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Wow Allison I read your use of the z80. Its so cool to read that, as well as the fact that its still running for that processor. Im already hooked onto it. Yea I was a 6502 guy from way back and still

Dynamic ram refresh is in all the Z80 flavor s (Z80, Z180,Z280...). I have a paper done by Tim Olmstead on how to use refresh and make it work.? ?I'll have to put that in the files area. FYI the

saturn5tony via groups.io wrote: I too still have all my old Byte, Dr.Dobbs, REMark, Sextant, QST, etc. magazines, and often go on "archeological digs" for information and entertainment. I recently

Z80, Been developing and using the Z80 since I got my Northstar Z80 cpu for Altair in early 1977 at that time a 4mhz part or easily twice the 8080 speed. I have not less than... 5 Z80 s100 systems 3

Hi Lee, Wow cool list of things to keep in mind. I did not know about dyno-ram refresh ability. I am still going threw the docs and filling up my parts list for the Z80MC. Wow a really awesome design

joshbensadon via groups.io wrote: The Z80 was amazing in part because it was such an early microprocessor. It was a huge step ahead of its contemporaries (like the 8080, 6502, 6800, etc.) The others

Hi Josh (and Bill) Oh so true about looking at old Bytes and PE. I have been reading them every day for quite a few years now, as well as RE. Its fun to see where we are now compared to the late 70's,

Even if you don't have the brain power to concentrate on this stuff, the books are still fun to read as they demonstrate examples.? A few times, I would hang out with my friend Walter, and we would

You can find a lot of them as PDF files on archive.org, along with a lot of the other classic computer & programming books. Zak's, Osbourne, and others,? tech manuals from the manufacturers, etc. I

Hi Josh, I dont remember that instruction, but I know it had quite a few more that were better than the old 8080 as well as an improved register set. I know that the HW took the 3 power supplies from

You can only truly appreciate the Z80 when you start using the Repetitive Copy and Compare instructions.? With a single instruction, you can move a block of 64K as fast as the memory read/write

Hi Josh, Thank you so much for approving me. Yea, I did not really do enough with that processor years ago (so much changed afterwards as I am sure you all know) but I did see how many systems were

Hi Tony, Good luck on your Z80MC build.? The "zed 80" was quite a successful processor.? It's line up of peripheral chips made it very much a dream machine.? The fact that it had all these great

Sorry for the silly joke above. Yea hello guys! Yup.. a new Z80 freak here, lol. Not really a user of the zed 80 other than having a Microsoft Z80 card (that I still have) in my Apple IIe.

Thank you Josh, this is very useful. Flavio [email protected]> wrote:

The 8250 has a coarse divider for baud rate.? 12 works to divide 1,843,200 to 9600 baud because 1843200 / 12 / 16 = 9600 The next divider number is 13 and to get 9600 at that value you would

No, it is very tight on timing so that it can do full duplex bit bang.? But that runs on the 4Mhz Z80.? The 1.8Mhz is for the UART.

You could cheat and just use the original part: https://www.taydaelectronics.com/ceramic-resonator-1-80mhz-3-pins.html You'll probably have to wait a few weeks, however :-{.

You can order direct from Tayda Electronics, and they *are* stocked (3,988,888 parts claimed). https://www.taydaelectronics.com/ceramic-resonator-1-80mhz-3-pins.html

Lee, That's brilliant! Thank you for the information. And thank you everyone for your help as well. Now the wait for the boards to arrive... (+_+) Flavio