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The instructions are read by a low-speed TTL computer they build. Specifically, it should be reasonably priced, reliable, easily available and likely to remain so. It doesn’t need to be pin-compatible, although that would be nice.
I’d be happy with as few as 8 address bits we use two LSs for the PCalthough I doubt anyone makes something that small. I also don’t care about speed. Robustness to student wiring mistakes would be great. Would the 28C family be a good place to look? This question appears to be off-topic. The users who voted to close gave this specific reason: Instead, describe your situation and the specific problem you’re trying to solve.
You didn’t say which package you are using, I assuming it is a pin DIP. There is also a 8Kx8 version of the same chip with a compatible pinout unused address lines are no connects. It is a little cheaper in price, and also in stock.
One more comment in the form of an actual answer: You could also try Jameco. There are still a few parallel flash chips available in DIP, e. They tend to be higher capacity than eeprom devices, so more address lines to tie but otherwise equivalent to eeprom for your purposes.
Home Questions Tags Users Unanswered. I’ve been using the pin DIP package.
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Ellen Spertus 2 9 Not an ‘answer’ per se, just an opinion: I don’t think you’re doing your students any favors by getting them to build stuff out of series TTL in this day and age. JohnMiles, could you elaborate? The goal of my course, which is the introductory and only architecture course at a liberal arts college, is for students to understand all the way down to the gate level how computers work, not to directly prepare them for industry. I hope to inspire some to grad school.
I find the hands-on work, including the debugging, to really get this information across to all levels of students. Could you let me know why you think a FPGA approach would be better and point me to any educational material?
I don’t have experience with FPGAs. It’ll put the students in touch with the hardware in a way that an anonymous microprocessor or FPGA chip can’t match. However, it struck me that you must be spending a lot of time getting them to the point where they understand what they’re hooking up, and why. Perhaps the limited available time could be used more productively with modern hardware.
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Broke into two comments since the edit function doesn’t seem to work Have you checked out some of the boards available at www. I like the Nexys2, personally, and the books by Haskell and Hanna look pretty good for bringing newbies up to speed. I believe the 29Cxxx series is now mostly flash memory.
I’ve never used the 28C family. Can you tell me anything about it? John Miles 3 5.