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PC6502 + Transputer
So, yeah, I have a thing for transputers, don’t ask me why, I don’t know. I’ve always been fascinated…. Anyway, I finally managed to get some reliable and repeatable comms between my 6502 tower and a T425 TRAM. Here you can see the data going out, and coming back in! In this case writing 0xEFBEADDE to address 0x80000000 (T425 internal RAM). Now this was supposed to be 0xDEADBEEF, but of course, the transputer is little endian.Anyway, output from BASIC program is below; I’ve tried this with the 4 TRAMs (Transputer Modules) I have and they all work!.Here is the tower with the link adapter and a single TRAM on top.…
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PC6502 update
I have been tinkering with various bits of the PC6502 computer system in between looking after Suzi (who is getting better slowly, but we still have a couple of months of hard work ahead of us). Previously I was able to show the OPL3 Sound and Speech card working, Here is an updated video of it playing a tune 🙂 Next I managed to get the display working, this is a 480×272 screen, it has built in fonts and a bunch of features line circle, line drawing and filling, so I can do a bunch of cool things as I go forward with it. I’ve not figured out how to…
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PC6502 Progress
In my previous blog entry I posted about the 6502 computer PCB I made, since then a lot of progress has been made. A lot. Firstly the timing issue has been overcome, the 6502 will now happily run at 14MHz (tested up to 17MHz), the issue was that the way I had implemented the logic in the CPLD for the FT245 serial port was messed up. My partner, Jayne, helped with that and found the issue. I’ve also added a whole bunch of different PCBs, so here’s a couple of pictures; So bottom to top; Aside from the Apple II slot everything is working a treat. Here is a demo…