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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

Zanchius wrote: That will work. 1.8432 MHz hits 9600 baud exactly. The 1.80 MHz resonator is actually 2.4% low (but it works anyway). Lee -- A designer knows he has achieved perfection not when

Zanchius wrote: Hi Flavio, Download the EPROM source file at <http://sunrise-ev.com/photos/z80/ZMCv15.zip> from the website at <http://sunrise-ev.com/z80.htm>. In the .ASM or .LST file, search for

bill rowe wrote: No; it doesn't autobaud. But there are two serial ports; one on the Z80-CPU board, and another on the Z80-SIO board. The one on the CPU board uses the 4 MHz resonator; so it will

Humm ... This adds another gremlin in the equation. I'm starting to regret ordering only the PCBs. But hey, there isn't any fun without problems to solve. I may have a handful of 1.8432MHz crystal

A 10% error is really too big, for serial communications.? It miiiight still work, but I strongly doubt it, because by the time you get to the end of the character (10 bits in - start, 8-data, stop),

Hi Lee, I would be comfortable in flipping a byte or two on the EPROM image, I managed to find a programmer that can burn 27256 chips so that also wouldn't be an issue. May I ask which bytes should

Zanchius wrote: Hi Flavio, Yes, I'm having trouble getting the 1.8 MHz resonators as well. Mouser quit carrying them, so I bought my last batch from Tayda2009 on ebay. But they seem to have gone out