Re: (Fwd) Re: 8032 crt vs. 3032 crt

From: MikeS <dm561_at_torfree.net>
Date: Sun, 23 Jun 2013 11:24:41 -0500
Message-ID: <BB052F8848874E12AC8A1AEB7EF65087@vl420mt>
He's replaced the 6520s with no change.

Meanwhile he's got the BASIC 4 ROMs working somehow, but apparently the
graphics version of BASIC 2 still gives a blank screen.

However, there is also a problem with the upper 16kB RAM; offhand I can't 
see why that would consistently only affect the graphics version, but IMO 
certainly something to look into before spending much more time on the ROM 
puzzle.

m

----- Original Message ----- 
From: "Christian Dirks" <Toast_r@IdeaLine.info>
To: <cbm-hackers@musoftware.de>
Sent: Sunday, June 23, 2013 5:15 AM
Subject: Re: (Fwd) Re: 8032 crt vs. 3032 crt


> The only thing that comes in my mind at first is the 6520 PIA at C7, which
> operates the keyboard, although this seems a bit like a last straw.
>
> Christian
>
> Am 23.06.2013 08:32, schrieb Ruud@Baltissen.org:
>> Hallo Giovi,
>>
>>
>> To be honest, I have no idea. So I forward your question to the
>> famous CBM-hackers again.
>>
>>
>> ------- Forwarded message follows -------
>> From: "Giovi" <stravaccato68@yahoo.it>
>> To: <Ruud@Baltissen.org>
>> Subject: Re: (Fwd) Re: 8032 crt vs. 3032 crt
>> Date sent: Sat, 22 Jun 2013 14:54:58 -0300
>>
>>
>> Hi Ruud,
>>
>> I have a new question for you!
>>
>> With some good and expert friends at
>> http://www.vintage-computer.com I took
>> the decision to fix the original 3032 board.
>>
>> After fixing some minor problems we arrived at a dead point.
>>
>> The computer works (boot and answer to keyboard command) only with
>> the edit
>> ROM for business keyboard. It doesn't work (it hangs with a black
>> screen
>> while booting) with the edit ROM for graphic keyboard.
>>
>> We tried with basic 2 and basic 4, of course with correct set of
>> Rom/Eprom.
>> Same result: ok with business keyboard rom, no way with graphic
>> keyboard
>> rom.
>>
>> We checked it with a petester.bin ROM and all seems ok at least
>> with this
>> simple diagnostic.
>>
>> It *seems* that some instructions in the edit ROM (at $E000) for
>> the graphic
>> keyboard make it to hang.
>>
>>   Have you some experience/ideas about this?
>>
>> I also don't understand if is there any difference (jumpers,
>> components...)
>> between graphic keyboard assy and business keyboard assy...
>>
>> cheers,
>> Giovi
>>
>>
>> ------- End of forwarded message -------
>>
>>
>> --
>>     Kind regards / Met vriendelijke groet, Ruud Baltissen
>> www.Baltissen.org
>>
>>
>>
>>
>>
>>
>>
>>         Message was sent through the cbm-hackers mailing list
>
>
> -- 
> Christian Dirks
> Toast_r@Idealine.info
>
>
>
>       Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list
Received on 2013-06-23 16:00:13

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