Commander X16

"unsigned int" is only 16 bits long and you're trying to use 17 bits of it. And this is less "DMA" and more "memcpy" to VRAM. Still Really useful though. Really good candidate for doing in assembly instead of C. Really good candidate for at least partially unwinding the...

And while we are at it, the same probably applies to a 6809 card allowing OS9 to run.

I'm not sure if this feature is even necessary, but can (in theory, with a expansion card) the Commander X16 run CP/M, in order to run some business software for CP/M, or even write new software for CP/M? This question seems stupid, but I'm just asking. This is less a "feature" of the CX1...

Yup. There are PET Emulators for the C64 that do exactly this and they work well enough, at least for BASIC programs, even though the C64 is maybe 3% slower than the PET due to the cycles that the VIC-II "steals" and even slower than that on a PAL C-64 given that they run a touch slower th...

You could probably pull off a VIC-20 emulator. VERA can do the VIC screen size. The screen size is small enough to scape an area of memory corresponding to the VIC-20 screen in an interrupt and update the VERA screen with the data. You can probably even do the same with the VIC ports. I had a PET em...

I wonder how hard it would be to map RAM instead of ROM. Keep the ROM, out of band and only accessible to the SMC. At bootup, the SMC copies the ROM into RAM and write protects it. SMC already listens on I2C, so add some I2C commands to it that would allow you to unprotect the RAM that is posing as ...

Unfortunately the polygon filler helper doesn't work the way you describe. It uses one data port for tracking the line, and the second for the column. So you can't just set the increment to 1 on each and go ahead. It also writes 4 bytes at a time, so the increment needs to be 4 (or 1) on one port a...

Start REAL easy. You can only move one block at a time and you can only turn 90 degrees. Render all of the textures as a 16 x 16 square. Use the affine helper to scale the textures. No example is given, but by changing the scale factor on each line, you can also use affine "scale" to "...

In the attached file if the "BVLOAD" statements are present, it fails with runtime ERROR2. If I remove them it works as expected. I did a test replacing the sprites with a different sprite. I did not get the error. I was testing with the to-be-released version, so it might be workingn now...

In the attached file if the "BVLOAD" statements are present, it fails with runtime ERROR2. If I remove them it works as expected.