== 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:
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'.
== Other Versions ==
Image:256K for 464 - 11.jpg|256k RAM Dktronics for CPC 464
Image:256k RAM Dktronics - Disc.jpg|Disc for 256k RAM Dktronics
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Image:64K for 464 - 04.jpg|64k RAM Dktronics for CPC 464
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Image:64K for 464 - 10.jpg|64k RAM Dktronics for CPC 464
Image:64K for 464 - 11.jpg|64k RAM Dktronics for CPC 464
Image:64K for 464 - 01.jpg|64k RAM Dktronics for CPC 464
Image:64K for 464 - 02.jpg|64k RAM Dktronics for CPC 464
Image:64K for 464 - 03.jpg|64k RAM Dktronics for CPC 464
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