LT6502b
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LT6502b progress
A lot has happened with LT6502b since my last post. Firstly the WiFi modem is now working, I finished the UART in a CPLD and it works a treat 🙂Secondly it’s now running at 10MHz, I can’t seem to get much above that, yet.Thirdly I’ve now added the nanoSwinSID chip onto the PCB and fitted the remaining keys. There are still a couple of things to sort; But I’m very happy with the progress. In regards the ModWires, one of these is no longer needed and the other was needed to signal to the CPLD when data is waiting to be sent from the KeyController/WiFi Modem, I’ve updated the Schematics…
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LT6502b
As much as I love my 6502 laptop, it felt a bit “chunky” at nearly 75mm deep and I really wanted a bigger screen as 9″ is a bit teeny. So I set about improving on that and the LT6502b project is underway, The main differences are; Things had been going very well; Compact flash working, console working, beeper working, 6522 VIA working and display working! Here is a 1024 x 600 Mandelbrot with 32 iterations, looks fabulous. Getting the screen working took the longest time, the new driver chip (RA8889) is way more complex than the previous RA8875 one, but was needed for the higher resolution/larger screen. That probably…