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Jonathan Campbell
2019-03-21 18:23:12 -07:00
parent 954d62ad44
commit a2b9a0e86c
1 changed files with 141 additions and 0 deletions
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141
NOTES/PC-98 INT DCh/MS-DOS 5.00 boot144.md
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@@ -984,6 +984,147 @@ INT DC = 60:36B3
POP DS (restore caller DS)
IRET
--
0ADC:32DF: (CL=0Dh entry point)
ES = WORD PTR CS:[0030] ; MS-DOS segment (60h)
AX = WORD PTR DS:[05DB] ; AX from caller
DS = WORD PTR DS:[05E1] ; DS from caller
SI = DX ; DX from caller
IF AX > 0xFF JMP 32F7h ; CMP AX,00FF ; JA 32F7h
IF AX != 0xFF JMP 3310h ; ... JNE 3310h
JMP 3350h
0ADC:32F7: (AX > 0xFF)
IF AX < 0x101 JMP 3304h ; CMP AX,0101 ; JC 3304h
IF AX == 0x101 JMP 3308h ; ... JE 3308h
IF AX == 0x102 JMP 330Ch ; CMP AX,0102 ; JE 330Ch
0ADC:3303:
return
0ADC:3304: (AX < 0x101)
CALL 3445h
return
0ADC:3308: (AX == 0x101)
CALL 349Ch
return
0ADC:330C: (AX == 0x102)
CALL 3538h
return
0ADC:3310: (AX < 0xFF)
IF AX != 0 THEN AX--, JMP 3390h ; SUB AX, 1 ; JNC 3390h
0ADC:3315: (AX == 0, DS = caller DS segment, SI = caller DX register, ES = MS-DOS segment 60h)
DI = 2D2Eh ; This appears to be the memory location that holds the function key row strings and attributes
DL = 0Ah ; There are 10 entries, 16 bytes apart
0ADC:331A:
CALL 3547h ;
_fmemcpy(ES:DI, DS:SI, 0x0F) ; CX = 0x0F ; REP MOVSB
; Side effect: SI += 0x0F, DI += 0x0F
SI++
IF DL > 0 THEN DL--, JMP 331Ah ; DEC DL ; JNZ 331Ah
0ADC:3327:
DI += 0x50 ; Reminder: 2D2Eh + (0x10 * 0x0A) + 0x50 = 2E1Eh
; This (2E1Eh) appears to hold the text that is injected when the function key is pressed.
; For example by default this table defines F1 -> "DIR A:\x0D"
DL = 0Ah
0ADC:332C:
CALL 3547h
_fmemcpy(ES:DI, DS:SI, 0x0F) ; CX = 0x0F ; REP MOVSB
; Side effect: SI += 0x0F, DI += 0x0F
SI++
IF DL > 0 THEN DL--, JMP 332Ch ; DEC DL ; JNZ 332Ch
0ADC:3339:
DI += 0x50 ; Reminder: 2E1Eh + (0x10 * 0x0A) + 0x50 = 2F0Eh
DL = 0x0B
0ADC:333E:
CALL 3547h
_fmemcpy(ES:DI, DS:SI, 0x05) ; CX = 0x05 ; REP MOVSB
; Side effect: SI += 0x05, DI += 0x05
SI++
DI += 2
IF DL > 0 THEN DL--, JMP 333Eh ; DEC DL ; JNZ 333Eh
0ADC:334E:
JMP 3386h
0ADC:3350: (AX == 0xFF)
DI = 2D2Eh ; Memory location that appears to hold function key row strings
DL = 0x1E
0ADC:3355:
CALL 3547h
_fmemcpy(ES:DI, DS:SI, 0x0F) ; CX = 0x0F ; REP MOVSB
; Side effect: SI += 0x0F, DI += 0x0F
SI++
IF DL > 0 THEN DL--, JMP 3355h
0ADC:3362:
DL = 0x0B
0ADC:3364:
CALL 3547h
_fmemcpy(ES:DI, DS:SI, 0x05) ; CX = 0x05 ; REP MOVSB
; Side effect: SI += 0x05, DI += 0x05
DI += 2
IF DL > 0 THEN DL--, JMP 3364h
0ADC:3374:
DI = 0x2F86
DL = 0x0F
0ADC:3379:
CALL 3547h
_fmemcpy(ES:DI, DS:SI, 0x0F) ; CX = 0x0F ; REP MOVSB
SI++
IF DL > 0 THEN DL--, JMP 3379h
0ADC:3386:
IF BYTE PTR ES:[0111] == 0 THEN JMP 33ECh ; ES = DOS segment 60h
JMP 33ECh ; Wait... what?
0ADC:3390:
(TODO)
0ADC:33EC:
IF AX < 0x29 JMP 33E3h ; CMP AX, 29h ; JC 33E3h
IF AX > 0x39 JMP 33E3h ; CMP AX, 39h ; JA 33E3h
IF AX == 0x39 JMP 3417h ; ... JE 3417h
0ADC:33F8:
IF AX <= 0x32 JMP 3405h ; CMP AX, 32h ; JBE 3405h
IF AX != 0x38 JMP 33E3h ; CMP AX, 38h ; JNE 33E3h
0ADC:3402:
AX = 0x28
0ADC:3405:
DI = ((AX - 0x29) * 16) + 0x2F86
CX = 0x000F
JMP 33DEh
0ADC:3417:
AX = 0x38
PUSH DS, SI, DI
CALL 33F8h
POP DI, SI, DS
SI += 0x10
DI += 0x10
CX = 0x0A
0ADC:342C:
PUSH CX, DS, SI, DI
AX = 0x33 - CX
CALL 33F8h
POP DI, SI
DI += 0x10
SI += 0x10
POP DS, CX
IF CX > 0 THEN CX--, JMP 342Ch ; LOOP 342Ch
0ADC:3444:
return
0ADC:3445:
DI = 307Ah
SI += 2
AX = BX = 0
_fmemcpy(ES:DI, DS:SI, 0x200) ; CX = 0x200 ; REP MOVSB
0ADC:3454:
DI = 307Ah
CX = DI
CX += 0x200
IF DI >= CX JMP 346Fh ; CMP DI, CX ; JNC 346Fh
IF BYTE PTR ES:[DI] == 0 JMP 346Fh
AL = BYTE PTR ES:[DI] ; AH = 0 at this point
DI += AX
JMP 345Dh
0ADC:346F:
WORD PTR ES:[3076] = DI - 0x307A ; SUB DI, 307Ah ; MOV ES:[3076] DI
DI = 3078h
(TODO)
--
0ADC:355B: (CL=0Ah entry point)