[rescue] EIO card in HP 4M

[Joshua D. Boyd]

> On Apr 12, 2021, at 10:34 PM, Mouse <mouse at Rodents-Montreal.ORG> wrote:
>
>
> I'm more concerned about VSIMM failures.  I've got only the one 8M
> VSIMM as far as I can recall, and only two (I think) 4M VSIMMs.  It's
> not for nothing that I included "[t]wo 8M VSIMMs" when outlining what
> could make a SS20 worth $200 to me elsewhere in this thread!

Given the amount of people recreating PCBs for old hardware (OpenTendo,
SnarkBarker, replacement motherboards), I wonder what it would take to make
replacement VSIMMS. I guess the first question would be what chips are on the
VSIMM.  Looking at photos online, it looks like there is a custom ASIC with
LSI branding, so I guess it would probably be pretty complicated to figure out
how to work around that.  I wonder if that or the RAM chips die more
frequently.  I also wonder if it would turn out to be feasible to upgrade 4MB
VSIMMS to 8MB.