Re: [N8VEM-S100:2594] A new (V2) version of the S100 Bus System Support Board

[Todd Goodman <t...@bonedaddy.net>]

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.

Thanks!

Todd

* 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:-
> 
> http://s100computers.com/My%20System%20Pages/SMB%20Board/S100%20Bus%20SMB.htm#V2-SMB
> 
> (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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