bytes)
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pascal@21791
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91 ret
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pascal@21757
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92 else
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pascal@19634
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93 xor dx,dx
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pascal@19515
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94 add ah,4h ;account for 1024 low kb
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pascal@19515
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95 adc dx,dx ; (optimized to death)
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pascal@21791
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96 db 0A9h ; test ax,0C28Ch
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pascal@21791
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97 global N_LXLSH@ES:near
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pascal@21791
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98 N_LXLSH@ES:
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pascal@21791
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99 mov dx,es
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pascal@20142
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100 global N_LXLSH@:near
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pascal@20142
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101 N_LXLSH@:
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pascal@19883
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102 mov ch,0
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pascal@19515
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103 @@lp:
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pascal@19883
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104 shl ax,1
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pascal@19515
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105 rcl dx,1
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pascal@19515
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106 loop @@lp
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pascal@21791
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107 ret
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pascal@21791
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108 global N_LXLSH@4:near
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pascal@21791
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109 N_LXLSH@4:
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pascal@21791
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110 xor dx,dx
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pascal@21791
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111 mov cl,4
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pascal@21791
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112 jmp N_LXLSH@
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pascal@19515
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113 endif
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pascal@19883
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114
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pascal@19515
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115 ; endp _memtop_88
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pascal@19515
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116
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pascal@19515
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117 ; proc _memtopz near
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pascal@19515
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118
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pascal@19515
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119 ; call _memtop_e801
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pascal@19515
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120 ; jnz @@ok
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pascal@19515
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121 ; call _memtop_88
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pascal@19515
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122 ; jnz @@ok
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pascal@19879
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123 ; jmp memtop_cmos
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pascal@19515
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124
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pascal@20142
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125 rdcmos17: cli
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pascal@20142
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126 mov al,18h ; read bytes 17-18 from CMOS
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pascal@19515
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127 call @@rdcmos
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pascal@19515
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128 mov ah,al
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pascal@19515
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129 mov al,17h
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pascal@19515
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130 @@rdcmos: out 70h,al
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pascal@19515
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131 call @@ret
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pascal@19515
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132 in al,71h
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pascal@19515
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133 @@ret:
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pascal@19515
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134 ret
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pascal@19515
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135
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pascal@19515
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136
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pascal@19515
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137 ;***************************************************************
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pascal@19515
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138 ;u32 memtop();
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pascal@19515
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139 ;***************************************************************
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pascal@19515
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140 global _memtop:near
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pascal@19515
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141 _memtop:
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pascal@19515
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142 call _memtopz
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pascal@19515
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143 mov cx,40h ; min 4m
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pascal@19515
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144 ; If reported mem is ridiculously low, presume
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pascal@19515
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145 ; we had trouble detecting memory size
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pascal@19515
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146 cmp dx,cx
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pascal@19515
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147 jb @@set
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pascal@20451
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148 extrn _topmem:dword
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pascal@20528
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149 mov cx,[word _topmem+2]
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pascal@20528
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150 inc cx ; jcxnz
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pascal@20528
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151 loop @@topmemset
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pascal@20528
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152 mov ch,10h ; default = max 256m
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pascal@20528
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153 @@topmemset:
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pascal@19515
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154 ; Kernel can have trouble with initrd at very high addr:
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pascal@19515
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155 ; limit mem top to 256m
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pascal@19515
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156 cmp dh,ch
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pascal@19515
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157 jb @@done
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pascal@19515
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158 @@set:
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pascal@19515
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159 xchg ax,cx
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pascal@19515
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160 cwd
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pascal@19515
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161 xchg ax,dx
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pascal@19515
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162 @@done:
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pascal@19515
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163 ; Round down to page boundary.
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pascal@19515
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164 ; Or else initrd's tail may end up in last, partial page.
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pascal@19515
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165 ; Kernel will refuse to use such initrd.
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pascal@19515
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166 and ax,0f000h
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pascal@19515
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167 ;@@ok:
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pascal@19515
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168 ret
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pascal@19515
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169
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pascal@19515
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170 endp _memtopz
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pascal@19515
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171
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pascal@19515
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172 ;***************************************************************
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pascal@19515
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173 ;void hook_int15_88();
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pascal@19515
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174 ;***************************************************************
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pascal@19515
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175 global _hook_int15_88:near
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pascal@19515
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176 proc _hook_int15_88 near
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pascal@19515
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177
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pascal@19515
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178 ifndef xmm_hook
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pascal@19515
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179 mov ax,4300h
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pascal@19515
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180 int 2fh
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pascal@19571
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181 cmp al,80h ; 80h = XMS driver installed
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pascal@19515
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182 je @@skip
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pascal@19515
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183 endif
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pascal@19883
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184 xor bx,bx
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pascal@19883
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185 mov es,bx
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pascal@19571
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186 ifndef NO386
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pascal@19876
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187 push cs
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pascal@19876
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188 push offset int15_88
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pascal@19876
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189 pop eax
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pascal@19883
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190 xchg eax,[es:bx+15*4]
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pascal@19515
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191 mov [saved15],eax
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pascal@19515
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192 else
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pascal@19876
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193 mov ax,offset int15_88
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pascal@19883
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194 xchg ax,[es:bx+15*4]
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pascal@19515
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195 mov [word saved15],ax
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pascal@19876
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196 mov ax,cs
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pascal@19883
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197 xchg ax,[es:bx+15*4+2]
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pascal@19515
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198 mov [word saved15+2],ax
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pascal@19515
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199 endif
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pascal@21757
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200 ;push ds
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pascal@21757
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201 ;pop es
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pascal@19515
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202 @@skip:
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pascal@19515
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203 ret
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pascal@19515
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204 int15_88:
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pascal@19515
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205 cmp ah,88h
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pascal@19515
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206 je @@do88
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pascal@19515
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207 jmp [saved15]
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pascal@19515
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208 @@do88:
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pascal@19515
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209 pushf
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pascal@21302
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210 call [saved15]
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pascal@20510
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211 or ax,ax
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pascal@19515
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212 jnz @@iret
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pascal@19515
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213
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pascal@19515
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214 ;****** Read extended mem size (CMOS bytes 17h,18h (lo,hi))
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pascal@19515
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215 call rdcmos17
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pascal@19515
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216 @@iret:
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pascal@19515
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217 iret
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pascal@19515
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218
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pascal@19515
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219 endp _hook_int15_88
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pascal@19515
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220
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pascal@19515
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221 ends _TEXT
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pascal@19515
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222
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pascal@19515
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223 end
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pascal@19515
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224
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pascal@19515
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225 ;###### END OF FILE ############################################
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