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Change to 16-bit card ID register

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pjht 2022-11-23 10:49:38 -06:00
parent 5bb2733132
commit 82f3185f9c
2 changed files with 3 additions and 3 deletions
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6
boot/boot.68k
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@ -1,6 +1,6 @@
.global _start .global _start
_start: _start:
move.b #0x4, d0 move.w #0x4, d0 | Find a storage card
bsr.w find_first_card bsr.w find_first_card
| Load the header sector for the kernel binary | Load the header sector for the kernel binary
move.l #0x200, a1 | Set the destination address to 0x200 move.l #0x200, a1 | Set the destination address to 0x200
@ -53,9 +53,9 @@ find_first_card:
move.l #0xff0000, a0 | a0 holds the address of the current card move.l #0xff0000, a0 | a0 holds the address of the current card
ffc_loop: ffc_loop:
lea (0x100, a0), a0 | Move to the next card lea (0x100, a0), a0 | Move to the next card
move.b (0xff, a0), d1 | Load the type of the card into d1 move.w (0xfe, a0), d1 | Load the type of the card into d1
beq.b ffc_done | If the type is 0 (empty slot), we have scanned all cards, so exit the loop beq.b ffc_done | If the type is 0 (empty slot), we have scanned all cards, so exit the loop
cmp.b d0, d1 | If the card is the type we want, return with the address in a0 cmp.w d0, d1 | If the card is the type we want, return with the address in a0
beq.b ffc_done beq.b ffc_done
bra.b ffc_loop | Loop back and check the next card bra.b ffc_loop | Loop back and check the next card
ffc_done: ffc_done:

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rom.bin
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