RAM expansions card from [[Vortex Computersysteme|Vortex]].== Technical ==
Not compatible to the [[dk'tronics]] memory expansionBOS ROM exists at rom slot 6 and is decoded exactly (no repeat).
Sold in different sizes of DFxx is decoded by the Vortex RAM as '''SP 64''', '''SP 128''', '''SP 256''', '''SP 320''' Expansion (for BOS) and '''SP 512'''uses xx0xxxxx xxxxxxxx xxxxxxxx xxxxxxxx (same as other ROM expansions).
Resulting in a maximum RAM size of 576K (64K internal, plus 512K external).The FBBD port is decoded as: xxxxx0xxx0xxxx0x
This means just 3 bits are decoded for it. Data written to the vortex RAM doesn't write through to main RAM. On Reset the BOS rom is activated. Bits 7 and 6 written to FBBD are ignored. Bit 5 is for enabling the ram expansion. Bit 2,1,0 set the bank. Bit 3 is documented as enabling and disabling the ROM, but I found it didn't work exactly like that. If bit 3 is set to 1, and upper ROM is enabled with port 7fxx, then ROM on the Vortex RAM Expansion is enabled in the range &c000-&7fff. If bit 3 is set to 1, and lower ROM is enabled with port 7fxx, then ROM on the Vortex RAM expansion is enabled in the range &c000-&7fff. If bit 3 is 0, then normal operation happens. ROM is visible in the range &c000-&7fff only if ROM slot 6 is selected and the upper rom is enabled with port 7fxx. When bit 3 is 0, the rom is not visible in the range &0000-&3fff at any time. It is possible this part of my (arnoldemu) vortex ram expansion is broken, but all other operation works perfectly and the BOS rom is active at reset time and can be used as normal. On my (arnoldemu) vortex ram expansion, the bus has the value 0. It seems the vortex is forcing the value on the bus. == Description == A RAM expansion card made by [[Vortex Computersysteme|Vortex]], mounted between CPC 464/664 mainboard and CPU/Gate Array. It won't fit on the cost-down CPC 464, CPC 6128 or CPC+ boards. The card is not compatible with the standard [[dk'tronics]]-style [[Standard Memory Expansions]]. Sold in different sizes of RAM as '''SP 64''', '''SP 128''', '''SP 256''', '''SP 320''' and '''SP 512'''. Resulting in a maximum RAM size of 576K (64K internal, plus 512K external). The smaller SP64-SP320 versions can be upgraded to SP512 by mounting additional RAM chips in the spare sockets. There is also a cut-down version, '''SP 64/M''', which contains only 64K RAM, no BOS ROM, and which isn't upgradable. The expansion was available directly from Vortex (germany) and also from [[Screens Microcomputers]] (uk). Usable under [[BASIC]] and [[CP/M]] and offering : === BASIC === BOS (Banked Operating System) RSX drivers are included on EPROM (mapped to ROM bank 6). Providing following features under BASIC:* Banked BASIC programs (using |GOTO, |GOSUB, |RETURN commands, for example: |GOTO,bank,line)* Pseudo Floppy (unlike a RAMDISK, this "floppy" can be accessed only via special RSX commands)* Debugger (aka Z80 Monitor) activated via |MON (v1.0) or |XM (v2.1)* Printer Spooler* Plus some extras like |FAST and |SLOWNote: Some of the RSX commands are always available, some only after typing |BOS. === CP/M === PATCH.COM is included on cassette. After copying the file from cassette to disk, it can be used to upgrade normal CP/M to support the expansion RAM disc. Providing following CP/M features:* 62K TPA* RAMDISK (unlike the BASIC Pseudo Floppy, this acts like a regular disk drive)* Printer SpoolerNote: There is a bug/problem with COPY.COM no longer working after installing PATCH.COM. A bugfix is listed in the appendix of the manual.
== Pictures ==
<gallery caption="The Vortex Expansion RAM card">
Image:sp512top.jpg|Vortex Expansion RAM (top)
Image:Sp512bot.jpg|Vortex Expansion RAM (bottom)
Image:cpc464bf.jpg|CPC 464 before put the Expansion RAM card
Image:cpc464af.jpg|CPC 464 after put the Expansion RAM card
Image:Vortex_PCB_Top.jpg|Vortex Expansion (Top, scanned)Image:Vortex_PCB_Bottom.jpg|Vortex Expansion (Bottom, scanned)File:Vortex Memory Expansion Advert (CPC Schneider International, issue 8-1985, page 15).jpg|Advert (CPCI 8-1985)Image:Leaftlet Front.jpg|SP64 The 520 Concept Leaftlet Front Image:Leaftlet Inside.jpg|SP64 The 520 Concept Leaftlet InsideImage:Letter 30-1-86.jpg|Screens Microcomputer Distribution Letter - 30/01/1986
</gallery>
== Technical (very incomplete) Installation ==
* This section describes how you can access the See [[Installing Vortex Expansion RAM of the SP512.* The exact decoding (e.g. complete or partial) of I/O port addresses is not confirmed at this time.* The port addresses given are recommended and are those used by B.O.S.]].
