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- Path: grapool30.rz.uni-frankfurt.de!news
- From: raftopou@stud.uni-frankfurt.de (Joerg Raftopoulos)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Zorro (Dave Haynie Please?)
- Date: 13 Mar 96 21:13:20 +0100
- Organization: J. W. Goethe-Universitaet Frankfurt/Main
- Message-ID: <2070.6646T1273T1020@stud.uni-frankfurt.de>
- References: <1677.6639T1182T1504@plea.se> <2247.6643T942T2652@stud.uni-frankfurt.de> <2802.6643T1326T1797@plea.se>
- NNTP-Posting-Host: dialin143.rz.uni-frankfurt.de
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP) *UNREGISTERED*
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- OL>>> I have a question about the "DOE" signal in the bus, in "A500/A2000
- OL>>> technical reference manual" it says that this signal is ment to be used
- OL>>> to enable the buffers on the expansionsion board (PIC), and also it say
- OL>>> that the timing on this signal changes if the buscycle is a read or
- OL>>> write cycle. The "RKRM: Hardware" does not give me any more clues
- OL>>> either.
-
- JR>> i quote from amiga hardware reference manual 3rd edition (you should buy
- JR>> this reference manuals series. it`ll answer all of your amiga related
- JR>> questions) page 415:
-
- OL> If you read a couple of lines above, you will see, that I already have it
-
- excellent! you can rely on rkm hardware edition 3. previous informations,
- including developer material weren`t finished or had severe bugs. i guess you
- already know that implementation of zorro bus changed (termination, terminated
- signals, driver types) with different amiga 2000 board revisions. zorro2
- implementation has been (in amiga 2000/2500) somewhat flaky, e. g. i couldn`t
- swap the sequence of my expansion cards, otherwise the A2000 system wasn`t
- stable.
-
-
- JR>> if you understand german you can find a working zorro2 autoconfig design
- JR>> including schematics and pal equations in the c`t magazine (november
- JR>> 1989, pages 266 to 272). it`s used for a transputer link interface. some
- JR>> general amiga information you`ll find in march/april 1990 mags. check
- JR>> also c`t www pages at http://www.ct.de
-
- OL> OK, I understand german enough to read an article, not enough to make a
- OL> conversation :)
-
- that`s your advantage. i can`t even order two beers in sweden hehehe
-
- OL> I don't think I need it that bad. I will probably sort it out anyway...
-
- if you like i`ll scan the schematics of the pic and mail it to you.
-
-
- bye!
- jr.
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-
-
- SOL LUCET OMNIBUS
-
- Joerg Raftopoulos, Amiga User since 1987
- 3 x A1000, 1 x A500, 2 x A2000, 1 x A1200, 2 x A3000 Owner
- Student at J. W. Goethe Universitaet, Frankfurt am Main, West Germany, Sol III
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