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. Don Burns has pointed out that this board seems identical to the
Delta Products 32K RAM board.
The manual for this board can be obtained
here.
Other Tarbell Electronics
S-100 Boards
Cassette
Interface Single Density FDC
Double Density FDC
32K RAM
Z80 CPU Board
This page was last modified
on
06/29/2020