Anyone have a datasheet or pin out? for a D2111AL-4 1Kx4bit 200ns Static Ram
zoopydogsit
Posts: 174
Folks,
Help!
I'm doing a sentimental repair of an old Fidelity Electronics Chess Challenger 7. An early 1980's Z-80 based chess computer, amazing and brilliantly put together for it's time. Quite a serious competitor at the time and won lots of awards. I'm repairing it for someone who learned to play chess on it from their deceased uncle. The faults are inconsistent, but each end with the Z-80 going into a halt state. I've changed some of the key components that can pull up data lines. But I suspect it's likely the D211AL-4 static ram have become alheimic. I'm planing on replacing them by a much more modern 8 bit static ram that I have in my junk box. I can probably map out the current circuit and implement, but it'll probably be much more efficient and successful from a pin out.
I've searched the web and can't find a datasheet or a circuit diagram. Unfortunately we through out my old databook collection years ago when we ran out of space and found that ALL DATASHEETS normally have most pin outs. I haven't looked in GOOGLE books, there may be something there (that would be nice!).
Does anyone have an old databook/circuit diagram or a pointer to a datasheet?
Any help greately appreciated.
Regards,
Dave
Help!
I'm doing a sentimental repair of an old Fidelity Electronics Chess Challenger 7. An early 1980's Z-80 based chess computer, amazing and brilliantly put together for it's time. Quite a serious competitor at the time and won lots of awards. I'm repairing it for someone who learned to play chess on it from their deceased uncle. The faults are inconsistent, but each end with the Z-80 going into a halt state. I've changed some of the key components that can pull up data lines. But I suspect it's likely the D211AL-4 static ram have become alheimic. I'm planing on replacing them by a much more modern 8 bit static ram that I have in my junk box. I can probably map out the current circuit and implement, but it'll probably be much more efficient and successful from a pin out.
I've searched the web and can't find a datasheet or a circuit diagram. Unfortunately we through out my old databook collection years ago when we ran out of space and found that ALL DATASHEETS normally have most pin outs. I haven't looked in GOOGLE books, there may be something there (that would be nice!).
Does anyone have an old databook/circuit diagram or a pointer to a datasheet?
Any help greately appreciated.
Regards,
Dave
Comments
Good idea, and I'll keep that in mind. However the main objective is to get it working rather than what's under the covers. As I have a bunch of 6264's and their equivalents and event more modern static ram chips lying around I thought that it's probably just as easy to wire one in their place. From looking at the datasheets it should be quite do-able, timing etc shouldn't be a problem. Likely a job for next weekend if I can't find time before.
It may be a good fall back if the fault significantly changes after wiring in something else.
The Intel datasheet can be found here:
http://www.datasheetarchive.com/2111A-datasheet.html
A little history of Fidelity:
http://www.spacious-mind.com/html/fidelity.html
Find the user manual here:
http://alain.zanchetta.free.fr/docs/Fidelity/ChessChallenger7US.pdf