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Re: [N8VEM-S100:2594] A new (V2) version of the S100 Bus System Support Board
I'm willing to organize an order for these boards. Are the final board
files done? Can I get them to organize a buy?
I want three in any case.
* monahanz <mon...@vitasoft.org> [140301 22:36]:
> Again back over 2 years ago Andrew and I put together an S100 bus “System
> Support Board”. This board was designed to allow one to analyze many of
> the hardware signals on the bus by “single stepping” the CPU, setting
> hardware breakpoints etc. It worked in the busses 16B address space with 8
> and 16 bit CPU’s.
> Like the MSDOS Support board, it has proven to be very popular and
> reliable. Many boards were already made and distributed to users. We
> decided to add a few small changes to the board to improve its
> functionality. We are calling this board the* “*V2 – System Support Board*”*.
> The changes include:-
> *1. Add a circuit to allow any combination of the four TMA0-3 lines to be
> activated. This allows up to 15 slave devices on the bus *
> *2. Latch all address lines for better display reliability with high speed
> CPU's *
> *3. Optimize the reset circuit *
> *4. Optimize the single step circuit. *
> *5. Add a circuit to ground address lines A16-A23 when (older) non IEEE-696
> CPU boards are the bus master. *
> *6. Switch to a 3A TO-3 voltage regulator *A brief description of the V2
> board can be found here:-
> (Bottom of the page).
> Like the MS-DOS support board, there will probably be some interest is in
> people obtaining a “commercial style” bare board like this. It would be
> great if we could get a volunteer to organize a group purchase of boards. I
> will definitely be getting 3 for myself. If you absolutely need one sooner
> rather than later let us know we can include you in the early “first
> batch”. Otherwise stay tuned for a later group purchase by (hopefully) a
> group member that will organize a larger purchase - at a lower price.
> Please note this is a two board set. Besides the S100 board, there is
> another board that contains three mezzanine boards for the Hex/LED bar
> displays and switches. If you already have the original (V1) board you
> don’t need the mezzanine boards as they will work with this V2 board as
> well. If you don’t then you will need the two board combination.
> Also if you already have the original V1 board, all the chips on that board
> can be transferred to this new board.
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