Commander X16

Compression routines often require offsetting from data already decompressed, which requires reading back from the current "pointer" Oh, and be careful with this, the value in DATA0/1 is set on an address change, not on a read. So if you set DATA0 to point to 0x00000, then change it using...

lda #1 sta VERA_ADDRH0 sta VERA_ADDRH1 lda #$FA sta VERA_ADDRM0 sta VERA_ADDRM1 lda #$00 sta VERA_ADDRL0 sta VERA_ADDRL1 I doubt there would be such a change at this point. Maybe VERA2? Anyway in the timebeing you can do this which isn't too many more cycles that the 'ideal' solution above. lda #1 ...

Looks great! Love the water!

I wonder if you could also extend the VIA timer by using VIA #2?

I think you'd be able to have a 17bit counter by checking the interrupt state of the VIA at the end.

But I don't think there is a way to increase the resolution above that without any CPU management.

Sometimes you want to know how long something takes to complete. While emulators generally do a good job of timing methods, they're not always accurate so there are times where you just have to check on the hardware. If the function takes less than ~65k cycles you can use the VIA1 timer to time your...

Good fun, love it!

I needed to get the current directory, but found the command `$=C` difficult to use as it returns the data as displayed in the BASIC prompt. So to make this more 'machine readable' I've written the code below which will return a pointer to a string in $yyxx which is null terminated in the form that ...

Yazwho wrote: ↑Wed Aug 28, 2024 7:39 pm The main purpose was to test my own emulator and development suite -- BitMagic -- to see how far it is from real hardware.

BitMagic now handles these side effects correctly!

I made a quick app to test how the memory addresses which have side effects (eg DATA0 with the stepping) react to different opcodes on a machine vs a real 65c02. The main purpose was to test my own emulator and development suite -- BitMagic -- to see how far it is from real hardware. As such it migh...

I don't know enough to comment on the composing side, but it looks and sounds awesome!