Lapis the Nevrean

@lapisnev

Don't squeeze me, I fart

she/her
dinobird.website/

Things that make you go 🤌. Weird computer stuff. Artist and general creative type. Occasionally funny. Gentoo on main. I play rhythm games!

You can post SVG files like photos on this website! Spread the word!

Lapis the Nevrean @lapisnev1/24/2023, 6:02 PM

walking mirage @atomicthumbs

walking mirage @atomicthumbs1/24/2023, 5:34 PM

Guide to the Macintosh® Family Hardware, 2nd Edition

Ever wondered what all those miscellaneous general logic ICs and PALs in your old Macintosh are up to? Curious about the IIfx's IOPs, each of which contained a 6502? Slavering to know how the video generation circuitry in the Macintosh Plus differed from that of the SE and SE/30? Baffled by the difference between an HMMU and a PMMU? No? Too bad here it is anyway

Cool fact: unlike every other Macintosh up to that point, the IIfx had completely software-defined per-slot/device interrupt priorities, because it was explicitly designed to also run operating systems other than the Macintosh System. The II could run A/UX if its owner installed a paged memory management unit, but the IIfx was purpose-built to be a 68030 workstation.

#Macintosh #retrocomputing

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in reply to @atomicthumbs's post:

cron mom @sophaskins1/24/2023, 9:09 PM

this is also a great reminder of the chronology of the models - I feel like for everything before ~2000 I wasn't old enough to be forming memories of which models existed at the same time, etc, but seeing things like this where the only models they can reference are the ones that exist at that time really nails it home

cron mom @sophaskins1/24/2023, 9:10 PM

and like, the breadth that they were going for early on. The IIfx predates the LC by a few months, and for the ~3.5x price, you might well have been getting more than 3.5x the computer!

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