In all the time I’ve been developing Floppy Emu, can you believe I’ve never had a debugger? I use the Atmel AVRISP mkII to program the Emu’s ATMEGA1284 microcontroller, but the mkII only supports programming and not debugging. I don’t…
I’ve been pondering what a redesigned Floppy Emu might look like – what ICs might be involved. So why mess with success? The current design combines a microcontroller with a CPLD, which has proven to be a powerful and flexible…
I’m beginning to suspect there’s something subtly wrong with my Apple IIe, which might explain a lot of strange intermittent errors I’ve recently observed with Yellowstone and Floppy Emu development. It’s hard to know what to conclude, but when you…
Displays, displays! I’ve built a prototype Floppy Emu board that uses a 1.3-inch 128×64 OLED display, instead of the existing 1.4-inch 84×48 LCD. It works, and it looks very nice. So is this the answer to my display worries? Take…
Last week I wrote about my troubles with the Nokia 5110 LCD used by Floppy Emu, with a discussion of possible replacements. There was no clearly obvious alternative, as most of the options were too big, too small, too expensive,…
I did some surgery on the Yellowstone board, in an attempt to address major problems with power supply noise and data bus overshoot, previously discussed in Apple II Card Electrical Woes and Yellowstone Arrgh. I replaced the 74LVC245 that drives…
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