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I'll look and see -- I don't know if mine do or not. I didn't notice it. I did my official 68851 PMMU upgrade today. Works fine. Goodbye HMMU. :'( :D

I think this one has negative ROI - just sayin'. :D

I think that ROM division has more to with cost/device density, speed (interleaving), space and processor interface, plus anything else that favored the design, bearing in mind that "cost" has many factors -- part management/availability, programming, assembly, etc. The simple answer that...

The ROM upgrade from Mac II ROMs to IIx/FDHD ROMs was successful. With the help of a quick python script from another online user, I split the IIx ROM at MacintoshRepository into 4 parts and then burned the 4 images into their target 27C512 devices. From there, I installed the ROMs, low to high...

I don't know. We don't know anything about the card internals, it is a PDS card and, internally, we don't know how it is managing its addressing. One possibility might be to virtualize the PDS slot. The other way might be to forget the whole thing and just use a IIe software emulator that runs...

I know what I am going to be working on tonight!

I just looked at Inside Mac 1, and was reminded of another fun use of the command key when dragging windows. Doing a command+drag lets you move a window without making it the active window. Oh, also, you may or may not know that if you hold down command key and click on the window title, it...

Yeah...but there was something more than that - like default behavior when passing false to SizeWindow()? It's nagging at me, but I just don't remember. I will just have to try it. Later, I guess.

Yes - somewhat dusty on my part. I haven't programmed in C for a long time. When I was writing the post, I almost remembered the parentheses, but I ignored that squeaking syntactic urge. :) Thanks - I will fix them. But, maybe a helpful error for this thread on learning how to program in C! :D...

The change I made was to clarify that the Finder is doing the restricting. I also think that there were other apps that followed the same restrictive vs. permissive model. And, to the point of that post, stretching windows beyond the width of their screens was originally frowned upon on...

I set up a 2-screen system in a Mac II, including a Spectrum/8 Series III in Slot $9 and a Thunder/24 in Slot $E, booting with a System 6.0.5 disk on FloppyEmu to verify the info from my original post above, which was a good 30-year trivia test! With respect to the way the Finder behaves and...

Haha - nice. Well...I may do *one more* FPU experiment with an MC68882RC33A (with a minimum operating frequency of 16.67Mhz that might just barely work). I am curious to know if it will work and if the much lower internal latency will dramatically affect the benchmarks. If it is possible to...

Yeah - I definitely have crusty C/Pascal crossover syndrome. :D Little things slip through. Thx. It's fixed.

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!