I/O port &FBBD: Bit Function 7 Unknown 6 Unknown (Discology utility uses it - does it choose RAM in 32K blocks instead of 64K blocks??) 5 When 1, bits 2..0 define which 64k block of SP512 RAM to select. When 0, chooses internal 64K RAM of CPC464. 4 Unknown 3 Unknown 2..0 Used to choose the 64K block of the SP512 to select== Manual ==
I/O port &7F00* [[Media: Bit Function 7 Set to Vortex SP 512 Kb (BOS 1 6 1 = make RAM visible in range &8000-&FFFF, .0 = make ) Manual.pdf|RAM visible in range &0000-&7FFFExpansions for CPC 464 (Vortex) Manual]] {{DE}} {{PDF}} 5 Set to 1 to activate SP512* [[Media:RAM Expansions for CPC 664 (Vortex) Manual. If bit 5 of &FBBD is 1 will select SP512 ram, otherwise select pdf|RAM of CPC464.Expansions for CPC 664 (Vortex) Manual]] 3 1 = Upper ROM disable, 0 = Upper ROM enable 2 1 = Lower ROM disable, 0 = lower ROM enable 1,0 Screen mode{{DE}} {{PDF}}
* When bit 5 is 0, then bit 6 is ignored.* When reading, ROM has priority over the [[Media:Vortex RAMExpansions SP64-SP512 User Handbook (English) (Screens Microcomputer Distribution Ltd).pdf|RAM Expansions for CPC 464 (Screens Microcomputer Distribution Ltd) Manual]] {{EN}} {{PDF}}
== * [[Media:Vortex BOS 2.0 Manual ==.pdf|BOS 2.0 (Vortex) Manual]] {{DE}} {{PDF}}
* [[Media:Vortex SP 512 kb RAM Expasion ManualVortex_Ext_SPM_-_Memory_mapping_(DEU).pdf|Vortex SP 512 kb RAM Expasion ManualMemory mapping]] {{DE}} {{PDF}}* [[Media:Vortex_Ext_SPM_-_Principe_d'utilisation_des_cartes_d'extension_RAM_(FRA).pdf|Principe d'utilisation des cartes d'extension RAM]] {{FR}} {{PDF}}* [[Media:Vortex_Ext_SPM_-_Principe_of_operation_and_control_(ENG).pdf|Principle of operation and control]] {{EN}} {{PDF}}
== Weblinks Software ==
[http:* BOS (Vortex Banked Operating System) (RSX commands on built-in EPROM, mapped to ROM bank 6) (under BASIC, the RAM is used as program/data region, BASIC programs can |GOTO and |GOSUB to expansion banks)* Driver Cassette (includes PATCH.COM for upgrading CP/wwwM to support the expansion RAM) (62K TPA, plus RAMDISK and printer SPOOLer)* Further patches - the manual contains additional patches for some BASIC and CP/M programs* [[Discology]]* [[RCPM]] (RAM CP/M, 1989-1990 by [[Guenter Radestock|Günter Radestock]]) (RCPM is an alternative to the PATCH.vortex.de COM from Vortex/ICP)* [[G-HomepagePaint]] 2.0 (by Günter Radestock) == Downloads == * [[Media:Bos10.zip]] - BOS v1.0 ROM-image* [[Media:BOS10ALT.ZIP]] - BOS v1.0 ROM-image (Alternative version)* [[Media:Bos21.zip]] - BOS v2.1 ROM-image* [[Media:BOS21 664.zip]] BOS v2.1 ROM-image (CPC 664 version)* [[media:vramid.zip|Vortex RAM ID ROM]] - RAM ID ROM Image == Weblinks ==
* [http://www.kjthackercpctech.f2sorg.comuk/docs/sp512.html Vortex SP512 RAM Card]
[[Category:Peripherals]] [[Category:Manual]][[Category:Memory expansions]][[Category:Expansion ROM]]