mirrorbird (03:46:40)
my vague understanding is that in USR0 mode you get all the memory but some annoying 128k features are locked out so you can run code faster. ahahah that's probably bullshitty, we need a russian here to tell the truth

mirrorbird (03:46:03)
USR 0 does a system reset into "sort of" 48k mode (but different from actual switching to 48k mode, because that totally locks out the 128k paging so you lose your extra memory)

mirrorbird (03:45:32)
USR is the basic command to call a machine code routijne, you know, like PRINT USR 32768 and you get the result back

velusip (03:44:27)
HP-85 has some really weird CLI conventions as well. I'm familiar with the C64, but what's the "USR0" stand for?

velusip (03:43:01)
As the kids say, "Weird flex, but okay." We nerds are huge credit whores. It's always been that way.

mirrorbird (03:42:08)
one of those questions. like "why do you type 8,1 when you load a c64 game"

mirrorbird (03:41:59)
128k speccy demos are usually run in (semi) 48k mode for some nerd reason i only half understand... i never even though about it until some guy at a party said "why do you type USR0"...

mirrorbird (03:40:47)
it's "showoffy" as rapture would say big part of demoscene

mirrorbird (03:40:27)
its the ultimate non-portability

mirrorbird (03:40:23)
like you've only got 8 bytes to do something, it's usually impossible but you know that the undocumented/unused instruction 0xEB will do whatever and dump something in some register...

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