Vortex Expansions RAM card
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RAM expansions card from Vortex.
Not compatible to the dk'tronics memory expansion.
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).
Usable under BASIC and CP/M and offering a RAM disc.
Pictures
Manual
Vortex SP 512 kb RAM Expasion Manual (pdf)