ChibiAkumas ASM Programming Forum

I'm planning to do some simple PDP-11 tutorials covering basic tasks on the UKNC Here is the early source code, if anyone spots any mistakes, please let me know HelloWorld.7z Here is 'Hello World'... I'll be covering it in the first tutorial - note the 'Monitor' is not code commented at this stage, ...

I'm guessing the sprite on the left is a glitch with the clipping code? Truth be told, my clipping code was very bad, because I'm awful at maths and stuff!... there was a bug in the final code, where if a code was clipped in the X and Y axis it would mess up... fortunately it almost never happened, ...

No, I'm afraid I don't have any tutorials on that mode... I'll be covering a pixel plotting function of the '3x tilemap' mode soon

Am I reading that right? that the screen has a resolution of 64x48???

Wow, that's absolutely amazing!... it must have taken an incredible amount of work to get any of the game working at all, and as for connecting an AY chip to the UKNC, that's really incredible.

Well, it's quite possible I am incorrect, I only did minimal research into the video, as it was a patreon request on a topic I've not looked at before. But can I ask.. you describe a procedure here, but do not describe how the hardware does it... it sounds like you're describing what the screen does...

Registers are going to be fastest, and you should try and use them as much as possible The stack is basically using the main memory... and if you think about the structure of the machine, the 'Registers' are built into the CPU... but the 'memory' is further away on the address bus (I know that's ove...

Really great work!... I got to level 7

the gameplay is really well done... it feels as good as an authentic space invaders game in the movement and collision detection.

I like the enemies too... they're cute and look funny!... Do they have names like in pacman?

The problem with the monitor not showing the correct value of A was a bug in the monitor asm file... I've fixed it in the latest sources.7z - please re-download and give it another go. I'm not sure why the SNES emulator is crashing - it's working OK here, I wonder if it's an issue with the emulator ...

Welcome to the forum! interesting to hear of your experiences with the old machines, I was a CPC person myself. I only did basic back in the days, and these days I don't do so much programming in my day job, so it's great to get to do some programming for fun in assembly! So you're looking at 6502 t...

Firstly make sure you've got interrupts disabled - the interrupt handler may mess with the VDP, so could be causing this.

If that fails, The VDP can take a little time to process the OUT commands... so put a few NOPs after each OUT and see if that fixes it.