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Last modified on 5 February 2010, at 15:39

Dk'tronics memory expansion

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RAM Memory Expansions by Dk'tronics.

Description

Dk'tronics produced 2 different memory expansions, a 64K and a 256K which were compatible with all (non Plus) CPCs.

The expansions meant that CP/M Plus and CP/M 2.2 (with the use of a utility supplied) could both access a 'massive' 61K TPA.

The available memory could be switched in and out of the Z80 64K address block in banks of 16K using either RSX (bar) commands within basic or within an assembly code program.

The additional bar commands were:

  • |Bank, n - Map a 16K bank directly into memory space (where n is the bank No.)
  • |Swap - Alternate between high and low screens
  • |Low - Change to the low screen
  • |High - Change to the high (default) screen
  • |Saves, n - Store a screen to a 16K bank (where n is the bank No.)
  • |Loads, n - Retrieve a screen from a 16K bank (where n is the bank No.)
  • |Savew, w, n - Stores a windows contents into a 16K bank (where n is the bank No.)
  • |Loadw, w, n - Load a window with the data from a 16K bank (where n is the bank No.)
  • |Saved, n, s, l - Transfer original RAM to expansion RAM
  • |Loadd, n, s, l - Load original RAM from expansion RAM
  • |Peek, n, s, v - Read the value of a byte in the expansion RAM
  • |Poke, n, s, v - Write to a byte in the expansion RAM


A further command which was considered to be only for 'advanced' users was also described later in the handbook.

The command |Askram, E, V (E=enquiry No. V=variable) could be used to request information from the expansion card, including the amount of RAM available (where E=1), return the number of banks available (where E=2) or (E=3) returned a 0 or 1 to indicate whether the expansion card 'had a problem'.

Covers

  • 64k RAM Dktronics for CPC 464/664

  • Left Cover

  • Back Cover

  • Right Cover

  • Front Cover

  • 256k RAM Dktronics for CPC 464/664

  • Left Cover

  • Back Cover

  • Right Cover

  • Front Cover

  • 256k RAM Dktronics for CPC 6128

  • Left Cover

  • Back Cover

  • Right Cover

  • Front Cover

Other Versions

Dk'tronics also made the "Dk'tronics Silicon Disc" RAM Disc. Not sure if/how it differs from the "Dk'tronics memory expansion" ?

Upgrade

From the Australian Mag : TAU 29 pag 04.

  • Dk'tronics memory expansion

  • Upgrade 64K to 256K

Pictures

  • 64k RAM Dktronics for CPC 464 (SMD)

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • 64k RAM Dktronics for CPC 464

  • the 2 models of 64k RAM Dktronics for CPC 464

  • The 2 64k RAM Dktronics for CPC 464

  • The 2 64k RAM Dktronics for CPC 464

  • The 2 64k RAM Dktronics for CPC 464

  • The 2 64k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

  • 256k RAM Dktronics for CPC 464

Disc / Tape

  • Dk'tronics 256k RAM for 6128

  • Version 1 for 464/664

  • Version 2 for 464/664

  • Version 3 for 464/664

More Pictures

See Dk'tronics Memory Expansion Gallery.

Manuals

Download