Re: FAT-40 PET board check pls?

Unfortunately this particular FAT-40 isn't nowhere near my bench, I'm
just helping remotely, but the owner shouldn't have been attempted
such a repair in the first place, imho. Anyway, I try to help if I
can.
In his board the current situation is UD3 pin 5 (QA) goes into UD2 pin
11, then pin 10 of UD2 goes to clock the various FFs on schematic 8.
So basicly the schematic is correct if we interpret J1 e J2 both going
to a common trace to pin 11 of UD2, but then they should have drawed
them better, like they did for J3/J4... Oh well..

On Fri, Jan 5, 2018 at 8:40 PM, Mike Stein <mhs.stein@gmail.com> wrote:
> If it is *really* as in the schematic then you should indeed lift pin 10; seems unlikely though, although it may have confused someone.
>
> m
>
> ----- Original Message -----
> From: "Francesco Messineo" <francesco.messineo@gmail.com>
> To: <cbm-hackers@musoftware.de>
> Sent: Friday, January 05, 2018 1:35 PM
> Subject: Re: FAT-40 PET board check pls?
>
>
>> On Fri, Jan 5, 2018 at 7:13 PM, Steve Gray <sjgray@rogers.com> wrote:
>>> No, they're not supposed to be lifted, instead the jumpers J1 and J2 should
>>> be properly configured.These pins are part of an inverter in the clock
>>> section to change the master timing. Its possible that this was an 80-column
>>> machine converted to 40.
>>
>> it's missing the additional video RAM to be an 80 column, all the
>> jumpers he could check where for 40-c.
>> Why one would lift those pins if converting a board?
>>
>>
>> Thanks
>> Frank
>>> ________________________________
>>> From: Francesco Messineo <francesco.messineo@gmail.com>
>>> To: cbm-hackers@musoftware.de
>>> Sent: Friday, January 5, 2018 11:48 AM
>>> Subject: FAT-40 PET board check pls?
>>>
>>> Hi all,
>>> can anyone with a 4032 (crtc 8032080 assy) please check if UD2 pin 10
>>> and 11 are supposed to be lifted from the board?
>>> A friend, not on this list, is repairing one and asked about this, he
>>> found these two pins lifted. According to the schematic, they should
>>> not be lifted, but I've never seen an 8032080 assy to be sure.
>>>
>>> Thanks a lot
>>> Frank
>>>
>>>       Message was sent through the cbm-hackers mailing list
>>>
>>>
>>
>>       Message was sent through the cbm-hackers mailing list
>
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