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Re: W6502SBC, a simple 6502 sbc
Posted: Tue Sep 06, 2022 6:47 am
by willie68
Thanks for the hints.
@BigEd
Yeah, i know, thats why i ordered a bunch of 6551, but I hoped to find at least one good one. But 100% scrap is a bit high...
@floobydust
The problem with utsource here in Germany is that the shipping costs are way too high.
€26.96 (that's almost the same in $ at the moment) It's a hobby, but ten times the value of the goods as postage...
I actually wanted a WDC W65C51, but it is currently not available here in Germany. Therefore the detour via the China goods. I've now ordered a couple of MAX3100's from a local supplier, should arrive today or tomorrow. Let's see how they do.
But that's also what makes it so exciting. You never know what you'll get...
Re: W6502SBC, a simple 6502 sbc
Posted: Mon Sep 12, 2022 12:40 am
by GARTHWILSON
- Rarely will you get a 65(C)51 to run much higher than the rated speed (note: I only run mine with interrupt-driven receive and transmit).
Re: W6502SBC, a simple 6502 sbc
Posted: Mon Sep 12, 2022 8:39 am
by willie68
Just ordered a W65C51 in PLCC package and an adapter for it.
Just in case.
The MAX3100 variant is now on the breadboard, got my first try with arduino, because of checking the schematics. Working.
Re: W6502SBC, a simple 6502 sbc
Posted: Mon Sep 12, 2022 1:18 pm
by floobydust
Just remember that the W65C51 has the xmit bit defect, which includes the DIP and PLCC versions:
viewtopic.php?f=4&t=2543&start=30#p29001
Also note that the latest WDC parts require a 1Meg resistor in parallel with the crystal to oscillate.
Re: W6502SBC, a simple 6502 sbc
Posted: Sat Oct 01, 2022 1:08 pm
by willie68
Adapter time,
PCB have come and seems to work.
Re: W6502SBC, a simple 6502 sbc
Posted: Sat Oct 01, 2022 6:31 pm
by GARTHWILSON
Nice! Can you give a link to those pins. Interplex NAS has some nice pins for this kind of application but I just looked into them for a work project and found that because they have so many combinations of options, they don't want to stock them or even start up the machines to make them until you order, and minimum order was tens of thousands of dollars, non-returnable and non-cancelable! We had to find a different way to do the job.
Re: W6502SBC, a simple 6502 sbc
Posted: Sun Oct 02, 2022 7:54 am
by willie68
Sure, this are Pin strip RM 2.54mm, straight, 1-row, 36-pin with round contacts 0.5mm.
https://www.reichelt.de/stiftleiste-rm- ... tml?&nbc=1
Its my favorite distributor for my personal use.
Here is the datasheet:
https://www.reichelt.de/index.html?ACTI ... _DB-DE.pdf
Re: W6502SBC, a simple 6502 sbc
Posted: Wed Nov 02, 2022 3:26 pm
by willie68
Next big step done:
implementing 6551 transmit/receive and a extended version of wozmon:
https://hackaday.io/project/186414-w650 ... 5c51-die-2
Mow the next evolution is coming, a simple basic...