Pi Pico video interface for z80 Modular Computer #piday #raspberrypi @Raspberry_Pi
Pi’s have a knack for reinvigorating retro tech. Fun one from keyvin on GitHub:
I’ve created a video interface for the z80 with a raspberry pi pico. Address selection is accomplished through a 74HCT154 and 74HCT32. Z80 Wait states are triggered when the Pico’s address is decoded via the 74hct32. Currently the Pico implements 4 IO ports – data register (00), x register (01), y register (02), and xy-width register(02). RGB levels come from the other PIO through a resistor DAC. The scanvideo library in pico-extras says it no longer supports 8bpp, so I wrote my own very simple 640×480 video mode fed via DMA. The Pico implements a 160×120 8 bit color output for the z80.
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