Changes

[[Image:Dktronics vision 1.jpg|thumb|343px|right|256K Silicon Disc and 256K expansion (used as plain RAM , without the additional ROM cartridge here)]] The '''Memory Expansions by Expansion''' and '''Silicon Disc''' from [[Dk'tronics]]are both RAM expansions. The Silicon Disc additionally comes with a ROM which contains RAM-Disc functions.

=== Memory Expansions === [[Dk'tronics]] produced 2 different memory expansionsMemory Expansions, a 64K and a 256K which were compatible with all (non Plus) CPCs.

The additional bar commands These were:intended to be used as RAM disc, made in 64K and 256K versions, too.

A further command which was considered to be only for 'advanced' users was also described later === Internal 64KB in the handbook.6128 and External 64KB RAM ===

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=This uses 1)bank, return the number of banks available (where E=2) or (E=3) returned a 0 or 1 to indicate whether bank is mirrored through the expansion card 'had a problem'entire 512KB range. == Covers ==e.g. c4,c5,c6,c7 access the same ram as cc,cd,ce,cf.

<gallery caption="64k In terms of decoding the RAM Dktronics for CPC 464">selection byte:

<gallery caption="256k RAM Dktronics for CPC 464">== External 64KB Silicon Disk ===

Image:256K Dk'tronics for 464 Left CoverThe exact decoding is not known.jpg|Left CoverImage:256K Dk'tronics for 464 Back CoverTesting is needed to confirm.jpg|Back CoverImage:256K Dk'tronics for 464 Right Cover.jpg|Right CoverImage:256K Dk'tronics for 464 Front Cover.jpg|Front Cover

<gallery caption="256k This uses 4 banks (effectively 0-3 on 464 and 1-3 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 Dktronics for CPC of the 6128">.

ImageThe decoding looks like this:256K Dk'tronics for 6128 Left Cover.jpg|Left CoverImage:256K Dk'tronics for 6128 Back Cover.jpg|Back CoverImage:256K Dk'tronics for 6128 Right Cover.jpg|Right CoverImage:256K Dk'tronics for 6128 Front Cover.jpg|Front Cover

b =bank (bank 0 is ignored on 6128 so that internal RAM is visible, 1,2,3 are from the 256KB RAM).s = Other Versions ==selection (0-7)

Dk'tronics also made the "[[Dk'tronics Silicon Disc]]" On 6128 you get 256KB RAM + internal 64KB base RAM Disc. Not sure if/how it differs from the "Dk'tronics memory expansion".

== Upgrade = 256KB Silicon Disk ===

From This uses 4 banks (effectively 4-7), the Australian Mag : TAU 29 pag 04banks are not mirrored.The RAM doesn't conflict with the internal RAM of the 6128 OR the 256KB RAM. The decoding looks like this:

Image:Upgrade 64Kb = banks = selection (0-256K Dk'tronics - TAU 29 pg 04.jpg|Upgrade 64K to 256K7)

== Pictures = Bank Numbers ===

<gallery caption="64k RAM Dktronics for CPC 464 * 64K Expansion and 64K Silicon Disk use only one 64K bank (SMDbank 0)* 256K Expansion uses four 64K banks (bank 0..3)* 256K Silicon Disc uses four 64K banks (bank 4..7)">

Image:The 256K Expansion and 256K Silicon Disc can be used together, resulting in 512K RAM in eight banks (bank 0..7). Plus, the 64K for CPC 464 - 01internal RAM is used (so total RAM is 576K).jpg|64k  === Memory Expansion vs Silicon Disc === Both are basically the same hardware, both contain RAM Dktronics for CPC 464Image:64K for CPC 464 , use same I/O ports, and both are not battery- 02backed.jpg|64k * The Memory Expansions are intended as general purpose RAM Dktronics for CPC 464, and software is included on cassette or disc.Image:64K for CPC 464 - 03* The Silicon Discs are intended as RAM Disc, software is included on ROM. The 256K version uses special bank numbers (see above).jpg|64k RAM Dktronics for CPC 464Image:=== Versions === * The 64K versions (of both Memory Expansion and Silicon Disk) were made only for CPC 464 - 04/664.jpg|64k RAM Dktronics for On CPC 464Image:6128 they would be useless (replacing the 2nd internal 64K for CPC 464 by external 64K). -- 05.jpg|64k RAM Dktronics - Although, reportedly 64K versions DO exist for CPC 464Image:6128 (apparently mapping the 64K for CPC 464 - 06to a location where it doesn't overlap the internal RAM.jpg|64k RAM Dktronics for CPC 464Details are unknown?)Image:64K * The 256K versions (of both Memory Expansion and Silicon Disk) were made in separate versions for CPC 464 - 07/664 and 6128 (they should be compatible at software side, possibly they do differ only cosmetically.jpg|64k RAM Dktronics for CPC 464..?)Image:* All 64K for CPC 464 - 08/256K Memory Expansions, and the 64K Silicon Disc consist of a single cartridge.jpg|64k The 256K Silicon Disc is a special case: It consists of two cartridges shipped together (one contains the ROM, the other contains the RAM Dktronics for CPC 464). == Pictures ==

[[Image:2 - 64Ks - 04 .jpg|thumb|right|150px|Normal and SMD version]][[Image:2 - 64Ks - 04 .jpg|thumb|left|150px|Normal and SMD version]]</gallerycenter><br>There are too many different versions to list all photos on this page.

