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8mb on 68000
- Thread starter barana
- Start date
The only 68000 Macs to do that natively were the PB100 (8MB) and the Luggable (9MB), AFAIK.
Several accelerators had expansion memory slots and addressed the additional RAM using Compact Virtual, IIRC.
Several accelerators had expansion memory slots and addressed the additional RAM using Compact Virtual, IIRC.
More than 4MB of RAM bumps up against the ROM address space in these machines, which is ultimately the limiting factor.
Additionally, SCSI sits in the middle of a relatively large hole in the address space above ROM. For 128k through 512ke machines it would be reasonable to have a 5MB ROM though.
The portable and pb100 are the exceptions because their ROM was located elsewhere.
Additionally, SCSI sits in the middle of a relatively large hole in the address space above ROM. For 128k through 512ke machines it would be reasonable to have a 5MB ROM though.
The portable and pb100 are the exceptions because their ROM was located elsewhere.
@Mineral
Not exclusively, I asked for any way it has been done, preferably with a 68000 is _my_ goal I was thinking along the lines of extra chips or memory expansion Board hack, with altered software to suit.
But thats why I asked questions. Im not only asking what has traditionally Been done, but what other ways it has been done. A case in point of what I deikne as a hack is the scsi ramdisk somone has soldered up recently or say piggybacking chips with some software to match
Not exclusively, I asked for any way it has been done, preferably with a 68000 is _my_ goal I was thinking along the lines of extra chips or memory expansion Board hack, with altered software to suit.
But thats why I asked questions. Im not only asking what has traditionally Been done, but what other ways it has been done. A case in point of what I deikne as a hack is the scsi ramdisk somone has soldered up recently or say piggybacking chips with some software to match
@ MinerAl: Yep, I was as well. "Compact Virtual" would be the key to unlock the SIMMs on all such accelerators.
I imagine CV requires a 68020 with the PMMU upgrade at a minimum, VM doesn't work w/o paged memory capability, IIRC.
I3arana, check to see if you can turn off acceleration while leaving the RAM/VM active on any of the SE/Killy Klip Accelerators.
Then you could consider the upgrade a RAM Disk/VM Co-Processor Card and remain 68000 correct for your Cube! }
I imagine CV requires a 68020 with the PMMU upgrade at a minimum, VM doesn't work w/o paged memory capability, IIRC.
I3arana, check to see if you can turn off acceleration while leaving the RAM/VM active on any of the SE/Killy Klip Accelerators.
Then you could consider the upgrade a RAM Disk/VM Co-Processor Card and remain 68000 correct for your Cube! }
thanks dogcow!, ive found a really good resource on linux m68 for mac site
im also delving into the details on the 52c80 scsi chip and its implementation on the plus&pb100. very interesting.
im erring towards the powerbook 100 sofar, as it seems to have 8mb of system ram available.... which is kinda cool.
for a ramdisk im thinking I will build the avr scsi ramdisk that is floating around the net, but bumping the ram upto 700mb with 72pin simms.
im also delving into the details on the 52c80 scsi chip and its implementation on the plus&pb100. very interesting.
im erring towards the powerbook 100 sofar, as it seems to have 8mb of system ram available.... which is kinda cool.
for a ramdisk im thinking I will build the avr scsi ramdisk that is floating around the net, but bumping the ram upto 700mb with 72pin simms.
