=== 256KB RAM ===
This uses 4 banks (effectively 0-3 on 464 and 21-3 on 6128). It appears the 256KB RAM detects the 6128, possibly using /EXP but this is to be confirmed, so that it doesn't conflict with the 'extra 64KB' (i.e. c4-c7) RAM of the 6128.
The decoding looks like this:
The Bank Switch Software RSX commands are:
* <code>|Bank, n </code> - Map a 16K bank directly into memory space (where n is the bank No.)* <code>|Swap </code> - Alternate between high and low screens* <code>|Low </code> - Change to the low screen* <code>|High </code> - Change to the high (default) screen* <code>|Saves, n </code> - Store a screen to a 16K bank (where n is the bank No.)* <code>|Loads, n </code> - Retrieve a screen from a 16K bank (where n is the bank No.)* <code>|Savew, w, n </code> - Stores a windows contents into a 16K bank (where n is the bank No.)* <code>|Loadw, w, n </code> - Load a window with the data from a 16K bank (where n is the bank No.)* <code>|Saved, n, s, l </code> - Transfer original RAM to expansion RAM* <code>|Loadd, n, s, l </code> - Load original RAM from expansion RAM* <code>|Peek, n, s, v </code> - Read the value of a byte in the expansion RAM* <code>|Poke, n, s, v </code> - 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:
* <code>|Askram, E, V </code> (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'.
== RSX Commands (Silicon Disc) ==
... - [See manual for now]
== CPM ==
Dk'tronics Bank Switch software comes with NEWCPM.COM CP/M program which installs a 61K TPA CPM2.2 which uses the Dk'Tronics RAM.
See [[DkTronics_CPM]].
The manual also describes how to patch CPM+ (which is already compatible with Dk'Tronics RAM to run on 464/664).
== Reviews ==
* [[Media:Upgrade 64K-256K Dk'tronics - TAU 29 pg 04.jpg|Upgrade a 64K expansion to a 256K expansion]] - from the Australian Mag : TAU 29 pag 04.
* An article in [[Amstrad Action ]] ([[Amstrad_Action,_Issue_46,_Jul_1989|Issue 46, July 1989]], [[:File:AmstradAction046-16.jpg|page 16 ]] and [[:File:AmstradAction046-17.jpg|17]]) described how a Silicon Disk can be converted into a memory expansion.
== Manuals ==