@7FAE.ADF XTEND Renaissance Expansion Board - CPU Upgr.
C7FAE.ADF Init file for @7FAE.ADF
Renaisance Utility Disk
Still looking for information on this card!
Renaissance Base Card
JP1-JP4 Receptacles for daughtercard headers
JP5-JP7 72-pin SIMM sockets
U20 IDT 6116
U23 Signetics 74F1762A
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 planar. You can remove ALL planar
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 planar memory to run... BUT... The XTend
486SLC plugs into the planar 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 16MB.
Signetics 74F1762A FAST 74F1762 Memory Address Multiplexer
486SLC Daughter Card
8550 CPU "Flex Cable"
JP1-JP3, JP5 Headers to Base
JP4 60-pin header to flex cable
U13, U14 BIOS?
U19 TI TX486SLC (25MHz?)
U24 68-pin PLCC socket (Co-pro?)
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 planar CPU
socket is in-line with the MCA slot. The 8560 flex is at right angles to the
From Frank Sawchuck:
The XTend card works with the 16 bit bus of the Model 50Z, but it
also doubles as a 16 bit memory only card or a 32 bit memory only card with the
486 daughter card removed The 486 upgrade CPU complex is a optional XTend
daughter card for the main XTend board. I hope that I'm making sense, anyway it
is a card that I've used in the 50Z as a CPU / memory upgrade and on 386 and
486 IBM models as a memory only upgrade card.
From Xtend's Utility Disk
The Renaissance System upgrade significantly accelerates the CPU functions,
including accesses to main memory and to the motherboard resources (unlike
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 processor's cache
OFF.COM - turns off the processor's cache
ON.COM - turns the cache back on (it is always on after boot-up)
ENSRVR.COM - run this before running the Novell SERVER
AdapterId 7FAE "XTEND Renaissance Expansion Board"
Onboard ROM Location
Renaissance CPU upgrade installed, <Segment C000>
No Renaissance CPU installed, <ROM Disabled>.
C000-C1FF>, Segment C800-C9FF, Segment
D000-D1FF, Segment D800-D9FF, ROM Disabled