Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!moscom.UUCP!adp
From: adp@moscom.UUCP (Alan Percy)
Newsgroups: comp.sys.m68k.pc
Subject: Re: More questions about building a 68K system
Message-ID: <2024@moscom.UUCP>
Date: 23 Feb 90 13:37:11 GMT
References: <1990Feb7.130224.13025@bath.ac.uk>
Sender: mwm@ucbvax.BERKELEY.EDU
Reply-To: moscom!adp@cs.rochester.edu (Alan Percy)
Organization: Moscom Corp., E. Rochester, NY
Lines: 23
Approved: info-68k@ucbvax.berkeley.edu


In article <1990Feb7.130224.13025@bath.ac.uk> eephltn@gdr.bath.ac.uk (Thomas Ng) writes:
>>Well, You could always pick up the parts for a nice PT-68K and assemble
>>a 12.5 MHz 68K single board computer and get the new OS9 68K port to support
>>oodles of memory... it has a IBM PC compatable bus and will run most standard
>
>Is PT-68K really a NICE computer ? If my memory serves me right, PT-68K hasn't
>got any DMA on it.
>
As a matter of fact, no interrupts either.  The PC bus is really best
suited for memory or graphics cards.  By adding a few diodes you can
add all the interrupt lines from the PC bus to one 68000 interrupt.
We had to do this to get a HardCard running on my friend's PT68k.

He can now use PC modems and serial cards too.

Besides all these points, the PT68k with the OS9 implementation
provided runs reasonably well.  The floppy could be faster and DMA
would be nice, but for the price what the heck.


-- 
Alan Percy..........................{rutgers,ames,cmcl2}!rochester!moscom!adp