Well, note that John states that he wasn't able to achieve stable
performance @15MHz ("The board with an AMD 80C286-16 CPU I could get the
board to run in my system with a 15MHz Oscillator "most of the time".
However I normally run the board with a 12 MHz AMD N80L286-12 (no I/O wait
states), with on-board 28C256 EEPROMS or off-board EEPROMS on the MS-DOS
support board. At this speed the board is absolutely rock solid.") and the
S-100 bus does "top out" around 12 MHz. Adding wait states might get you
to 16+ on the CPU. John doesn't mention whether he tried trading
wait-states for CPU speed. Experiment!
On Fri, May 9, 2014 at 6:43 AM, David Fry <[email protected]> wrote:
> John / Paul,,
>
> have a look at the attached datasheets, looks like Siemens did faster
> versions of the 80288 and 80284 support IC's.
> Would they work on our 80286 boards at maybe 16Mhz~ 20Mhz with a 20Mhz
> CPU?
>
> regards
>
> David Fry
>
> On Saturday, April 26, 2014 6:58:19 PM UTC+1, monahanz wrote:
>
>> Hi everyone,
>>
>>
>>
>> I'm going to quickly do a “Production” run of the V2-80286 Master/Slave
>> CPU board. This is a rework and upgrade of the original 80286 board. The
>> differences/improvements are listed towards the bottom of this page.
>>
>>
>>
>> http://s100computers.com/My%20System%20Pages/80286%
>> 20Board/80286%20CPU%20Board.htm#V2-80286
>>
>>
>>
>> This is a fairly complex board and probably not for some to start with in
>> the 16 bit S100 arena. However it may be some time until we do another
>> run.
>>
>>
>>
>> I will be traveling (again) soon, so I would like to get the order out
>> early next week. Please let me know if you would like one or more boards
>> (via e-mail to monahan AT vitasoft.org).
>>
>>
>>
>> Also please it is lightly we will be below the normal number of boards
>> (20) to get the low $33 price, could be 2X that. If that is a problem
>> let me know.
>>
>>
>>
>> John
>>
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