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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.

Hi Josh, Unfortunately at least in their UK branches they are both not available and marked as obsolete. I've also looked at Farnell with the same result. alltransistors.com gives a list of

Hi, I thought Lee included part numbers and sources in the parts list.? I think Digikey probably has these, or Mouser? Cheers, Josh

Hi there, I am sourcing the components for the Z80MC, which have brought me to a halt trying to find the pre-biased transistors Q1-Q5 used on the front panel (FJN3303R, FJN4303R) and even their

I have a multi processor using the SC/MP both the first 8A500 pmos then later 8073. I have a board I made up with the Nibble basic rom version too.??Their basic issue was paged the unique 12bit

Hi Allison: Thanks for taking the time to explain some of the past design issues and your involvement with them. Yea, lots of timing and bottle-neck issues for access to resources. Integrated circuit

Scott, Like many of the time performance a was a thing... Exity was only one and that was later.? IN 1980 I setup to make the meanest z80 system I could using 6mhz Z80s that were appearing.? Basic

Hi Bill, Yes it all fits together. There is a problem with the FP on top of the SIO though that I haven't tracked down. The FP works fine but there is a segment 'e' I think it is, that is not lit on

If speed is an issue, there is always this route... https://hackaday.com/2019/12/10/laptop-like-its-1979-with-a-16-core-z80-on-an-fpga/ Peace and blessings, Scott

Yes, that is the case.? My Kaypro4/84 has a 1mb ramdisk, very fast. The compupro also has a 512K ram disk and hard disks with smart controller, faster even at only 4mhz z80. AT class machines even

Allison,?? Lee's ALTAID computer uses a 512K RAM chip, 64K for a full memory map and 448K for a single RAM disk.It's fast to access the disk, but the 8080 itself is just chugging along at