Commander X16

Another update for anyone following along: Bitmap loading I believe the designer (Eric Chahi) got fed up towards the end of development and decided to just draw the rest of the game using bitmaps instead of polygons. So I had to code a bitmap decompressor. The game uses 4-bit planar bitmaps, which f...

Here's my implementation from my Another World port: .macro mulx_addr addra, addrb .scope ; Save original cache values lda FX_CACHE_L pha lda FX_CACHE_M pha lda FX_CACHE_H pha lda FX_CACHE_U pha ; DCSEL = 2 for FX control registers lda #(2 << 1) sta VERA::CTRL ; Clear FX control and enable multiplie...

I'm still at it - I reduced the game to 256x192. Took a fair bit of changes to the code, but made things about 20% faster. I implemented a frame wait/sync so the game runs capped at a max of 30fps where possible, otherwise, as fast as it can. Most of the time it hits the frame rate target. I wish I ...

very cool, I'll have to take some time to understand it. I wrote a similar routine for my AGI Interpreter, which needed to address memory up to 20-bits (1MB): ; uses A, X, Y as 20-bit address into banked ram .macro calc_bank_addr sta bank_temp ; Store low byte of target address ; Calculate bank numb...

doslogo wrote: ↑Wed Mar 19, 2025 10:26 pm So how do one stop the timer so the full 16-bit value can be read?

Did you use SEI before getting the values? If I understand correctly, you need to use SEI before, and CLI afterwards.

My 2c on the "yet another system" problem (I say this as someone who genuinely wants the CX16 to succeed...): The Commander X16's only "marketing" so to speak was through the 8-bit guy's Youtube channel. David appears to have lost interest in promoting it what with the arcade and...

This guy got Linux (sort of) running on an NES:
https://www.youtube.com/watch?v=OooHTDMUSGY

The DOS and Tandy versions of AGI games are the same files (that's the whole point of an interpreter lol) except for very early versions of Kings Quest. For the DOS interpreter it just plays the first voice in the sound file. I got 3 voice sound working on the PSG. I wrote a player for AGI sounds. I...

Thanks for the update, and the screen shots - the fairy, troll, and the well!!! Good memories. Still, I want to HEAR this game, someday ^.^ (oh, we can dual X16 it, use serial card to cue another X16 to play the audio with a few command bytes :P ) The PSG is perfect for playing AGI sounds - I got i...

Hi Everyone another update for those following along. I tried implementing the pseudo 4-channel mixing method for pcm audio (play 4x 11025hz samples at 44100hz). Unfortunately it did not work. I mean I got it working, but the game uses frequency shifts to change the pitch of sounds, which is not ent...