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128K Memory Expander

ORPHANWARE · Memory Expansion
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 128K Memory Expander yet
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Catalogue IDHW-0387
ManufacturerORPHANWARE
Person or teamJohn Lingrel/Ron Collins
TypeMemory Expansion (Expansion)
Connects viaInternal Expansion Slot #3
PlatformADAM
StatusReleased
SourceCollectors DB v1.00 Master

Notes

A 128K memory card for the ADAM from Orphanware - the first size in their range that needs the addressor card catalogued alongside it.

Why the addressor

  • The ADAM's expansion bus was laid out for a 64K expander. Anything larger needs the extra addressing that card provides.
  • Without it, a 128K card behaves as an ordinary 64K expander and the rest is simply unreachable.

What uses it

  • Ordinary ADAM software sees the base 64K plus 64K whatever is fitted - a limit of the software rather than the card.
  • CP/M and T-DOS see all of it and take the surplus as a RAM disk, which is the fastest storage the machine has.

Orphanware's range went to 512K; the larger cards are catalogued here alongside this one.