The chip is more stable ever since i tryed 33pf load caps on the crystal

Thanks, I will likely learn about how to design and create this on a motherboard while keeping this in mind, Ill let yall know how this turns out!

I finally figured it out- other than all the other chips on the board the tms9918a used quite a bit of power and thus needed a more direct way of obtaining it then being hooked on multiple power lines above and below it. After adding a ground and power jumper to make it more directly attached to a ...

I dont know if this helps much, but I just realized that if I run the 6502/ram/rom clock slow enough then ~1/5 trys of restarting the 6502, then im able to successfully change the background with the code below. If its not successful when changing the color then it shows a garbled video and tv ...

Hello again, I finally finished the schematics but the image of the base computer is a bit blurry although still somewhat legible (I will never use smartdraw app to do this again since I had to export it as an image or pay):

SchematicsofTms9918anl.pdf

Im beginning to wonder if my 74hct138N isn't ...

it's usual to use a clock can (crystal oscillator) not a bare crystal - I see such a flat metal rectangular four-pin device at the bottom left of the original breadboard. Is that the one you're talking about?

That is the crystal oscillator at 1 mhz to drive the 6502, ram and 6522. The parallel ...

Have you remembered to reverse the data bus?

ya its reversed d0-cd7 etc

Here is an image of the board so far (ill probably get it all soldered when this issue is resolved)

WIN_20240210_17_54_23_Pro.jpg

Btw im using an sn74hct138N for memory decoding wired as so to the 65C02:

Enable pins:
G1 -- A14
G2AB (low-enable) -- A15
G2BB (low-enable) -- A13

Decoding ...

I have made my project exactly like krallja in this video: https://youtu.be/QYom_OBcBCY and followed along until I completed it in his following video: https://youtu.be/0QleiL-WdyM. I think it may be a failing tms9918anl since I have tried every series and parallel 10.738635 crystal resonator from ...