| Electronics > Projects, Designs, and Technical Stuff |
| Found a weird old computer dumpster diving. (z80?) |
| << < (10/10) |
| greenpossum:
--- Quote from: tsvisimcha on March 30, 2020, 04:00:50 pm ---Will this work? https://m.aliexpress.com/item/32951386262.html?pid=808_0000_0101&spm=a2g0n.search-amp.list.32951386262&aff_trace_key=&aff_platform=msite&m_page_id=7316amp-6U1iuuFAU6RA7PUPX_omKQ1585583972595&browser_id=e9767940aded429aa2f1e4fb52beaf99&is_c=Y --- End quote --- It's a clone of this: https://www.microchip.com/Developmenttools/ProductDetails/PG164130 for programming PIC chips, not EEPROMs. TL866s start at around $50. If you don't want to spend that money, EEPROMs can be programmed with simpler circuitry with a Arduino. Something like this: https://github.com/beneater/eeprom-programmer or many others that a search will get you. Those designs will also allow you to read an *EPROM. But a TL866 is handy for later too. |
| rstofer:
--- Quote from: T3sl4co1l on March 30, 2020, 06:55:25 am ---Also easy to find if it's only ever done with the 0x21 byte. Tim --- End quote --- I know that any 3 byte instruction (LXI H, LXI B, LXI D, LDA, STA and others that don't come quickly to mind) will work. I don't see why 2 byte instructions wouldn't do the same. In any event, it's something to look for if the disassembly seems to go off the rails. |
| TomS_:
--- Quote from: tsvisimcha on March 28, 2020, 07:24:18 pm ---What kind of chips am I going to need to get if I want to build a CP/M machine? --- End quote --- You might not be able to do it without significant modification. CP/M wants RAM to start from address 0, but the Z80 starts executing from address 0, so you have to do tricks to swap ROM and RAM after boot. Might not to worth it on a board like this if it was purpose built for some other application. Otherwise there have been several Z80 machines built to run CP/M in recent times. Things like RC2014 can do it, there was a system by Sergey Kiselev and/or Grant Searle that could also do it. You might get some ideas of what you need from those systems. |
| Ian.M:
Its reasonably easy* to make a daughterboard to fit in the Z80 socket, carrying the Z80, extra RAM and logic to remap the memory map to something CP/M compatible, but unless the I/O facilities on the DYONICS PS3500EP board are particularly spectacular and useful, it just isn't worth it - you might as well just rob it for chips to build your own no compromises Z80 SBC. * assuming you are familiar with PCB design and comfortable ordering PCBs online, or alternatively are a demon at complex protoboard construction. |
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