paul2@cs.exeter.ac.uk (Paul Day) (07/09/90)
A friend and I have just purchased Amy 500's and we are wondering about the expansion possibilities. (i) Memory He's a hardware person and I'm more software. He took one look at the 512K ram expansion and declared 'I can do that'. Looking at the schematics it seemed that you could decode up to 8M from the underside 'trapdoor' slot (or whatever its called). Is this correct?? Has anyone built a home-brew memory card for this expansions slot?? If they have could they pass on any hints and tips? He has access to a professional CAD-PCB board design system at his work place, and intends to design the PCB using that. Has anyone got a net-list file for an Amy RAM board that they could mail? (ii) Drives I've got an 80 track D-Sided 5 1/4" drive I used with my BBC. I'd like to hook it up as a drive for MSDOS discs. A couple of questions (a) is this drive suitable? (b) do I need to run it from the Amy's power supply (i.e. from the disc expansion port). (NB the drive already has a built in power supply, but perhaps there is some reason why I need to power the drive from the Amy) Thats all .... for now. Thanks in advance !! Paul Day =============================================================================== = Paul Day, Centre for Connection | uucp: !ukc!expya!paul2 = = Science Computer Science Dept, | BITNET: paul2@cs.exeter.ac.uk.UKACRL = = University of Exeter, Exeter | JANET: paul2@exeter = = Devon, England. | Voice: (0392) 264066 = ================ Putting a spoke in the ear of the unguarded ================== -- Paul Day, Centre for Connection Science, | VOICE (0392) 264066 Computer Science Dept, University of | JANET paul2@exeter.cs Exeter, Exeter, Devon, England. | UUCP paul2@expya.uucp ================ BITNET:paul2%cs.exeter.ac.uk.@UKACRL =================
geoff@actrix.co.nz (Geoff McCaughan) (07/12/90)
In article <2255@expya.cs.exeter.ac.uk> paul2@cs.exeter.ac.uk writes: > >He's a hardware person and I'm more software. He took one look at the >512K ram expansion and declared 'I can do that'. Looking at the >schematics it seemed that you could decode up to 8M from the underside >'trapdoor' slot (or whatever its called). Is this correct?? Has anyone > There is only 1M decoded directly on the chip bus (and 512k of that is in use already) so there is only 512k available directly from the expansion bay. You _could_ put more RAM there, but you'd need extra address decoding which means access to the 68000 address bus, which is not available on that port. >I've got an 80 track D-Sided 5 1/4" drive I used with my BBC. I'd like >to hook it up as a drive for MSDOS discs. A couple of questions (a) is >this drive suitable? (b) do I need to run it from the Amy's power >supply (i.e. from the disc expansion port). (NB the drive already has >a built in power supply, but perhaps there is some reason why I need >to power the drive from the Amy) > This drive will work (with the correct interfacing) and can be used for AmigaDos and/or MS-DOS assuming you use MSH or some other means of accessing the MS-dOS filesystem. There is no need to power it from the Amiga (in fact the Amiga may net be able to supply enough power) - use the drives own power supply. Happy Hacking! -- ------------------------------------------------------------------------------- Geoff McCaughan Email: geoff@actrix.co.nz Phone: +64 3 539545 or 852101 Amiga/Hardware/Unix/Quantum Mechanics Hacker Phax : +64 3 539567 "Anarchy: Think of it as evolution in action." ^ NEW ZEALAND!