ggibeau@ucqais.uc.edu (AMOEBOID) (01/18/90)
This is to clear up some of the duplicate questions I have been getting
on the Kickstart ROM adapter card.
1) This card uses the Kickstart ROM, not EPROMS. If you use
Eproms, it takes 4 of the 27C512 at about $11.00/each, that is
$44.00 just for the Eproms vs. the $15 card + $4.00 for chips,
plus a kickstart ROM (1.2's can be had for free) and
2 PALs. We can post the CORRECT equations for the
PALs (the ones in the A1000 tech reference docs are incorrect).
2) This card is about 1.6" x 2.1" and will fit under the floppy
drive, with 4 Eproms, they will not always fit properly under
the drive housing.
3) By getting rid of the daughterboard, a lot of noise and
timing problems are cleared up. We have gotten machines running
with a hurricane and a Microbotics memory card, when the PAL grounding
alone would not clear up.
4) I guess I can post the entire article, since it has been pointed
out (numerous times :-)) that other hardware hacks have made the net rounds
before they actually saw print.
5) The parts needed are;
1 Kickstart ROM (either 1.2 or 1.3 or 1.4 :-) )
2 each 74F257's
2 each 74LS244's
1 PALEN (CBM part # 252128-01)
1 PALCAS (CBM part # 252128-02)
1 40 pin IC socket - (optional)
36 standoffs (we use gold posts)
all chips except ROM CAN come off of daughterboard (for all of
you with moths in your wallets - it is not a pretty sight) :-).
Time takes about 1.5 - 2 hours, and is minimal soldering. There are also
a couple of trace cuts that have to be made depending on the revision of the
motherboard.
User groups welcome for group discounts - this would make an ideal
hardware hack of the month (GRIN).
Regards,
those guys at UC (grin)
--
UUCP: ucqais.uc.edu!ggibeau BBS: (513) 721-7977 GT NODE: 006/005
US Snail-Dept of Biology ML 06, University of Cincinnati, Ohio 45221
Knock, Knock. Who's There? Cytidine Ribofuranosylcytosone. Cytidine
Ribofuranosylcytosone Who? Cytidine Ribofuranosylcytosone PHOSPHATE!monty@sagpd1.UUCP (Monty Saine) (01/18/90)
In article <2243@ucqais.uc.edu> ggibeau@ucqais.uc.edu (AMOEBOID) writes:
-This is to clear up some of the duplicate questions I have been getting
-on the Kickstart ROM adapter card.
-
-4) I guess I can post the entire article, since it has been pointed
^^^^
PLEASE!
Monty Saine