Larry,
I'm in the process of updating the CRC65 homepage with compatible boards and daughterboards. Currently there are two I2C daughterboards: 1), a RTC prototype based on PCF8563 that provides time and 64Hz interrupts; 2), 128x64 OLED display readily available from eBay. The I2C interface can also drive pixel-addressable RGB LED based on WS2812B.
I am modifying several RC2014 boards for CRC65:
1. LED display board as described in Jan 26, 2021 post in this thread.
2. 65SPI board described here:
viewtopic.php?f=4&t=1265&start=90#p816483. I have looked into modifying VGARC for CRC65. In the process I'm reminded that VGARC used the 16-bit I/O addressing of Z80 which is a non-standard addressing method. To make it work with 6502, I need to make 4 cuts and 4 jumpers as well as changing the CPLD equations. In the near term, I will make the cuts and jumpers to check out the design, but long term solution is a new VGARC pc board specifically for CRC65.
4. I'm currently working on a slave 6502 processor for CRC65. Hopefully I have something to show this weekend.
5. Quad serial board may be another CRC65 compatible board with small modification.
https://www.retrobrewcomputers.org/doku ... mo:quadserI don't have Steve Cousin's SC129, but looking at SC129 schematic I think the digital output part should work. The digital input won't because 6502 does not have separate read strobe and write strobe. When you have CRC65 working, I can walk you through the process of getting SC129 working with CRC65.
ProtoRC3 should be a nice prototype board for CRC65, but CPLD can be a steep learning curve. I'm happy to give you a hand if you want to try CPLD design.
Bill
Edit: forgot to mention that a modified ALLCF board can plug into CRC65 to drive 320x240 LCD as described here:
viewtopic.php?f=4&t=6480&start=15#p81707There are lots of prototyping activities involving CRC65, but currently no production level pc boards that are compatible with CRC65.