diff options
| author | Thomas Albers Raviola <thomas@thomaslabs.org> | 2024-12-03 21:45:47 +0100 |
|---|---|---|
| committer | Thomas Albers Raviola <thomas@thomaslabs.org> | 2024-12-03 21:45:47 +0100 |
| commit | d46862a5bd2319c595b11427f781201ca063d194 (patch) | |
| tree | e83d3f40c60233a1da85334745b882f188b0be52 /asm | |
| parent | 9cd14efb76a4ddbcd013f44d50dc1ff93d56c4ca (diff) | |
Add bootloader
Diffstat (limited to 'asm')
| -rw-r--r-- | asm/crt0.asm | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/asm/crt0.asm b/asm/crt0.asm index 523c39e..fd03997 100644 --- a/asm/crt0.asm +++ b/asm/crt0.asm @@ -6,22 +6,22 @@ .area _HEADER (ABS) .org 0x0000 start: + di xor a ld i, a ld sp, #0x0000 - di ;; Init PIO and check for KEY2 ld a, #PIO_MODE_3 out (PORT_B_CTRL), a ld a, #0x7F out (PORT_B_CTRL), a in a, (PORT_B_DATA) - and #0x02 ; is KEY2 pressed? If so, start booloader + and #KEY2 ; is KEY2 pressed? If so, start booloader jr NZ, main ;; Load payload (bootloader) - ld HL, #0x7000 - ld DE, #0x8000 - ld BC, #0x1000 + ld hl, #0x7000 ; src + ld de, #0x8000 ; dest + ld bc, #0x1000 ; size ldir ;; Start bootloader jp 0x8000 |