Mac Plus problem

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iamdigitalman's picture
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Joined: Mar 1 2004 - 22:18
Mac Plus problem

well, I just did a clean install of system 6.0.8, and I must say, the inerface is really stable. only problem is, I still have the stock 1mb of ram in the thing, and I have Multifinder on. I have two questions:

1. I have 15mb left on my hard drive, is there any program like the virtual memory program on the system 6 heaven website that works under a 68000 processor? the one on that site needs a 68020 or 68030.

2. Is there a website that still sells vintage 1mb 72 pin SIMMS @ 150ns?

when I am running the Plus, I usually have less than 300k to use. I cant install programs unless I turn off the multifinder, but I like it on.

thanks in advance. -digital Wink

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Joined: Dec 20 2003 - 10:38
1) dunno, 2) ! not 72 pin, 30 pin !

30 pin simms of any speed 150ns or faster will work a Plus, I just can't imagine you could find ram slower than 150ns!

contact me, I've got bags of 1MB 30pin simms, your's for an SASE. Offer goes to anyone, not just iamdigitalman. Reasonable limits apply, say max 8 each. Biggrin

macdan at comcast dot net

shipped from USA, 08618

Dan K

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my fault

your right, it is 30 pin. 72 pin are what I have. musta misread my source. I will take you up on that offer. Lemmie PM you. still need info on virtual memory program. thanks. -digital Wink

Jon
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The reson the programs requir

The reson the programs require a 68020 (w/ a PMMU, 68551?) or a 68030 is the use of a MMU. THe MMU is a Memory Management Unit. It can create virtual address space for the processor, and translate that space into what is currently in physical RAM and disk RAM to seem like one big physical RAM chunk. THE MMU does in hardware what would be very messy and CPU intensive to do only in software. The VM drivers you found tell the MMU what to do and where to put stuff under the virtual address space. There were MMU add-ons for 68000 Amigas (I've heard of 'em for the A1000 and A500) but I've not much knowledge of early Mac accellerators and add-ons to know if anyone built a simple MMU/FPU add-on that didn't also go ahead and add a 68020 or 68030 too. Running VM on a simple 68000 will be vey very slow since all the work is done by the CPU, and the slow disk controller, and the slow memory bus... Blum 3

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optimem?

ancient utility/init/cp, named (IIRC!?) optimem. It didn't need or use VM, just dynamically messed about with the ram allocation of each open app. Worked really well too (IIRC!?) Worked on any Mac, but (IIRC!?) may have needed Sys7. I can't lay my hands on my old installer floppy, otherwise I'd have more details.

worth looking into anyway, might be a solution for your problem.

Dan K

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Joined: Dec 20 2003 - 10:38
Here you go

This app worked really well for me when I had a plus. http://www.jagshouse.com/RamChargerScreenShot.html

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That's it!! Optimem RamCharger!!

Damn, I couldn't think of the whole name. Yup, good stuff and just the ticket for those original 68K Macs.

Now just march right down to your local CompUSA (or similar) and buy yer self a copy!!

Blum 3 Riiiight! You'd first have to go back in time a decade or so I reckon.

Heck if I know where to get it, I can't even find my old copy.

Dan K

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Joined: May 27 2004 - 02:42
AAARGGG!!! I NEED THIS!!

AAARGGG!!! I NEED THIS!!

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