diff options
| author | mrb0nk500 <b0nk@b0nk.xyz> | 2020-05-18 13:14:08 -0400 |
|---|---|---|
| committer | mrb0nk500 <b0nk@b0nk.xyz> | 2020-05-18 13:14:08 -0400 |
| commit | 5dd788d5a1acc7f23835882420d50e9f020728ac (patch) | |
| tree | 2b9226863fc44e5bce88eb85be1f0ee97ede1922 /test/add-sub.s | |
| parent | 545bb8591e8003912b6c6b494acefd74e6b3abfd (diff) | |
Did alot of stuff while I was up at the family trailer.
- Moved the large enums, and large tables into separate
header files.
- Added enums for implementing the base extension
- Fixed a bug in the assembler.
- Worked more on SuBAsm.
Diffstat (limited to 'test/add-sub.s')
| -rw-r--r-- | test/add-sub.s | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/add-sub.s b/test/add-sub.s new file mode 100644 index 0000000..694931d --- /dev/null +++ b/test/add-sub.s @@ -0,0 +1,27 @@ +; Test adding, and subtracting. +; +; Written by mr b0nk 500 <b0nk@b0nk.xyz> + +; Main Program. +.org 0 +reset: + cps ; Clear the processor status register. + ldx.w #$FFFF ; Reset the stack pointer. + txs ; + lsr #16 ; Reset A. + tab ; Reset B. + tax ; Reset X. +up: + inc ; Increment the counter. + cmp #$FF ; Did the accumulator overflow? + bcs down ; Yes, so start decrementing. + jmp up ; No, so keep incrementing. +down: + dec ; Did the accumulator underflow? + beq up ; Yes, so start incrementing. + jmp down ; No, so keep decrementing. + +.org $FFC0 +.qword reset +a +d |