ZX81 and 6116

That's certainly a horse of a different color. So the objective was to replace a set of 4116's with a single 6116? That would reduce the available RAM from 16KB to 2KB. Is that what you wanted? It would be dirt-simple simply to put a 62512 on a business-card-sized daughterboard with the Z-80 and, say, a PAL or a little MSI/SSI logic, in order to fill the memory map with SRAM and disable it wherever a memory-mapped peripheral or other memory lived. Moreover, it would be quite reasonable to copy the content of any EPROM/ROM device into the SRAM and be done with it, i.e disable the ROM. Does that seem at all interesting? Dick ----- Original Message ----- From: "Glen Goodwin" <acme_ent(a)bellsouth.net> To: <classiccmp(a)classiccmp.org> Sent: Saturday, March 23, 2002 8:59 PM Subject: Re: ZX81 and 6116