Re: [N8VEM-S100:3558] Re: Group order for S100 V2 80286 Master/Slave CPU Board

Subject: Re: [N8VEM-S100:3558] Re: Group order for S100 V2 80286 Master/Slave CPU Board

Date: Fri, 9 May 2014 07:25:16 -0400

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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 <dgf...@googlemail.com> 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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