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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Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!