Thread View: comp.sys.m68k.pc
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2 total messages
Started by Thomas Ng
Wed, 07 Feb 1990 13:02
Re: More questions about building a 68K system
Author: Thomas Ng
Date: Wed, 07 Feb 1990 13:02
Date: Wed, 07 Feb 1990 13:02
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>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. Thomas
Re: More questions about building a 68K system
Author: Alan Percy
Date: Fri, 23 Feb 1990 13:37
Date: Fri, 23 Feb 1990 13:37
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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
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