Recent content by bear

Awesome! Thank you so much.

Has somebody archived a copy of the Powerlogix G3/G4 cache profiler? Every single Google search I've tried has produced results that all point back to the same dead link at powerlogix.com. I think even an older version would do me as I'm working on a beige G3 MT. Thanks!

The first one is a II+ board. The bottom one has the characteristics of a II board, but some went into II+es so without seeing more details I don't think anybody can say that it definitely didn't come out of a II+. In either case, I don't know why it matters. If chip swapping is your aim, the...

Just for the record, it's perfectly sensible to hook a drive for an old mac up to a new mac running OS 8 or 9 or whatever, boot the new mac normally, then chuck the 7.5 CD or 7.1 floppies or whatever in it and use the installer to install the old OS to the drive for the old mac. You don't have...

These paper caps are typically safety rated (for failure mode, this is what the "X" or "Y" or "X2" means), and the poly ones frequently aren't rated the same way. Be cautious.  http://www.kemet.com/Lists/Filestore/EvoxRifaRFIandSMD.pdf

"interleave 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16" means it is formatted with 17 sectors per track, with a 1:1 interleave (sectors numbered in rotational order).

I have one. It says "Macintosh II" on the front, has a IIfx board and an injection molded plastic plate that says "Macintosh IIfx" with the corresponding model number, copyright and FCC info, etc. stuck over the place where the original bottom tub molding says "Macintosh II" and the rest of it...

Check the felt pad where the upper head would be if it were a double-sided drive. I've seen more than a couple where these had fallen out. It's also possible for them to wear to the point it goes out of conformance.

IME the case cracker is fairly well a necessity the first time one of these cases is opened (as in, since leaving the factory). Once it's been opened the first time, gravity and a little wiggling is enough to get the bucket off every time after.

I don't recommend "hot plugging" anything on the floppy port, ever, because in my experience this is an outstanding way to blow out the IWM.

I never found much "official" info on the topic, but the HD20 does not work at all on the 128k, INIT or no. There just isn't enough memory available. edit: On further reflection I suppose it is at least theoretically possible that a Plus ROM swap would solve that problem.

Trag basically wrote the correction post I was writing, and beat me to posting it. It's in the Q605 thread.

There's a table of what is and isn't supported with the HD20, in the Apple Guide to the Macintosh Family Hardware. Table 2-1 Non-SCSI disk drives used by Macintosh computers ============================================================================================================= Computer...

Er, no, 8 4Mx1 chips isn't going to work for bank A in a IIsi. You have installed an 8-bit wide memory; 24 data lines are not connected to anything, even assuming the rest of the pinout is the same (which I doubt). I've been posting too late at night and some of the other things I wrote about...

Ah. I just realized you're referring to the DRAMs as 2 megabyte chips, which I suppose is technically correct, as their total capacity when measured in 8-bit bytes is 2048 KB. But this is a misleading designation, because there are other--incompatible--ways to get a 2 megabyte DRAM, such as 1...