Re: LL PCB repair

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 05:16:47 2013