diff options
| -rw-r--r-- | README | 5 | ||||
| -rw-r--r-- | built/echo-timer-version-d.bin | bin | 0 -> 32768 bytes | |||
| -rw-r--r-- | src-z80/core/main.z80 | 16 |
3 files changed, 12 insertions, 9 deletions
@@ -49,4 +49,7 @@ Available builds: Timer test. Only timer B is reloaded when it fires, timer A is left to loop on its own. built/echo-timer-version-c.bin - Timer test. Both timers are left to loop on their own. + Timer test. Both timers are left to loop on their own. Code for + initializing timer B is wrong so it doesn't work properly. + built/echo-timer-version-d.bin + What the previous ROM should have been, fixed timer B :| diff --git a/built/echo-timer-version-d.bin b/built/echo-timer-version-d.bin Binary files differnew file mode 100644 index 0000000..bf92e9b --- /dev/null +++ b/built/echo-timer-version-d.bin diff --git a/src-z80/core/main.z80 b/src-z80/core/main.z80 index 4018a1b..cb0329e 100644 --- a/src-z80/core/main.z80 +++ b/src-z80/core/main.z80 @@ -87,8 +87,8 @@ EntryPoint: ld (ix+0), $25 ld (ix+1), $03 ld (ix+0), $26 - ld (ix+0), $C9 - ld (ix+1), $FF + ld (ix+1), $C9 + ;ld (ix+1), $FF ld (ix+0), $27 ld (ix+1), $3F @@ -159,15 +159,15 @@ DoTick: bit 0, a call nz, UpdatePCM - ld (ix+0), $26 ; Reset timer -.timerset: - ld (ix+1), $C8 +; ld (ix+0), $26 ; Reset timer +;.timerset: +; ld (ix+1), $C8 ld (ix+0), $27 ld (ix+1), $2F - ld a, (.timerset+3) ; $C8 is too fast, $C9 is too slow - xor $01 ; So, we alternate between them to compensate - ld (.timerset+3), a +; ld a, (.timerset+3) ; $C8 is too fast, $C9 is too slow +; xor $01 ; So, we alternate between them to compensate +; ld (.timerset+3), a PollPCM |