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 expansions expansion card from made by [[Vortex Computersysteme|Vortex]], mounted between CPC464 CPC 464/664 mainboard and CPU/Gate Array. It won't fit on CPC664, CPC6128the cost-down CPC 464, CPC 6128 or CPC+ boards. The card is not compatible with the standard [[dk'tronics]]-sytle 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.
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 Inside
Image:Letter 30-1-86.jpg|Screens Microcomputer Distribution Letter - 30/01/1986
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* [[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.vortex.de Vortex/ICP-Homepage]
* [http://www.cpctech.org.uk/docs/sp512.html Vortex SP512 RAM Card]
[[Category:Peripherals]] [[Category:Manual]][[Category:Memory expansions]][[Category:Expansion ROM]]