5 Mar
2013
5 Mar
'13
10:23 a.m.
Hi,
I have recently received and repaired a TRS-80 Model 200 machine. Woot!
My query is if anybody has any experience in adding extra memory - I note
that it has some sockets under it for memory expansion, but the recommended
devices are 24k (A ceramic carrier with 3 x 8K chips and some decoding -
Has anybody had experience using 62256 or similar parts?
The M200 reference manual has a diagram of the RAM module. It is just
three 8kx8 RAMS and a 74LS138. So with a conversion socket, a 32kx8 RAM
will probably work too.
http://electrickery.xs4all.nl/comp/m200/doc/TRS-80_Model-200_reference-manu…
This type of caramic devices was core business for Kyocera, which made
the M100 line of computers.
Fred Jan