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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

Josh: does your serial code do autobaud - i forget? If so it would probably be fine. ________________________________ Sent: April 30, 2021 5:45 AM To: [email protected] <[email protected]> Subject:

That's like 10% error.? So, 9600 baud becomes 10360 baud.? Should work... only 1 way to find out.

Good morning all, This is proving to be another hard to find component, so I got a 2MHz one instead. If I understood correctly there's a direct correlation with the terminal baud rate provided by the

Frank Palazzolo wrote: Q1 and Q4 (on the Z80MC Front Panel) are only needed for RS-232 serial. So they can be left out. :-) An N-channel MOSFET (like a 2N7000 or BS170) might work for Q2 and Q3.

Flavio Vinicius Spalato Zanchi wrote: These pre-biased transistors are handy parts. They save parts, and thus save space on the PCB. They are bipolar, and so are not susceptible to static damage, and

I built my kit to do TTL-serial only, and I don't plan to use real RS-232 voltage levels.? So I have a FJN3303R and a FJN4303R new in the package here. If you want them, contact me offline at

Flavio, I built my kit to do TTL-serial only, and I don't plan to use real RS-232 voltage levels. So I have a FJN3403 and a FJN4303 new in the package here. If you want them, contact me offline at

Lee, Many thanks for the reply. I'm absolutely sure that you and the community created the best design with what was available at the time. Once again I am out of luck. TME, being in Poland, and

flavio@... wrote: These "pre-biased" transistors with internal resistors have been around for decades, and there are hundreds of part numbers. When I designed them into the Z80MC, all the

yeah, certainly digikey Canada shows out of stock and obsolete.? hopefully lee has an alternate part or source.