Re: Apple ][c - garbage all over screen on boot

["Bill Garber" <willy46pa@comcast.net>]

"M. OMalley" <mooseNO_SPAM@SPAMmoveME.NOTto> wrote in message
news:d1r5c4$2ns4$1@news.wplus.net...
: My Apple ][c is playing up and has garbage all over the screen on boot-up,
: and it doesn't access the disk drive.
:
: I last used the machine about 18 months ago, and it worked fine back then.
:
: I've pulled the cover off and re-seated all the socketed chips several
: times, but the problems remain.
:
: If I press RESET a heap of times, sometimes I can see "App e" - part of
the
: "Apple ][" greeting - appear at the middle top of the screen.  So, this
: might mean that one or more of the EEPROMS is bad ??

Sounds more like a ram IC is bad. Have you run the self-test?

: An ancient Apple ][ Repair Guide lists my problem "system won't boot,
power
: light on, drive won't run, garbage on screen" and suggests that I need to
: replace EF ROM (monitor) at E10 and/or 6502B (cpu) at C4.  Out of these,
I'd
: say the EF ROM is bad - rather than the CPU.  Does this sound right to you
: guys ?

EF ROM would be an earlier IIe not the enhanced board
from 1986. IIc has but one rom up in the front-middle.
Could be the CPU, but I'd suspect something else at this
point in time.

: Any idea how to fix / get replacement parts ?

Unless you like messing with it, I'd suggest a trade with me
for a good working IIc. What is the model number on the bottom
of the case.

: Also, anyone got any scans of the schematics for an Apple ][c ?

I believe I do have them. Send me an email and I'll forward them
to you right away.

: Also, are Apple ][c ROMS/PROMS comtatible with Apple ][+ ROMS/PROMS ?

IIc ROMs are not compatible with any other Apple II.

: In 1983, I replaced an EPROM in my old Apple ][+ clone - to get "Apple ]["
: to display instead of "Computer", and I still have this chip around
: somewhere.  I have no idea if this chip still works.  But, is this the EF
: ROM (monitor) chip ?  Would this Apple][+ chip be compatible with a
: Apple ][c ?   (I'm betting that this tack is too flimsy to have any hope
of
: success).

Again, the IIc is a single eprom containing all of the ROM
except keyboard and chargen. II and II+ have D0, D8, E0, E8,
F0, and F8. Usually IIs can get away without D0 and D8, where
the II+ has a different F8 that has autostart firmware.

: Anyway, any information much appreciated, TIA,

Best way I can help is to trade for a good one, or
offer to repair it for you, unless as I said, you
like to mess with it.

Good Luck,

Apple II Forever, Apple II Together
Bill @ GarberStreet Enterprizez
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