Re: LL PCB repair

You are correct, it's was a long day :)

On Sat, Feb 23, 2013 at 4:16 AM, Andre Huijts <a.huijts@upcmail.nl> wrote:
> Uh, don't understand why 4000-47FF should be a ROM test ? It is the Vector RAM area or is this a case where the Processor can't read back the data put into it and it's being read out by the vector generator only ? The buffer is bi-directional (74LS245) however. I'll check the buffer.
>
> I'll also pop it into my LL cab to see if anything is happening at all. I guess since the Watch-dog keeps re-setting it won't do much though.
>
>
>
>
> Op 23 feb. 2013, om 04:42 heeft Kevin Moore <talon.k@gmail.com> het volgende geschreven:
>
>> Actually I don't think the Rom sigs are the same for both. I seem to
>> recall someone stating that the 9100 does it differently come to think
>> of it.
>>
>> as for this "When I run a test on RAM area 4000-47FF I get d0 and d1
>> as stuck high." It should be a ROM test, but since it seems to think
>> that D0 and D1 are stuck high I would assume that those datalines are
>> bad.
>>
>> As for the Ram locations they are the same for asteroids and LL
>>
>> But on the Asteroids I think the Rom region starts at 5000 and not 4800 like LL
>>
>> Kevin
>>
>>
>> On Fri, Feb 22, 2013 at 5:15 PM, Andre Huijts <a.huijts@upcmail.nl> wrote:
>>> Question about ROM sigs, are the 9010A and 9100A sigs the same ?
>>>
>>> I also assume I'll need the Asteroids Sigs for this board...
>>>
>>>
>>> Op 22 feb. 2013, om 14:17 heeft Kevin Moore <talon.k@gmail.com> het volgende
>>> geschreven:
>>>
>>> Yeah I use those low profile ones too.
>>>
>>> This is all I have on LL notes for Rom/Prom and Ram checks
>>>
>>> Rev1
>>>
>>> Region ROM File Start - End CRC 9010A
>>> CPU1 034599.01 4800 - 4FFF 355A9371 65AF
>>> CPU1 034598.01 5000 - 57FF 9C4FFA68 AC98
>>> CPU1 034597.01 5800 - 5FFF
>>> CPU1 034572.01 6000 - 67FF 2AFF3140 D5D4
>>> CPU1 034571.01 6800 - 6FFF 493E24B7 C28E
>>> CPU1 034570.01 7000 - 77FF 2724E591 2707
>>> CPU1 034569.01 7800 - 7FFF B11A7D01 8644
>>>
>>> Rev2
>>>
>>> Region ROM File Start - End CRC 9010A
>>> CPU1 034599.01 4800 - 4FFF 355A9371 65AF
>>> CPU1 034598.01 5000 - 57FF 9C4FFA68 AC98
>>> CPU1 034597.01 5800 - 5FFF
>>> CPU1 034572.02 6000 - 67FF B8763EEA 206D
>>> CPU1 034571.02 6800 - 6FFF 77DA4B2F AC38
>>> CPU1 034570.01 7000 - 77FF 2724E591 2707
>>> CPU1 034569.02 7800 - 7FFF 72837A4E 26EA
>>>
>>> Program Ram Region
>>> 0000-01FF
>>> Vector Ram Region
>>> 4000-47FF
>>>
>>> This is pretty much what I do for all of them, just list the revs with the
>>> fluke sigs, and Ram regions for quick testing. I've not gotten around to
>>> actually writing scripts yet.
>>>
>>> Kevin
>>>
>>> On Thu, Feb 21, 2013 at 6:42 PM, vectorlist-steve
>>> <vectorlist@arcadehacking.com> wrote:
>>>>
>>>> On 2/21/2013 3:35 PM, Jess Askey wrote:
>>>>
>>>> Man.... I had an email all typed up saying that I bet $5 it was the
>>>> crystal but then I deleted it as I didn't want to seem like an pretentious
>>>> ass. :-) Now Im just a groveling-wannbe-ass. :-) :-)
>>>>
>>>>
>>>>
>>>> Funny, I did too. ;-)
>>>>
>>>> Andre, do yourself a favor and order the low profile xtals. Apparently
>>>> mouser no longer stocks these in the 12.096 MHz but they are
>>>> soooooooooooooomuch better than the standard height components and really
>>>> can't snag on anything and snap off.
>>>>
>>>> Picture below (not sure if it will come through on the list).
>>>>
>>>>
>>>> <abl.jpg>
>>>>
>>>>
>>>>
>>>
>>>
>>> André Huijts
>>> andre.huijts@upcmail.nl
>>>
>>>
>>>
>>>
>>>
>>
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>
> André Huijts
> andre.huijts@upcmail.nl
>
>
>
>
>
>
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Received on Sat Feb 23 06:10:40 2013