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I will set up a 2-screen system and try it with the command hot-key in the Finder to see if it matches what I remember. The Finder definitely restricts grow to the width of the main screen, even if you override it with the command key (it snaps back)...and the command key is definitely the...

I will add the fan upgrade to my list for that machine! Plus LED Lighting and robotic mobility chassis - YASSSS!! :D

Yeah - the Mac II fan is a nice baby bus engine. The FPU upgrade seems worth it @ min 25% performance gain. I will also be adding an MMU to that machine and upgrading the ROMs, as above. Some day, it may also get a 1.44mb drive if I can find the SWIM for it.

From full testing, it looks like the MC68882RC16A increases FPU performance by about 25-30% vs. the MC68881RC16A in the Mac II. The numbers vary slightly on multiple test runs, but are more or less consistent. I forgot to show the CPU banner on the '881 run, but not worth doing over. The main...

Yes- on the Mac II, it is for VM support.

Regarding PMMUs, I should be receiving more 68851s for testing. So, the Mac II will get a permanent upgrade of its very own.

That is a great question with many subtleties lost to time, or so say certain interdimensional parasites!

I thought the internal pipelining was supposed to be much faster...but also, I didn't include the FPU-specific tests, which was kind of derpy of me. So, I am going to re-run it and test everything. ^_^

Well...I have added a 68882 to the Mac II, but it doesn't seem to improve performance very much. Have any of your benchmarked your Mac IIs with an '881 vs '882?

Thanks! Glad you enjoyed it! I just edited out a few more typos. To your point, there are probably a number of books in my past that someone should have written, but owing to an existential temporal crisis, all the pages were suddenly eaten by interdimensional tapeworms before being written, or...

It looks like this chapter involves Handles, Pointers and Type-Casting in C. If you are new to programming, you should take time to make sure you understand these concepts very well - go over them multiple times, since the programmatic syntax and meaning can be somewhat confusing. Also, misuse...

Well....probably not -- because you can't re-do the card firmware and it's black box -- anyway, a research project. If someone *really* wanted to take on the card in full 32-bit mode, they could make a PDS interface board that replicated the LC slot, managed the host in 32-bit mode and the...

IIRC, the LC is both 24- and 32-bit addressing capable (and the VideoSpigot LC did both...but don't quote me). Devices that expect to be able to access 32-bit addressing (either to write to their own space or the host) have to make _SwapMMUMode calls if they are a 24/32-bit switching device...

The card is probably not that useful on newer machines...and in order to use it, you would have to virtualize the hardware environment if it internally expects 24-bit addressing. Also, it might be difficult for it to control host machine peripheral interfaces. It looks like something fun for its...

It looks like the ProdigySE board probably requires something to be in the PMMU socket -- either the Levco BMMU placeholder or an actual MC68851RC16A. When there is nothing in the socket, there's no power-on beep, no boot process, and my ProdigySE generates a checkerboard pattern. This issue...

On this machine, my 68851 PMMU test was successful. With an MC68851RC16A installed and using the video card in slot $9, I am able to allocate 13Mb of VM and it seems to work great.

I don't know - it's a research project, unless Apple were to put it in the public domain. I don't know anything about this card. Here are some basic assumptions and speculation: It was an LC PDS card, so the main thing would be to figure out the address space for the card and command...

No idea. I never cared too much about Apple's power supply choices and they never really failed for me...ever.

Next up...it looks like my Mac II's logic board has a fully-populated PMMU socket for a MC68851 Upgrade: Here is the MC68851 Pin Pattern for Comparison: Here is the pin pattern for Apple's 70-pin HMMU. If your Mac II has this pin pattern on the back side of the motherboard for the MMU...

I have been working on my Mac II and it is now up-and-running! Initial Treatment: - Thorough cleaning - Removed the old (non-leaking) Varta batteries - Installed new battery sockets - Installed 4Mb - Put in a SuperMac Spectrum/8 Series III 8-bit video card Remaining Items: - Still working on...