diff options
| author | mrb0nk500 <b0nk@b0nk.xyz> | 2020-03-17 15:07:20 -0400 |
|---|---|---|
| committer | mrb0nk500 <b0nk@b0nk.xyz> | 2020-03-17 15:36:07 -0400 |
| commit | 071edf621a6722f94027f37720a5a5f73d9696c0 (patch) | |
| tree | 87761e6dca9e7cf47bf0b6f2d52e8e31623ac01a /test | |
| parent | 917f864a6d1304d9f0c650c107a5fd6576690cb7 (diff) | |
Revamped the opcode table, made the emulator more
efficient, and ported SuBEditor to C.
I revamped the opcode table to add another prefix bit
for the addressing mode, finally giving access to all
addresses, without wasting any bytes.
I made the stack based operations more efficient, by
sort of applying Duff's device to it.
And I ported SuBEditor to C, to make it easier for me
to figure out how to implement SuBAsm.
Diffstat (limited to 'test')
| -rw-r--r-- | test/subroutine.s | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/subroutine.s b/test/subroutine.s new file mode 100644 index 0000000..03447fd --- /dev/null +++ b/test/subroutine.s @@ -0,0 +1,45 @@ +.org $2000 +buf: + +.org $0 +ptr: +.qword buf + +.org $8000 +reset: + cps + ldx.w #$FFFF + txs +start: + ldy #0 + ldb #0 + inb + stb $C010 + deb + jsl clr_buf + jmp start + +clr_buf: + lda #0 + cpy.w #$1FFF + bcs clr_buf_end + sta.q (ptr), y + tya + adc #8 + tay + tba + sta.q (ptr), y + tya + adc #8 + tay + tba + jmp clr_buf +clr_buf_end: + ldy.w #0 + rtl + + +.org $FFC0 +.qword reset +done + |