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Apple IIgs ROM3 [message #341027] Mon, 03 April 2017 17:19 Go to next message
Anonymous
Karma:
Originally posted by: john goodwll

I just found an Apple IIGS ROM3. Well it doesn't work, when I power it up it chimes but garbage appears on the screen. When I power it on with OPTION, Open apple it does seft test and it give System Bad: 02E02000! Does anyone know what that means? Is this GS toast?

thanks

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Re: Apple IIgs ROM3 [message #341039 is a reply to message #341027] Mon, 03 April 2017 19:20 Go to previous messageGo to next message
Polymorph is currently offline  Polymorph
Messages: 206
Registered: October 2012
Karma: 0
Senior Member
On Tuesday, April 4, 2017 at 7:19:04 AM UTC+10, john goodwll wrote:
> I just found an Apple IIGS ROM3. Well it doesn't work, when I power it up it chimes but garbage appears on the screen. When I power it on with OPTION, Open apple it does seft test and it give System Bad: 02E02000! Does anyone know what that means? Is this GS toast?
>
> thanks

Hi John,

the error code you have referenced is telling you that you have a bad RAM chip in bank E0. See here for full details:
https://archive.org/stream/IIgs_2523095_Diagnostics/IIgs_252 3095_Diagnostics_djvu.txt

Unfortunately, IIgs ROM 03 RAM is soldered, so the defective chip(s) will need to be identified, desoldered, and replaced with new chips.

When the IIgs is turned on, do any of the RAM chips feel hot? It is pretty common for failed RAM to short internally and get hot.

Hope this helps,
Mike

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Re: Apple IIgs ROM3 [message #341045 is a reply to message #341039] Mon, 03 April 2017 20:50 Go to previous messageGo to next message
Anonymous
Karma:
Originally posted by: john goodwll

On Monday, April 3, 2017 at 7:20:29 PM UTC-4, Polymorph wrote:
> On Tuesday, April 4, 2017 at 7:19:04 AM UTC+10, john goodwll wrote:
>> I just found an Apple IIGS ROM3. Well it doesn't work, when I power it up it chimes but garbage appears on the screen. When I power it on with OPTION, Open apple it does seft test and it give System Bad: 02E02000! Does anyone know what that means? Is this GS toast?
>>
>> thanks
>
> Hi John,
>
> the error code you have referenced is telling you that you have a bad RAM chip in bank E0. See here for full details:
> https://archive.org/stream/IIgs_2523095_Diagnostics/IIgs_252 3095_Diagnostics_djvu.txt
>
> Unfortunately, IIgs ROM 03 RAM is soldered, so the defective chip(s) will need to be identified, desoldered, and replaced with new chips.
>
> When the IIgs is turned on, do any of the RAM chips feel hot? It is pretty common for failed RAM to short internally and get hot.
>
> Hope this helps,
> Mike

None of the chips get hot/or warm! Would this be fast or slow ram?

thanks

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Re: Apple IIgs ROM3 [message #341054 is a reply to message #341045] Mon, 03 April 2017 21:51 Go to previous messageGo to next message
Antoine Vignau is currently offline  Antoine Vignau
Messages: 1860
Registered: October 2012
Karma: 0
Senior Member
This is slow RAM, John.

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Re: Apple IIgs ROM3 [message #341055 is a reply to message #341054] Mon, 03 April 2017 22:00 Go to previous messageGo to next message
Anonymous
Karma:
Originally posted by: john goodwll

On Monday, April 3, 2017 at 9:51:47 PM UTC-4, Antoine Vignau wrote:
> This is slow RAM, John.

thanks can I use HY53C464S-10 to replace those chips? seems to have same pinout and are 64X4!

thanks

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Re: Apple IIgs ROM3 [message #341259 is a reply to message #341055] Thu, 06 April 2017 18:11 Go to previous messageGo to next message
Anonymous
Karma:
Originally posted by: john goodwll

On Monday, April 3, 2017 at 10:00:41 PM UTC-4, john goodwll wrote:
> On Monday, April 3, 2017 at 9:51:47 PM UTC-4, Antoine Vignau wrote:
>> This is slow RAM, John.
>
> thanks can I use HY53C464S-10 to replace those chips? seems to have same pinout and are 64X4!
>
> thanks

Good news, I just replaced the 4 slow ram chips and the Apple IIGS came back to life!! thanks guys!

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Re: Apple IIgs ROM3 [message #341266 is a reply to message #341259] Thu, 06 April 2017 20:06 Go to previous messageGo to next message
Polymorph is currently offline  Polymorph
Messages: 206
Registered: October 2012
Karma: 0
Senior Member
Congrats on getting the IIgs up and running again! It's a great feeling bringing old things back to life isn't it? :-)

Cheers,
Mike
http://apple2.sytes.net/

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Re: Apple IIgs ROM3 [message #341275 is a reply to message #341266] Fri, 07 April 2017 00:11 Go to previous messageGo to next message
Antoine Vignau is currently offline  Antoine Vignau
Messages: 1860
Registered: October 2012
Karma: 0
Senior Member
Congrats! Now you can share your IIgs serial number please, as well as the IIgs keyboard layout/country of manufacture/ serial number if that is the real IIgs keyboard.

We collect the data to determine the number of IIgs produced.

Thank you,
Antoine

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Re: Apple IIgs ROM3 [message #341308 is a reply to message #341275] Fri, 07 April 2017 18:26 Go to previous message
Anonymous
Karma:
Originally posted by: john goodwll

On Friday, April 7, 2017 at 12:11:51 AM UTC-4, Antoine Vignau wrote:
> Congrats! Now you can share your IIgs serial number please, as well as the IIgs keyboard layout/country of manufacture/ serial number if that is the real IIgs keyboard.
>
> We collect the data to determine the number of IIgs produced.
>
> Thank you,
> Antoine

I have a ROM 00, ROM 01, ROM 03 now. I will post them tomorrow!

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