Stuff thats not completely compatible

[darksun9210]

yeah, like 64/128Mb 72 pin simms in a cyberstormPPC! grrrr. not fair.
for peace of mind, get 32Mb FPM simms not the edo version, or it'll only recognise the first bank of 16Mb per simm. something to do with PC hardware people getting lazy and not adering to the standard as EDO was really a stop gap so they could make cheaper memory controllers.

but they work in a blizzard PPC, upto 128Mb per simm! whats that about? can the cyberstorm be flashed to take 128Mb simms? 512Mb of ram!

oh well....

[darksun9210]

wait wait waaaaait a cotten picken minute here.

i seem to remember something along those lines.
White knight Technology (anyone remember those guys?) used to advertise (amongst otherthings) an Excaliber board. it said something like
"use your existing processor! add an extra 128Mb of ram!"
leading people to belive it was a card that went betweeen the accelerator and the mainboard. as that was the only way it would seem to fit into the advertising....
but what they MENT was, uses the CPU off your accelerator / A3640 and gives you capacity for extra 128Mb ram... basicly like a warp engine without the CPU or scsi interface. major disapointment. i only found out about 8 months ago.

oh and yeah, i remember the 4Mb for £120 UK pounds. so at the time of design, 128Mb was a nutty amount, but the zorro3 standard allows for 256Mb of addressable space per slot. as far as i can tell in the design documents mentioned above, i can only see about 1.3Gb required for the mainboard. so these bus boards with 7 slots and one CPU slot if filled to capacity  would give ~1.9Gb. total 3.2Gb out of 4Gb.

so really it is do-able. but i think you are right with regard to the CPU slot addressing. 128Mb Was a crazy amount about hmm 10 years ago. so why more? this is the problem here, we are looking at a 10 year old design i suppose.... would have been nice tho... like 8Mb chip ram  ;-)

[darksun9210]

dammit! i never thought ot that!  :-D

1.76Gb of addressing and it goes where?

D'oh!

[darksun9210]

no more coffee for that man!

erm, back to subject.
when i had my A500, got a 2Mb chip ram expansion for it, and an M-tec 28Mhz 020 accelerator (+8Mb fast) for it that bolted onto the 68000 socket. unfortunatly, i never fitted the accelerator, as the chip ram / agnus socket got in the way. was looking around for one of those IDE interfaces that bolted onto the 68000 socket to raise the accelerator above the 2Mb agnus.

this with an A570, 3.1 rom, ECS denise. any thoughts on problems? bit concerned as not sure how it'd all work together...

oh btw, how about a PPC accelerator that fitted the 68040/060 socket like the cyberstorm PPC developer board... then all 040 equiped A500/1000/2000's could be PPC based....?