When I was experimenting with serial a few years ago I noticed that floppy port IO definitely impacted serial IO. I'm surprised a RAM disk didn't help. Was everything on the RAM disk? E.g you app and the system fill too?
I think it's more of a personal challenge of "can I make this work" and/or nostalgia. I know when I played around with ARA + serial + Basilisk II as an internet gateway it was the first category. Looking at websites rendered in Mosaic for me, falls into the second.
There are TA articles: TA29125, and TA43009 from Apple that discusses Maximum Speed for Serial ports, you may find them interesting if you haven't read them already.
Only thing I found was Version 1 on a Software of the Month Club August 1995 CD-ROM. The only other thing I can think to do would be to see if Mark C Smith is on LinkedIn. I just sent a note to a Mark Smith who went to U of M from 1990 to 1996 and did software development for Netscape and Aol...
You could try the newlife drivers, both newlife and Novy seemed to use a lot of the same drivers. https://www.savagetaylor.com/2023/01/17/68k-accelerators-newlife-computer-corporation/
I assume you tried the Novy Railgun drivers? https://vintageapple.org/macdrivers/accel.shtml
Does anyone have, or know about the Abaton Multitalk?
I was going through the TIL articles and found: TIL04140: MultiTalk: No Longer Available for AppleTalk Network
MultiTalk lets AppleTalk network users share serial devices. It has four mini-circular-8 connectors: one for AppleTalk (RS-422)...
Having difficulty finding this, plenty of adapters with the GRD and +5volt pins flipped from what you have. I thought I had found what I needed on amazon, the icon in the product pictures was correct, but when it arrived the actual product had the icon below.... Trying to figure out the right...
On further testing this is not a 100% solution (wiped volume), sometimes it works, sometimes it doesn't.
My plan now is to setup an basic 8.1 installation on my 32GB CF card and create an image of that card for myself, and others if they want it.
For whatever reason a 100% working approach for...
I have the later card 820-0745-A from 1995 with a 60 pin connector that I'm trying to find information about. I also have the 820-0567-A card from 1994. So far all I've found is mention of the 661-0159 being replaced by the 661-1073 card on page 80 of the Apple Service Guide Volume 4.
Success! @AndiS, @360alaska, @jeremywork
Just did a test, did a full erase (erase, plus Burn 2.5) of a volume that previously had a non-working installation of 8.1 + PCsetup, then a new install.... PCsetup worked!
Erased the volume
Ran Burn 2.5 on the volume (Burn 2.5 is also on my System 7.5.5...
So I was playing with this again using @jeremywork's image as a starting point. I've discovered something odd:
If I copy the working system folder from jeremy's image to a "new" blank drive image it works, but if I copy the system folder from jeremy's image to a drive image that previously had...
Looks like the company also made a PCI to Nubus bridge, and there was a requirement for 32-bit clean applications.
The closest thing I found to a technical note so far is:
7.2.1.4 PAL DEVICE. A 16L8 PAL is used to generate chip select signals to the DDLC and '374 address expansion register. The...