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…
Floppy Emu uses an 84×48 graphical LCD display. It’s just a low-resolution 1-bit display, but it’s fast and easy to use, and has a nice built-in backlight. The display is actually a clone of the old Nokia 5110 phone display,…
I’m still struggling with these Yellowstone card electrical problems, but getting nowhere. Very frustrating. I’ve focused my attention on the large amount of overshoot on the data bus, and the power supply fluctuations, under the theory that minimizing those will…
The digital abstraction of zeroes and ones is lovely, but electronics debugging often requires a deeper look into the realm of analog signals. That’s the story of my Yellowstone FPGA-based disk controller for Apple II, and it’s slowly driving me…
Want to add new features to your old Mac? The Mac ROM-inator II hardware for vintage Macintosh is on sale at a special price for a limited time. The ROM-inator II SIMM replaces the stock Macintosh IIx, IIcx, IIci, IIfx,…
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