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RE: [N8VEM-S100:7255] Re: Possible 8086 board run
Unfortunately configuring a this board to come up as a IEEE-696 master (rather than a slave) is not a simple splice. The transfer of control has to take place sequentially and carefully. See the write-up here
http://s100computers.com/My%20System%20Pages/80286%20Board/80286%20CPU%20Board.htm
Go down to "Configuring the 80286 as a Bus Master with Slave/DMA controllers" for an example.
I'm really reluctant to plunk is a similar circuit without a prototype run. History has thought me "quickies" don't work.
BTW remember you can bring this board up as the only CPU board in your system (i.e. it will boot as "the CPU" on power on), it's just it will not be able to transfer control to another CPU/DMA device.
Gary put me on the list for two boards if you do a run
John
-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Gary Kaufman
Sent: Thursday, June 18, 2015 5:04 PM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:7255] Re: Possible 8086 board run
Greg -
The only revisions made are the changes to the silkscreen and regulator. It works fine as a slave, and I suspect most of us won't need to use it as a master.
John's tied up with some more significant projects, and sadly I lack the sophistication to make any of these changes.
It should be similar to the 8088 board - which works very nicely.
- Gary
On 6/18/2015 7:10 PM, G. Beat wrote:
> Gary -
> Are you planning revisions (noted by Todd) to use as a Master/Slave on the S-100 bus??
>
> gb
>
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