We were working in collaboration, details in the 6 page forum Pitou
started including two working designs.
I did several through-hold boards, probed them and A1 board to solve the
Cycle Steal mystery, then posted the KiCad files.
Please see:
https://forum.vcfed.org/index.php?threads/ibm-5110-ram-timings.1253087/post-1466675
for a photo of the through-hole board & parts that both Pitou and I
tested in 5110 machines.
I just added a photo of the kit showing the board & parts needed, easy
assembly.
Robert
On 9/22/25 2:08 AM, Christian Corti via cctalk wrote:
On Fri, 19 Sep 2025, Steve Lewis wrote:
Well, just yesterday I tested a set of RWS (RAM) replacement cards
for the
IBM 5110 from Patrick Lebbard from Canada - and I'm very impressed.
They
work well, I had them running for a few hours.
Details are described here:
https://voidstar.blog/ibm-5110-rws-ram-modern-make-replacements/
or VCF thread
https://forum.vcfed.org/index.php?threads/ibm-5110-ram-timings.1253087/
Interesting, I was thinking about replacing the RWS modules with two
standard 62256 SRAMs (plus 74180) for my systems that aren't maxed out.
But I would not consider any SMD stuff.
Christian
