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Author Topic: ft245 (232 or 2232 in 245 mode) interface to 68000 bus?  (Read 52 times)

mc68000

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ft245 (232 or 2232 in 245 mode) interface to 68000 bus?
« on: November 03, 2019, 12:45:38 PM »

Anyone have advice, or an example schematic connecting the 8 bit data bus end of an ft245 as an I/O device to a M68000? (or 6502 for that matter.)

I'm particularly interested in what buffering and what handshake signals, signalling DTACK and IRQ, would be needed, and using whatever modes would enable bi-directional buffering transfers rather than just bitbang and at the highest data rate possible.

This would be to allow me to connect a modern USB computer to an older 68k machine and be able transfer data back and forth.

I realize that on the 68k side I'd need some tri-state logic to detect the I/O address and enable the 68k data bus lines, as well as 5v<->3.3 conversion, but I'm less sure about the handshaking logic to the ft245 side. Ideally I'd like to be to write code on the 68k side to MOVEP bytes in a loop, one at a time, in or out and not potentially lose them. That is to use the internal buffer that the ft245 chips do, so on the modern PC side I could use the driver and read the same byte stream sent by the 68k or write a stream of bytes and have it delivered to the 68k side.

Thanks.
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