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Memory Addressor Card

E&T SOFTWARE / M.M.S.G. · Expansion Module
Platform, category and status for this entry were derived automatically from the source list and have not yet been checked by hand.
No photographs catalogued for Memory Addressor Card yet
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Catalogue IDHW-0327
ManufacturerE&T SOFTWARE / M.M.S.G.
Person or teamEd Jenkins
TypeExpansion Module (Expansion)
Connects viaInternal Expansion Slot #2
PlatformADAM
StatusReleased
SourceCollectors DB v1.00 Master

Notes

The card that lets an ADAM reach memory beyond 64K. It is not itself memory - it sits in slot #2 and does the addressing, while the RAM lives on a separate card.

Why two cards

  • The ADAM's expansion bus was designed around a 64K expander. Anything larger needs the extra address lines this card provides.
  • Without an addressor, a 256K memory card behaves as an ordinary 64K expander - the rest of it is simply unreachable.

What uses it

  • Most ADAM software sees only the base 64K plus 64K of expansion, whatever is fitted.
  • CP/M and T-DOS see all of it, and use the remainder as a very fast RAM disk - which is what a large expander is really for.