tcdev
24th March 2009, 02:14 AM
I've revisited Gary Becker's Coco3FPGA, since he has released a new version. I've also obtained an updated revision of the 'P2' (custom) hardware platform - hereafter referred to as 'P2A' - which has byte-enables on the SRAM. This means supporting Coco3FPGA is much easier.
As a result, I've managed to get Coco3FPGA running on the P2A and DE2 targets. DE1 doesn't have enough on-chip RAM - it would be possible to run all the Coco3 ROMs out of flash on that target, but it's not something high on my list of priorities.
Haven't done much testing as yet - but it boots to the ECB/DECB prompt. Testing of Gary's serial disk emulation is WIP atm.
There was a problem with Gary's PS/2 controller - he's reading the PS/2 data off the wrong clock edge, which probably explains the problems he has reported running the controller at anything below 1MHz. I fixed it and it works for me - haven't done any further experimentation with slower clock rates (there's no point really).
A few extensions in the pipeline - once I get the serial disk emulation working I'd like to hook up a Gamecube controller to the analogue joystick ports - that should be reasonably straightforward I hope. Next I might re-instate the original DECB ROM and try hooking up the WD179x controller from the Model I project.
As a result, I've managed to get Coco3FPGA running on the P2A and DE2 targets. DE1 doesn't have enough on-chip RAM - it would be possible to run all the Coco3 ROMs out of flash on that target, but it's not something high on my list of priorities.
Haven't done much testing as yet - but it boots to the ECB/DECB prompt. Testing of Gary's serial disk emulation is WIP atm.
There was a problem with Gary's PS/2 controller - he's reading the PS/2 data off the wrong clock edge, which probably explains the problems he has reported running the controller at anything below 1MHz. I fixed it and it works for me - haven't done any further experimentation with slower clock rates (there's no point really).
A few extensions in the pipeline - once I get the serial disk emulation working I'd like to hook up a Gamecube controller to the analogue joystick ports - that should be reasonably straightforward I hope. Next I might re-instate the original DECB ROM and try hooking up the WD179x controller from the Model I project.