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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.

32K RAM 

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      Z80 CPU Board

 

This page was last modified on 06/06/2015