Re: Help witk IIe card

[Charlie Springer <RAM@regnirps.com>]

On Sun, 5 Oct 2008 15:34:52 -0700, sdspitfire@hotmail.com wrote
(in article <65fie4lg0ocnmhg8n865rdbs4cmbooe5u8@4ax.com>):


You can't find it because you are looking at a batch number or something like 
that. They are Mitsubishi MSM5165 8K static RAM chips in plastic (P) and 
given the time period, the 15 is probably 150ns. The PAL is just the address 
decoder and bus interface in a single chip.

So, it is 16K RAM card, but 1986? Weird. Maybe they just wanted to go small 
like with the tiny 80 col cards. Or maybe it was meant for something small 
like the IIc.

The PAL is an R type, so it has flip-flop registers (L type are just 
combinatorial logic -- no state memory) and could have a soft switch for 
turning access to the RAM on or off and other goodies.

-- Charlie Springer