<See the photo gallery caption="64k RAM Dktronics for CPC 464">:

Image:64K for 464 - 04.jpg|64k RAM Dktronics for CPC 464<big><big>[[Dk'tronics Memory Expansion Gallery]]</big></big>Image:64K for 464 - 05.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 06.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 07.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 08.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 09.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 10.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 11.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 01.jpg|64k RAM Dktronics for CPC 464Image:64K for 464 - 02.jpg|64k RAM Dktronics for CPC 464</center>Image<br style="clear:64K for 464 - 03.jpg|64k RAM Dktronics for CPC 464both;">

Image:2 - 64Ks * <code>|Bank, n</code> - 01 Map a 16K bank directly into memory space (where n is the bank No.jpg)* <code>|The 2 64k RAM Dktronics for CPC 464Swap</code> - Alternate between high and low screensImage:2 * <code>|Low</code> - 64Ks Change to the low screen* <code>|High</code> - Change to the high (default) screen* <code>|Saves, n</code> - 02 Store a screen to a 16K bank (where n is the bank No.jpg)* <code>|The 2 64k RAM Dktronics for CPC 464Loads, n</code> - Retrieve a screen from a 16K bank (where n is the bank No.)Image:2 * <code>|Savew, w, n</code> - 64Ks Stores a windows contents into a 16K bank (where n is the bank No.)* <code>|Loadw, w, n</code> - 03 Load a window with the data from a 16K bank (where n is the bank No.jpg)* <code>|The 2 64k Saved, n, s, l</code> - Transfer original RAM to expansion RAM Dktronics for CPC 464Image:2 * <code>|Loadd, n, s, l</code> - 64Ks Load original RAM from expansion RAM* <code>|Peek, n, s, v</code> - 04 .jpgRead the value of a byte in the expansion RAM* <code>|The 2 64k Poke, n, s, v</code> - Write to a byte in the expansion RAM Dktronics for CPC 464

* <gallery captioncode>|Askram, E, V</code> (E="256k enquiry No. V=variable) could be used to request information from the expansion card, including the amount of RAM Dktronics for CPC 464">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'.

<The whole software (including RSX tools for creating silicon disc compatible CP/gallery>M versions) is contained in the ROM, there is no cassette / disc included. The RSX commands are:

<gallery>caption="256k RAM Dktronics">= CPM ==

Image:256k RAM Dktronics - DiscDk'tronics Bank Switch software comes with NEWCPM.jpg|Disc for 256k COM CP/M program which installs a 61K TPA CPM2.2 which uses the Dk'Tronics RAM Dktronics.See [[DkTronics_CPM]].

<The manual also describes how to patch CPM+ (which is already compatible with Dk'Tronics RAM to run on 464/gallery> 664).

== Tape Reviews ==

* [[Media:Dkt64k.pdf|DK'Tronics 64Kb RAM Expansions DKtronics Manual]] (pdf){{EN}}* [[Media:256K RAM Expansions DKtronics Manual.pdf|DK'Tronics 256Kb RAM Expansions DKtronics Manual]] (pdf){{EN}}* [[Media:256K RAM Expansions DKtronics (Spanish) Manual.pdf|DK'Tronics 64K and 256Kb RAM Expansions DKtronics Manual]] (Spanishpdf) {{ES}}* [[Media:DKTronics_Silicon_Disk_Manual.pdf|DK'Tronics 64K and 256K Silicon Disc Manual]] (pdf){{EN}}* [[Media:DK'Tronics Peripheral - Technical Manual (Edition 1).pdf|DK'Tronics Peripheral - (Edition 1) Technical Manual]] (pdf) {{EN}}* [[Media:DK'tronics Manuel de Utilisation de la RAM d'Extension.pdf|DK'Tronics Manuel de Utilisation de la RAM d'Extension]] (pdf) {{FR}}

* [[Media:Dk'tronics 256k Bank Switch (disc).zip|DkDK'tronics Tronics 256k Bank Switch (disc).zip]] (DSK for Emulators) * [[Media:Dk'Tronics Bank Switch Software (tape).zip|DkDK'Tronics Bank Switch Software (tape).zip]] (CDT for Emulators)* [[Media:SilDsc11.rom|DK'Tronics Silicon Disc 1.1 ROM]] * [[Media:Dk'tronicsSiliconDiscRomImage.zip|DK'Tronics Silicon Disc 1.3 ROM]] * [[Media:SD212.ROM|Dk'tronics Silicon Disc 2.12 ROM]]* [[Media:SiliconDisc64.zip|DK'Tronics 64Kb Silicon Disc 0.3 ROM]]

[[Category:Hardware]] [[Category:Peripherals]] [[Category:Memory expansions]] [[Category:Manual]]