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CMOS staic RAM board

Dwight Elvey

Veteran Member
Joined
Jun 21, 2003
Messages
4,802
Location
Santa Cruz
I have a RAM board with 64K of 6116s. It has not manufacture label. The switches are labeled. There are some for extended addressing above A15, These I understand. It has another set of switches labeled:

E000
E800
F000
F800
EXT ADR
HALF PHANT
PHANT

I assume EXT ADR enables extended addressing. I would think that the E000 thru F800 disable the RAM for areas with typical ROM.
I would guess PHANT is to observe the PHANTOM pin.
What would HALF PHANT be?
Dwight
 

Dwight Elvey

Veteran Member
Joined
Jun 21, 2003
Messages
4,802
Location
Santa Cruz
Never mind. I found the board. It seems to be a Digital Research 64K board. I found a manual for it. It seems the HALF PHANT only looks at the Phantom pin when the address is below 32K. I'm not sure why one would want that but that is what it does.
Dwight
 
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