Apple IIgs ROM 03 system bad error

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Verault's picture
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Apple IIgs ROM 03 system bad error

I have two ROM 03 Apple IIgs systems that gives  error "SYSTEM BAD 06010000" When I run the built in Diagnostics. From what I looked up it seems to be an issue with the built in SERIAL IC on the main board.Is that correct or is the issue something else? IF I disable the modem port in the control panel and add a super serial card will the system work as intended sans the on-board serial components? Would that create a functioning machine? I guess they had inherent issues with the serial chips.  I have tried a brand new Zilog SCC (in fact I tried two different IC's) and it still gives the error "SYSTEM BAD 06010000", gone down to many dead ends with this board. Anyone else have ideas?Could the 3.686400 Crystal at Y2 directly beside the Zilog SCC chip be suspect?Would appreciate the feedback,

Verault's picture
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Anyone? Anyone at all? I dont

Anyone? Anyone at all? I dont want to throw away a Rom 3 board!

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I googled

and found this:

http://www.verycomputer.com/20_35e9d2d083a648b3_1.htm

Don't know if that helps you.

 

Among other things the site says:

From the technical note (TN.IIGS.095):

Self Test 6: Serial Test

AA =    06:

BB =    01:  Register R/W

        04:  Tx Buffer empty status

        05:  Tx Buffer empty failure

        06:  All Sent Status fail

        07:  Rx Char available

        08:  Bad data

Thus it is getting register read/write errors trying to talk to theserial chip.

This could indicate a problem with the serial chip itself, orelsewhere on the motherboard (the latter is more likely if you aregetting other problems).

Have you tried removing ALL cards (including the memory card andaccelerator, if any), and repeating the self-test?  It could be afaulty card causing problems.

 

and

 

Faulty cap in the serial port hardware. Or try reseating all the chips onthe motherboard, and cards. Or, it could be a diode (hehe).

Get a DMM (Digital Multimeter). Preferably made by Fluke.Set it for Ohms testing. After you have unpluged your computer check allthe caps around the serial port hardware. It is prabobly in some noisefilter circuitry. If the Ohms meter stays around 10ohms or less you have ashorted cap. Replace it.

Diode checks are harder since you have to check them while in thecircuit. But a shorted or open one is generally easy to find.

 

 

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All the caps are new. You

All the caps are new. You only get the error when running diagnostics. This is the 3rd serial chip I have tried so I really dont believe the issue is the scc chip.

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