RP2040 Datasheet -- https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf

Libraries -- https://datasheets.raspberrypi.com/pico/raspberry-pi-pico-c-sdk.pdf

Pi Pico W Datasheet -- https://datasheets.raspberrypi.com/picow/pico-w-datasheet.pdf

Internet with Pico W -- https://datasheets.raspberrypi.com/picow/connecting-to-the-internet-with-pico-w.pdf

Hardware Design -- https://datasheets.raspberrypi.com/rp2040/hardware-design-with-rp2040.pdf

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Pico Examples

https://www.youtube.com/watch?v=YafifJLNr6I Life With David: Raspberry Pi Pico PIO - Ep. 1 - Overview with Pull, Out, and Parallel Port https://github.com/LifeWithDavid/Raspberry-Pi-Pico-PIO/blob/main/PIO%20Parallel%20Port

Bitbanged DVI -- https://github.com/Wren6991/PicoDVI

https://github.com/raspberrypi/pico-examples https://github.com/raspberrypi/pico-playground/ https://github.com/raspberrypi/pico-examples/blob/master/pio/logic_analyser/logic_analyser.c https://github.com/raspberrypi/pico-playground/issues/8

https://forum.lvgl.io/t/raspberry-pi-pico-pio-proof-of-concept-15m-pixels-sec/5716 uses a PIO state machine and 8 bits parallel data path -- https://github.com/zapta/pio_tft/tree/main/platformio/src

https://hackaday.io/project/177817-rp2040-pio-case-study

https://octodon.social/@phooky/106001326288342214 The #a2pico is a small expansion board for the Apple IIe bus

https://github.com/dp111/PicoTube Raspberry Pi Pico to BBC Micro Tube 6502 Core

https://github.com/phooky/bootarooni/tree/main/firmware A Raspberry Pi Pico (RP2040) based Apple IIe expansion card with USB isolation.

https://learn.adafruit.com/neopio-drive-lots-of-leds-with-raspberry-pi-pico/code-walkthrough-pio

https://www.tomshardware.com/news/pico-powered-6502-loderunner Raspberry Pi Pico Emulates 6502 Computer and Runs Loderunner

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Coco3 Hardware

https://colorcomputerarchive.com/search?q=schematic Lots of Schematics

MC6809E, MC68A09E, MC68B09E: https://colorcomputerarchive.com/repo/Documents/Datasheets/MC6809E%20HMOS%208%20Bit%20Microprocessor%20(Motorola).pdf

Also here: http://www.bitsavers.org/components/motorola/_dataSheets/6809E.pdf

https://colorcomputerarchive.com/search?q=service+manual (Try the Color Computer 3 Service Manual)

https://colorcomputerarchive.com/search?q=Laurence+Tepolt Assembly Language Programming (Try the end of the 1985 one, for hardware details)

https://colorcomputerarchive.com/search?q=Inside+OS-9+Level+II

http://wiki.yak.net/1087/Lomont_CoCoHardware.pdf

Early on, I archived a bunch of stuff here: http://wiki.yak.net/1087

My emulator and a bunch of other experimental stuff: https://github.com/strickyak/doing_os9/

My FROBIO tools for CocoIO network card: https://github.com/strickyak/frobio