efp90@ecs.soton.ac.uk (Pritchard EF) (03/14/91)
In <1991Mar13.004556.14039@minyos.xx.rmit.oz.au> s902113@minyos.xx.rmit.oz.au (Luke Mewburn) writes: >ccgavin@uqvax.cc.uq.oz.au writes: >>I would like to be able to use an A501 ram board with a Rev 6A A500 computer >>that has 1Mb of memory (chip) on its' motherboard. This configuration does not >>seem to work without some hardware mods. Anybody know how????? >Can't be done with an A501. >Commodore, in there great wisdom :) brought out an A500 which can use 1Mb >of chip ram (ie, rev 6A and newer). Anyway, the address space used for the >extra .5Mb of Chip was also allocated to the A501. Result: You can't have a >clock (ie, the A501) on an A500 with 1Mb chip ram on the motherboard. So >you can't have 1.5Mb either. >Unless... > You did what I did. I got an 'AX-RAM' board (2Mb version) from SE WATTS >Electronics in Hoppers Crossing (Victoria). This allows (when populated to >2Mb), you to have an A500 rev 6A, with 1Mb chip ram (only .5 on the >motherboard tho- the other half is on the AX-RAM), 1.5Mb fast (??) ram, and >a clock. If you don't want 1Mb chip ram, you can have 2Mb fast instead. >BUT, you still have to remove the extra .5Mb of chip if you did install it, >(and use these to populate the AX-RAM) >>Many Thanks, >>Gavin....... >>-- >>Internet: ccgavin@uqvax.cc.uq.oz.au Phone: +61 7 365 3942 >> Postal: Gavin Stone-Tolcher, Prentice Computer Centre (Network Management) >> Queensland University, St Lucia, QLD Australia 4072. >------------------------------------------------------------------------ >| Luke Mewburn (Zak) | This side for rent... | >| s902113@minyos.xx.rmit.oz.au | | >------------------------------------------------------------------------ You can do the same thing with the IDC Ad-RAM which is probably more availiable in Europe and the USA. Again, this requires removing the extra DRAMs from your A500 board and inserting them into the Ad-RAM board I'm afraid. (You did socket them didn't you? :-| ) By the way the IDC Ad-RAM is a very good product, though I am worried that I may have troubles upgrading or adding other items which need a board under Gary, since that is where Ad-RAM goes too... E.F.Pritchard. efp90@uk.ac.soton.ecs
etj90 (The Binary Warlock) (03/14/91)
With the Datel Electronics 0.5MB board you just flip a switch on the board if you have the right Agnus.