Re: [N8VEM-S100:7751] A New Single Board Z80 based S100 bus board is now available

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

I'd like three please John.

Thanks,

Todd

* monahanz <mon...@vitasoft.org> [151017 14:49]:
>  
> 
> I’m glad to report that the 2nd prototype version of our Z80 based S100 Bus 
> SBC seems to be working fine.  This S100 board has a Z80A on board with 
> 128k of RAM, and 8K (or 4K) of EEPROM.    It is geared for first time S100 
> bus users to get a basic system up and running. The board has a USB socket 
> to communicate with a laptop/PC as a serial I/O terminal.  The board has an 
> IDE Port to use with a CF-CARD Adaptor to run an operating system such as 
> CPM.   Because the lower 32K of RAM can be switched with another 32K of RAM 
> the board should work well with CPM3.   There are is an onboard IOBYTE port 
> to redirect data I/O to (for example) our S100 bus Console I/O board.  There 
> are numerous jumpers to reconfigure the board. Things like inactivating the 
> onboard RAM, ROM, IDE port etc. to gradually add other S100 boards to your 
> system.    The “BASE_PORT” for a range of the boards’ eight  I/O ports is 
> configurable (0-255).  There is a Power On Jump (POJ) circuit to the 
> onboard EEPROM at any 4K boundary.  The Z80/S100 bus interface circuit 
> seems to work with all (old) S100 bus RAM boards I have (~10), even DRAM 
> boards like the IMS 64K board as well as all I/O boards I have.   This is 
> at 4 or 5MHz (no wait states).
> 
> While the board will act as a master/slave S100 board it’s not really 
> intended to function is a complex multiprocessor configuration. For example 
> for debugging you cannot “see” beyond 64K of RAM in the bus.  However you 
> can actually transfer control over to our slave 8086 CPU board.  
> 
> I have written a basic Z80 monitor with the usual Zapple/Master commands.  There 
> is an XModem command to download files from your PC (via the USB port) and 
> run in the boards RAM (at any defined location).   There are commands to 
> read, display and write multiple sectors to/from the onboard IDE/CD Card.  Because 
> of time constraints, I have NOT written a CPM/CPM3  BIOS etc. to run the 
> operating system from the board.   Everything you need is there; hopefully 
> somebody can do this and have it available for all.  See the S100Computers 
> Software page to get started.    There is a basic BOM list there also.
> 
> A description of the board can be seen here:-
> 
> *http://s100computers.com/My%20System%20Pages/SBC%20Z80%20Board/SBC%20Z80%20CPU%20Board.htm* 
> <http://s100computers.com/My%20System%20Pages/SBC%20Z80%20Board/SBC%20Z80%20CPU%20Board.htm>
> 
> I will be doing a batch of (gold plated) production boards soon. If you 
> would like one or more boards please let me know.   To do so please go to 
> the bottom of the above web site page and sign on to the Google Groups 
> forum to handle this.  
> 
> -- 
> You received this message because you are subscribed to the Google Groups "N8VEM-S100" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.