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/* Mods */
[[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 Expansion''' and '''Silicon Disc''' from [[Dk'tronics]] are both contain expansion RAM, the latter one expansions. The Silicon Disc additionally contains comes with a ROMwhich contains RAM-Disc functions.
== Description ==
For general info on I/O Ports, see:
* [[Standard Memory Expansions]].
=== Internal 64KB in 6128 and External 64KB RAM ===
This uses 1 bank, the bank is mirrored through the entire 512KB range.
e.g. c4,c5,c6,c7 access the same ram as cc,cd,ce,cf.
In terms of decoding the RAM selection byte:
11xxxsss
x = ignored
s = selection (0-7)
=== External 64KB Silicon Disk ===
The exact decoding is not known. Testing is needed to confirm.
=== 256KB RAM ===
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 of the 6128.
The decoding looks like this:
110bbsss
b = bank (bank 0 is ignored on 6128 so that internal RAM is visible, 1,2,3 are from the 256KB RAM).
s = selection (0-7)
On 6128 you get 256KB RAM + internal 64KB base RAM
=== 256KB Silicon Disk ===
This uses 4 banks (effectively 4-7), the banks are not mirrored. The RAM doesn't conflict with the internal RAM of the 6128 OR the 256KB RAM. The decoding looks like this:
111bbsss
b = bank
s = selection (0-7)
On 6128 you get 256KB RAM + 64KB internal extra RAM+ 64KB internal base RAM
=== Bank Numbers ===
* 256K Expansion uses four 64K banks (bank 0..3)
* 256K Silicon Disc uses four 64K banks (bank 4..7)
The 256K Expansion and 256K Silicon Disc can be used together, resulting in 512K RAM in eight banks (bank 0..7). Plus, the 64K internal RAM is used (so total RAM is 576K).
=== Versions ===
* The 64K versions (of both Memory Expansion and Silicon Disk) were made only for CPC 464/664. On CPC 6128 they would be useless (replacing the 2nd internal 64K by external 64K).--- Although, reportedly 64K versions DO exist for 6128 (apparently mapping the 64K to a location where it doesn't overlap the internal RAM. Details are unknown?)
* The 256K versions (of both Memory Expansion and Silicon Disk) were made in separate versions for 464/664 and 6128 (they should be compatible at software side, possibly they do differ only cosmetically...?)
* All 64K/256K Memory Expansions, and the 64K Silicon Disc consist of a single cartridge. The 256K Silicon Disc is a special case: It consists of two cartridges shipped together (one contains the ROM, the other contains the RAM).
== Pictures ==
<gallery caption="256k RAM Dktronics for CPC 6128"big>Image:256K <big>[[Dk'tronics for 6128 Front Cover.jpg|Front CoverImage:256k RAM Dktronics - Disc.jpg|Dk'tronics 256k RAM for 6128Memory Expansion Gallery]]</gallerybig> <gallery caption="64k RAM Silicon Disc for CPC 464/664 (ROM and RAM in one cartridge)"big>Image:NoPicture.gif</gallerycenter> <gallery captionbr style="256k RAM Silicon Disc for CPC 464/664 (ROM and RAM in separate cartridges)">Imageclear:Silicon disk.JPG|Box and Manual</gallery> <gallery caption="256k RAM Silicon Disc for CPC 6128 (ROM and RAM in separate cartridges)both;">Image:Silicon disc front2.jpg|A closeup of 6128 version</gallery> == Disc / Tape == <gallery caption="Bank Switch Software"> Image:256k RAM Dktronics - Disc.jpg|Dk'tronics 256k RAM for 6128Image:Bank Switch Software 1 (tape).jpg|Version 1 for 464/664Image:Bank Switch Software 2 (tape).jpg|Version 2 for 464/664Image:Bank Switch Software 3 (tape).jpg|Version 3 for 464/664 </gallery> == More Pictures == See [[Dk'tronics Memory Expansion Gallery]].
== RSX Commands (Memory Expansion) ==
... - [See manual for now]
== Manuals CPM ==
== Mods ==
* [[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 == * [[Media:Dkt64k.pdf|DK'Tronics 64Kb RAM Expansions Manual]] (pdf) {{EN}}* [[Media:256K RAM Expansions DKtronics Manual.pdf|DK'Tronics 256Kb RAM Expansions Manual]] (pdf) {{EN}}* [[Media:256K RAM Expansions DKtronics (Spanish) Manual.pdf|DK'Tronics 64K and 256Kb RAM Expansions Manual]] (pdf) {{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}}
== Download ==
* [[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]] - none such? (might be one or two versions existing, for 64K and 256K)
