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<whitequark> huh, 100BASE-T4 is pretty wack
<gruetzkopf> yep
<gruetzkopf> hm, $chinese_ebay_seller was fast, the cursed 8051s arrived yesterday
<GenTooMan> what?! 8051 well at least you can get a compiler for it.
<OK_b00m3r> true!
<OK_b00m3r> why are they cursed gruetzkopf
<sensille> oh, i still have some, i think. and 8049
<GenTooMan> probably because the arch has been replaced by something easier to use and more straight forward the 8049 was definitely cursed
<GenTooMan> I only had to touch those to make a assembly traslator for ancient product
<OK_b00m3r> fair enough. i have no 8051 exp, just pic18, atmel 328, arm cortex-m0+ mainly
<GenTooMan> bank switch IO and program space crazy pointers and a tiny stack (128 bytes max)
<sensille> (only found 8749 in my box)
<gruetzkopf> people i know have a whole bunch of MCS-48 parts in production still
<gruetzkopf> (and i also commonly see 8085 with more than 2 MByte of banked memory.. (64k address space!)
<whitequark> 8051 is still not as bad as 8-bit PICs
<GenTooMan> very true newer pics are OK but not that fun (IE they aren't a nice address space like ARM)
<whitequark> also, you don't bank switch IO on 8051
<whitequark> you have register banks (only really useful for interrupts, and marginally at that), and if you need more than 64K of code or RAM, some system-specific way to bank that too
<GenTooMan> I think what I meant was memory mapped IO with bank switched memory. I try to forget these things.
<whitequark> not in the base 8051 arch, no
<whitequark> maybe you had a variant that specifically did it
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<whitequark> hm
<whitequark> how come 100BASE-T2 implements collision detection if it's full duplex over both pairs?
<whitequark> doesn't that mean it can't have collisions by definition?
<whitequark> is that for... hubs?
<whitequark> also, what the heck is 100BASE-TX half duplex?
<mwk> well if you have a 100BASE-TX
<mwk> that is perfectly capable of doing full duplex
<mwk> but you really really want to feel that half duplex experience
<mwk> you can turn it on
<mwk> also, yes, hubs
<mwk> in theory you can have those on 100BASE-whatever
<whitequark> I'm not even sure where 802.3 defines 100BASE-TX half duplex
<whitequark> like, it sure *refers* to it a lot
<whitequark> their idea of "let's define 100BASE-TX in terms of FDDI but also replace all terminology with that from 10BASE-T" is also not confusing at all
<whitequark> oh i see, 100BASE-TX half duplex is still, well, half duplex, in that it uses two pairs, unlike 10BASE-Te, which is simplex
<whitequark> so *that*s why you can have a passive 10BASE-T hub but not a passive 100BASE-TX hub
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