Long story condensed...
I am building a full featured 8 channel synthesizer with a built in operating system, tracking software, 40KHz sampling rate, waveform generator, and live keyboard input.
The best part is that it will be completely build with nothing more than 7400 logic chips and op amps (current parts, but available back in 1980).
The only other IC (out of probably 500+ ICs) that is not 7400 logic or SRAM will be a 6502 processor!
Also, every 7400 chip used is still in current production and in DIP form.
For now, I am doing all testing with an ATMega324.
The 40 pin chip burried under bus wiring at the top right of the board is the AVR324...
The bare bones 640x480 dual buffer VGA Generator - 100% Logic.
Here is a test frame, with a single Sprite being bit banged directly by the little AVR. The AVR writes to the "Back Buffer", waits for a Horizontal pulse, and then issues a command to "Flip" the buffers. This results in seamless and flicker free animations and refreshing. An old friend from my past moving around the screen...
Graphics look nice and crisp in 640x480
Originally, I thought 640x480 with 256 colors may be too much to do all with 74HC logic chips, but I managed 720x480...
HD Video from 1980's era components... Hell Yeah!
Here is a quick video showing a bunch of Logic Chips doing 640x480 VGA...
I will soon be removing the AVR to plug in the 6502, but for now this is still an AVR project!
Will also be adding a high speed Blitter all made in logic, since HD VGA is a lot for an 8 processor to manage.
If I could choose only one uC platform, it would still be AVR, even after my recent trip to the Dark Side.