Xref: utzoo rec.arts.sf-lovers:49289 alt.cyberpunk:4939 comp.arch:19101 Path: utzoo!utgpu!cs.utexas.edu!usc!apple!goofy.apple.com!esmith From: esmith@goofy.apple.com (Eric Smith) Newsgroups: rec.arts.sf-lovers,alt.cyberpunk,comp.arch Subject: 6502 interrupts (was Re: Count Zero Interrupt) Message-ID: Date: 9 Nov 90 01:48:51 GMT References: <1427@carol.fwi.uva.nl>, <4bC2VW600VIE094FUA@andrew.cmu.edu> Sender: usenet@Apple.COM Organization: Frobozz Magic Widget Company Lines: 17 In-reply-to: ap1i+@andrew.cmu.edu's message of 7 Nov 90 22:54:24 GMT In article ap1i+@andrew.cmu.edu (Andrew C. Plotkin) writes: > I dearly love my old Apple 2; but I have to admit that the 6502 handles > interrupts the way a drunk gorilla handles fine china. The 6502 handles interrupts just fine; it is the Apple II that handles them badly. The design philosopy was apparently the same as that of Doc Suding (sp?) of The Digital Group fame (anybody remember them?): interrupts are hard to understand so you shouldn't use them. In the case of the Apple II and Apple II+, the monitor ROM made it almost impossible to do useful things with interrupts. Newer machines were slightly improved in that respect. -- Eric L. Smith Opinions expressed herein do not necessarily reflect those esmith@apple.com of my employer, friends, family, computer, or even me! :-)