phils@tekigm2.TEK.COM (Philip E Staub) (10/27/87)
[ Place all un-important text here ] Has anyone ever posted a summary of the electrical and mechanical differences between the Zorro I and Zorro II bus specs? If not, could someone do so? If so, could someone e-mail me a copy? Thanks, Phil
daveh@cbmvax.UUCP (Dave Haynie) (10/27/87)
in article <2337@tekigm2.TEK.COM>, phils@tekigm2.TEK.COM (Philip E Staub) says: > > Has anyone ever posted a summary of the electrical and mechanical > differences between the Zorro I and Zorro II bus specs? If not, could > someone do so? If so, could someone e-mail me a copy? > > Thanks, > Phil Electrical Differences are simple: Pin Zorro-I Zorro-II 20 RESERVED -12V 40 /IPL0 /EINT7 42 /IPL1 /EINT5 44 /IPL2 /EINT4 96 RESERVED /EINT1 The -12V designation did appear on some later Zorro-I specs. The "/IPLn" lines are encoded 68000 interrupt lines that are an input to the 68000 from the Paula chip. These are inputs only from the point of view of the PIC. The "EINTn" lines are unencoded interrupt lines, which may be asserted with an open collector device on a PIC. The /IPLn lines in an A2000 are moved to the Coprocessor Slot to support add-on processors, such as 68020s, the only type of device that's going to be able to use these signals. -- Dave Haynie Commodore-Amiga Usenet: {ihnp4|caip|rutgers}!cbmvax!daveh "The B2000 Guy" PLINK : D-DAVE H BIX : hazy "Computers are what happen when you give up sleeping" - Iggy the Cat