Re: Apple //c--Uh-oh!

[buggie@mirac.unm.edu (stephen e buggie)]

                             BUGG-ROM IIC
                             ============


If your original IIc lacks the internal checkerboard self-test, and you
also want to make it compatible with the Unidisk 3.5 drive, then follow
Dave Althoff's example and UPGRADE it with "Bugg-Rom IIC."

Its a 28-pin ROM chip that you install on the IIc motherboard.  It
replaces the "Mon" ROM chip that is there now.  Two minor changes are made
on the motherboard.  As you read Dave Althoff, IT WORKS!  Easy to install
instruction sheet is included.

Price: $4.00 for one, $7.50 for two, shipping included. (Only one per IIc
is needed.)  But get a spare to upgrade the next IIc that you rescure from
a yard sale or thrift shop........


Steve Buggie
631 McKee Drive
Gallup NM 87301


P.S.  Maybe I'd better rename it something else than "Bugg-ROM."
      It is NOT a "buggy" ROM!      :-)







Dave Althoff (dalloff@freenet.columbus.oh.us) wrote:
: Earlier today, I (dalloff@freenet.columbus.oh.us) wrote:

: : Uh-oh!

: : I have a "ROM $FF" //c.  And it has been acting a little flaky.

: Well, thanks to Steve Buggie, it is now a ROM $00 //c, and it isn't flaky
: at all.

: : The net.wisdom was that I had one or more bad RAM chips.  Okay.

: : So, over the weekend, I carefully desoldered all eight of the main-bank
: : RAM chips, installed sockets, and replaced the RAM (well, I had to...I
: : damaged or destroyed most of the old chips getting them out...)

: : Trouble is, in extracting one of the RAMs, I managed to also destroy the
: : small yellow part, presumably a capacitor or diode, identified as "C8" on
: : the board.  8-(

: : Question:  What is this thing?  What value is it, so that I can replace it?

: Answer:  Several people have identified it as a bypass cap.  Thanks!  I
: have found that the system does work without it, though I should replace it.

: : As I am a brave person, I powered up the machine anyway.  No *BEEP*, but I
: : got a screen full of hi-res graphics that looks like a bunch of green and
: : purple "A"'s.  This is worse than the machine was before I started surgery.

: Well, my upgrade ROM arrived today.  So I wanted to hurry up and install
: it.  So I did, and I powered up the machine, and it worked fine.  So I put
: it back together, and it quite working.  I took it apart and it worked fine.

: Remember that I installed sockets for the RAM?  That raised one of the
: chips up just enough that the disk drive chassis shorted across the legs
: once the screws were installed. A well-placed chunk of electrical tape
: solved the problem.

: Thanks for all the advice!

: --Dave Althoff, ][.

: -- 
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