assembler, disassembler for Intel 8089?
cclist at sydex.com
Fri Sep 25 13:22:05 CDT 2015
On 09/25/2015 09:56 AM, Al Kossow wrote:
> What I/O board are you trying to figure out, Eric? A bunch of
> different manufacturers early Multibus Winchester controller boards
> used them.
The 8089 was a good idea but badly timed and terribly underpowered. 2
channels of DMA, while a plain old 8257/8237 could give you 4. When the
80186 was being sampled, it too, had 2 channels of 20 bit DMA on-chip,
so why fool with another chip. In the meantime, RAM prices were headed
lower, so having private RAM for an I/O device (e.g. hard disk) made DMA
Good idea, wrong timing. When I approached "Fast Eddie" our Intel sales
guy, he gave me a bunch of documentation on the 8089 and told me that it
wasn't worth looking into for a design. This was about 1980.
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