I am subscribed to the digests of the on topic posts.
Sometimes I see follow ups to items which did sound
interesting. Are the on and off topic digests swapped?
Roger Holmes.
> and about half the ICs in it are leaving some of their pins behind
> when removed from sockets as they've corroded right through :-(
This is not uncommon, I've seen it frequently on control systems that
have all socketed ICs. It seems to occur most in the sockets that have
one sprung leaf pressing against a flat side like this \| but also in
other types where the socket contacts the pin surface. All these systems
had been in constant use for more than twenty years.
There were cases where we were getting intermittent errors reported and
on pulling the cards we found at least one IC on each board with pins
detatched.
Hard plated pins, such as TI 74xx series seemed to suffer most with tin
plated steel suffering the least.
Lee.
Could some kind soul crosscheck an MK4564-25IRL DRAM against a D4164-2 for me?
I suspect that I can replace the former with the latter, but the various
datasheet archives on the 'net are being spectacularly unhelpful in providing
a spec sheet for the 4564's :-(
I'm expecting that they're exactly the same pinout and organisation, and that
the 4564-25's are 250ns parts and the 4164-2's are 200ns parts, so they're a
drop-in replacement, but it'd be handy if someone can confirm that!
Worst-case I can pull some 4564's off a spare board, but I'd rather use the
box of 4164's that I have if they'll fit...
cheers
J.
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All,
See below (read from the bottom, sorry for the mixed
top/bottom posting. Sherry Fawcett (sfawcett at maine.rr.com) in Maine
has a Performa that needs a new home. Suggestions welcome, please
contact her directly.
>At 18:44 -0400 7/14/06, sherrill fawcett wrote:
>>Hi Mark - Thank you so much. I don't mind your putting the info out at all.
>>
>>Sherry
>>On Friday, July 14, 2006, at 02:39 PM, Mark Tapley wrote:
>>
>>>Not immediately, but I am on a mailing list of classic computer
>>>collectors. If you don't mind my posting your contact info to the
>>>list, I'll be happy to forward your offer there, and either
>>>someone on the list or someone known by someone on the list is
>>>likely to speak for it.
>Hi - I have a Performa (about 1994) that works fine, but I have no
>room for it. I don't want to throw it away - would just like to
>give it to someone. I'm in Maine. Do you know of anyone in my area
>who might be interested?
>
>Sherry Fawcett
--
- Mark
Cell Phone: 210-379-4635
office: 210-522-6025
The Laser is a pretty perfect clone of the //c. I have no idea what they shipped with, but in elementary school we had them for half the lab. We just used standard DOS 3.3 or ProDOS
disks in them when we needed the O/S. They have (AFAIK) the AppleSoft(like) basic in ROM (there may be some cross-polination with the IIgs machines that started trickling in and
I used for more serious programming), so you can throw on one of the serial image download programs.
I am having a Diablo 31 disk drive shipped to me.
Can anyone advise on how to prepare one of these for shipment,
for example, locking the head actuator?
Thanks,
--Bill
Hi,
I've got a Superbrain here with a little ROM carrier board plugged into the
CRTC chip socket on the Superbrain main board. The carrier board then contains
a TMS2516 EPROM, the CRT8002B IC, and a 74LS08 chip.
Is this something that someone's come across before? Looking at the ROM
contents it looks likely to be a character table. Ideally what I'd like to do
though is take the board out completely and put the CRTC chip directly back in
the socket on the Superbrain's system board, as the carrier board's right in
the way of some of the ICs I need access to in order to diagnose the fault
with the system...
cheers
Jules
--
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(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
