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Re: [N8VEM-S100:1544] An 80386 CPU and RAM board for tthe S-100 Bus
I'd like three of each board.
* monahanz <mon...@vitasoft.org> [130415 22:52]:
> I would like to mention that Andrew Lynch and I have just completed work on
> the final prototype (V4!) of a new 80386 Master/Slave CPU S-100 bus board.
> This board is capable of reaching up to36MHz for its clock input when used
> with RAM on its daughter board (see below).
> For those that have been following progress this has been a long project. It
> utilizes the 16 bit mode of the 80386 to address up to the 16MG of RAM the
> S-100 bus is capable of addressing. A second daughter board system with two
> overhead ribbon cable connectors is utilized to allow 32 bit addressing to
> one or more RAM boards. This "32-Bit S-100 Overhead Bus" as I call it,
> allows the CPU to run at its maximum speed (no wait states) and with the
> current static RAM chips in pipeline mode. The current daughter RAM board
> utilizes 16MG of static RAM. The plan is to next add high capacity DRAM
> It turned out that the 80386 splices very nicely into the S-100 bus. The
> CPU control signals are clean and tolerant. In fact the interface is
> simplifier than our earlier 8086 and 80286 boards. No bus controller or
> clock generator chips for example are needed.
> The real fun in working with this chip is now one can take advantage of the
> 32 bit programming mode of the 80386 and its vast memory addressing
> capability. It took some time to understand how to switch the CPU into
> ?protected mode? and I have written this up to make it easier who may like
> to start into this world for the first time.
> For those with S100 systems that would like to get into 32 bit system
> hardware and software this board may be a great place to start. In the
> next few weeks we will be sending an order in for a production run of both
> bare boards. In all lightly-hood this will be a onetime batch/order, so
> if you think you would like to play around with a board like this in the
> future, now is the time to order a board. Also I should point out, this
> board is fairly sophisticated, I would not recommend it for people starting
> off with S100 boards. They should ?cut their teeth? on say the 8088 CPU
> board first.
> For more information about both boards please see here:-
> For information about 80386 Monitor software please see here:-
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