Still looking for information on this card!
Renaissance Base Card
This card is an oddity, most "accelerator" or
"associate" processor adapters that fit into the MCA
slot depend on the host CPU to boot the system, then
hand over control to the associate CPU.
In this case, if you have installed the XTend
card -with- the CPU daughtercard, the XTend flex plugs
into the systemboard. You can remove ALL systemboard
memory as long as you use the XTend memory. Wow. This is
not the usual thing, where the PS/2 needs a minimal
amount of systemboard memory to run... BUT... The XTend
486SLC plugs into the systemboard socket...
I am guessing that the memory supported is 1, 2, and
4MB SIMMs. Remember,
the 50 was a 286 system- max addressable memory would be
Signetics 74F1762A FAST 74F1762 Memory Address
486SLC Daughter Card 8550 CPU "Flex Cable"
I have the tape "CPU flex cable" that fits
JP4. It extends
towards the rear of the adapter, where it connects to a
PLCC header that
fits into the 50 Type 1 board's CPU socket. The outline
above is the 8550 version, where the systemboard CPU
socket is in-line with the MCA slot. The 8560 flex is at
right angles to the XTend card.
From Frank Sawchuck
From Xtend's Utility Disk
Some of the older 286 PS/2 models may experience problems with some software due to the processor outrunning motherboard peripherals. If you are experiencing unusual behavior with your system, the following utility programs will help you identify whether the problem is speed-related by changing the speed of the 486SLC processor.
ARB.COM - slows down the
AdapterId 7FAE "XTEND Renaissance Expansion Board"
Onboard ROM Location