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Allow use with another fixed drive (eg: ESDI drive).

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This commit is contained in:
Matthieu Bucchianeri
2025-02-11 01:27:16 -08:00
parent bc538b2a5b
commit 34ac6ee4e0
2 changed files with 134 additions and 117 deletions
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21
XTMax/Drivers/BootROM/bootrom.asm
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@@ -287,7 +287,7 @@ int13h_entry:
mov TEMP1, dx ; save dx
pushf ; setup for iret from INT 13h handler
push cs ; setup for iret from INT 13h handler
mov ax, .return_common
mov ax, .return_from_int13h
push ax ; setup for iret from INT 13h handler
.simulate_int13h:
;
@@ -311,7 +311,24 @@ int13h_entry:
mov ax, TEMP0 ; restore ax
mov dx, TEMP1 ; restore dx
iret ; call the INT 13h handler
; will return at .return_common
.return_from_int13h:
pushf
push ax
mov ax, TEMP0 ; original ax
cmp ah, 0x08 ; is read parameters?
jne .skip_update_hdnum
mov ax, TEMP1 ; original dx
cmp al, 0x80 ; is fixed fixed?
jb .skip_update_hdnum
push es
mov ax, 0x40 ; BIOS data area
mov es, ax
mov dl, es:[0x75] ; HDNUM
pop es
.skip_update_hdnum:
pop ax
popf
jmp .return_common
;
; This is an operation for the SD Card. Use our own INT 13h logic.