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From: valentin@public.BTR.COM (Valentin Pepelea)
Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga.programmer
Subject: Re: Accessing BUSY, SEL, and POUT via "parallel.device"?
Keywords: Parallel, centronics
Message-ID: <2375@public.BTR.COM>
Date: 13 Apr 91 05:39:14 GMT
References: <1991Apr12.165832.12620@jarvis.csri.toronto.edu>
Followup-To: comp.sys.amiga.hardware
Distribution: na
Organization: BTR Communications, Mtn. View, CA
Lines: 33

In article <1991Apr12.165832.12620@jarvis.csri.toronto.edu>
leblanc@eecg.toronto.edu (Marcel LeBlanc) writes:
>

You're Canadian, so you deserve a prompt answer.

>The parallel port on the Amiga (and other computers) includes a few
>bi-directional I/O lines other than the 8 data lines (BUSY, SEL, and POUT
>connected to the 'other' CIA device).  Is it possible to read and write
>these using the parallel.device, or is it necessary to write to CIA A
>directly?  I have the 1.2 Libraries and Devices reference, but it doesn't
>mention anything about this (unless I missed it, of course).

It is not possible to twiddle these pins using the parallel device. You would
have to access the hardware directly, after allocating the parallel port and
bit resources.

>I am building a ROM emulator for my hardware prototyping (which I do
>regularly), and I'd like to be able to quickly transfer the ROM code to the
>emulator via the Amiga's parallel port.  Since I'm using the Amiga for all
>my software development, it makes sense to plug the emulator into the Amiga
>for instant ROM updates (and not some dumb clone).

That's a fine use you have in mind, but what do you need these three extra
lines for? These lines are otherwise used for handshaking, as per the
Centronics standard. (if you can consider it a standard)

Valentin
-- 
"An operating system without virtual memory      Name:      Valentin Pepelea
 is an operating system without virtue."         Phone:     (408) 985-1700
                                                 Usenet:    mips!btr!valentin
                     - Ancient Inca Proverb      Internet:  valentin@btr.com