Tarbell Electronics -- 1011A Floppy Disk Controller
This was the only RAM board Tarbell Electronics made.
It was unfortunately too little too late. RAM boards had moved to Dynamic chips
or low power static chips. The board is now quite rare.
The board had a capacity or 32K. Note the NINE voltage regulators -- probably a
record for a S-100 board. It had bank switching capability and recognized
the Phantom line. The board utilized TMS 4044 (MM5257) 4KX1 RAM chips.
Rows of chips could be selected in 8K increments by jumpers in the top middle of
the board. A nice memory test program was supplied in the manual as well
as a schematic.
The manual for this board can be obtained
here.
If anybody could donate a better picture that would be great.
Other Tarbell Electronics
S-100 Boards
Cassette
Interface
Single Density FDC
Double Density FDC
32K RAM
This page was last modified
on
01/08/2011