X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/97d31911d562d3bbb07f44e027aa1886ac914a99..f8c46ff554cb7f4c067eab1234faf729118c4c25:/rom.asm diff --git a/rom.asm b/rom.asm deleted file mode 100644 index 640c2b0..0000000 --- a/rom.asm +++ /dev/null @@ -1,139 +0,0 @@ - SECTION "a",HOME -main: - ld c, $51 - ld a, $FF - ld [c],a - ld sp,$DFFF - - ld hl,text - call puts - - call memtest - call waitsw - jp main - -text: - db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0 - -memtest: - ld hl,memteststr - call puts - - ld hl, $C000 -.wr: - ld a,h - xor l - ld [hli],a - ld a, $DF - cp h - jp nz, .wr - ld a, $80 - cp l - jp nz, .wr - - ld hl, $C000 -.rd: - ld a,h - xor l - ld b,a - ld a, [hli] - cp b - jp nz, .memfail - - ld a, $DF - cp h - jp nz, .rd - ld a, $80 - cp l - jp nz, .rd - - ld hl, testokstr - call puts - ret -.memfail: - @ decrement hl the easy way - ld a,[hld] - push hl - ld hl, failatstr - call puts - pop hl - ld a, h - call puthex - ld a, l - call puthex - ld a, $0A - call putc - ld a, $0D - call putc - ret - -memteststr: - db "Testing memory from $C000 to $DF80...",0 -testokstr: - db " OK!",$0D,$0A,0 -failatstr: - db " Test failed at $",0 -puthex: - push af - rra - rra - rra - rra - ld b,$0F - and b - ld b,$30 - add b - call putc - pop af - ld b,$0F - and b - ld b,$30 - add b - call putc - ret - -waitsw: - ld hl,waitswstr - call puts - - ld c, $51 - ld a, $00 - ld [c],a - - ld c, $51 - ld b, $0 -.loop1: - ld a,[c] - cp b - jp z,.loop1 -.loop2: - ld a,[c] - cp b - jp nz,.loop2 - ret - -waitswstr: - db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset.",$0D,$0A,0 - -putc: - push af - ld b, 0 - ld c, $50 -.waitport: - ld a,[c] - cp b - jp nz,.waitport - pop af - ld [c],a - ret - -puts: - ld a, [hli] - ld b, $00 - cp b - jp z, .done - call putc - jp puts -.done: - ret - diff --git a/rom.asm b/rom.asm new file mode 120000 index 0000000..2dfb2b3 --- /dev/null +++ b/rom.asm @@ -0,0 +1 @@ +bootrom.asm \ No newline at end of file