conte@uicsrd.csrd.uiuc.edu (11/02/87)
I have been thinking about the 32K upgrade for the 28C that Educalc
offers, however looking at the August issue of HP Journal, I can't
see any room for an additional IC on the circuit board, or for one
piggybacked, since there seems to be no clearance in the case. Would
someone who has the upgrade describe to me exactly what would happen
to my calculator if I sent in the $$? Am I going to end up with a
wart on the back of it?
Tom Conte Center for Supercomputing Research & Development
University of Illinois
The opinions expressed are my own, just mine, not the Center's, not Cedar's...
uucp: ...!uiucdcs!uicsrd!conte bitnet: conte@uicsrd.csrd.uiuc.edu
arpanet: conte@uicsrd.csrd.uiuc.edubmaraldo@watdcsu.UUCP (11/06/87)
This describes the EduCalc memory upgrade for the 28C:
Cut a hole in the back of the 28C: Reason: The 28C is heatstaked
shut (which means they are completely sealed). Then they connect a
memory board from an HP71 memory upgrade module to the HP28C
motherboard: Reason: The 28C uses a modified 71 processor, hence the
buss is the same (10 pins!). Then they insulate the board, stuff it
into the body and seal the hole with a rubber plug which extends
50/1000 inch from the back surface. Price: $270 for 32K, and
$180 for 4K. One could simply buy a 71 32K module from Educalc ($150)
and mount it theselves (being VERY careful when cutting the hole,
especially if they are using a Dremel MotoTool).
Brett L Maraldo
p.s. anyone have any info on the pinout locations of the buss?
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