This is really cool. Initially from the photo I thought it was just a big FPGA emulating an 8086, but then I saw the chunky DIP chips on the other end. The TP3

This is really cool. Initially from the photo I thought it was just a big FPGA emulating an 8086, but then I saw the chunky DIP chips on the other end. The TP3465 SPI chip mentioned sounds useful — I've been building a single-board 6502 which is CPU bit-banging SPI at 1 MHz, and takes about a minute to fill a small 16-bit color screen. I've wanted to offload that to an SPI chip, but hadn't found any. The downside; the TP3465 chips are about $11 each on Mouser, and don't come in hand-solder-friendly packages. I mostly came here to write that I'm puzzled by “reasons I shouldn’t need to explain” here, though: > In terms of disclosure of what is inside this CPLD – [...] Its final design is now almost entirely VHDL. If there’s sufficient interest I’ll do a good diagram of it at some point, but for reasons I shouldn’t need to explain, I won’t be providing the full source for it just yet. I could only guess, from most to least likely; (a) it contains proprietary IP that is being used without a license, (b) he considers it too messy to release, (c) he just doesn't want to, or (c) he wants to retain the ability to license his creation.