At 9:04 pm +0100 29/6/00, David L wrote: >From: Robert Wilkinson <[EMAIL PROTECTED]>
>> Can anyone tell me if the 1Meg expansion packs can be paged into memory >and used. >> And if so How. > >IIR - it's in the upper half of memory (C & D) .... >but that doesnt help much I suppose! > >Over to Andrew! I hope you meant Andy Gale or Andrew Chandler or someone, because I don't know! I don't have a 1Mb upgrade so I've never needed to find out. Having said that, I can reproduce the following, parrot fashion, from the tech manual: HMPR (251dec) bit 7 MCNTRL If this bit is set when the CPU addresses high memory, then the external signal XMEM goes low and the Coupe looks on its expansion connector for memory sections C and D (addresses 32768 to 65536) This isn't enough information. I'm pretty certain there are another two ports, one each to specify a page in sections C and D. But I've no idea what port addresses they're at. Over to... Si? Andrew -- --- Andrew Collier ([EMAIL PROTECTED]) ----- Can't think of a quote ---- http://mnemotech.ucam.org/ ---- So I write haiku instead ----- Part 3 Materials Science, Cambridge --- That should do for now --
