Interested in 2x boards... Wow, this is a great time for N8VEM S100 On Mar 2, 2014 5:56 AM, "monahanz" <[email protected]> wrote:
> About September of last year Andrew and I put together an S100 bus > Master/Slave 80286 CPU board. This board was designed to allow one to run > CPM86 and MSDOS in the S-100 bus. > > As we started to consider and plan for future CPU's for the bus and > software/hardware to run with them, it became clear that it would be > nice to have the capability with CPU's in slave mode to transfer control > down one more level. This would allow you to run a slave with for > example a DMA controller, or temporally pass control to another CPU without > going up a level and program the bus master to take care of things. > Particularly > because in almost all cases the bus master would be a slow 64K Z80 CPU. > > The approach used was to simply duplicate the IEEE-696 protocol again > using two unassigned S100 lines (NDEF1 & NDEF3). Keeping the same > handshaking protocols etc. We implemented this with our 80286 > master/slave CPU board here and are calling this the V2-80286 CPU board. > > A brief description of this V2 board can be found here:- > > > http://s100computers.com/My%20System%20Pages/80286%20Board/80286%20CPU%20Board.htm#V2-80286 > > (Bottom of the page). > > This is probably the most complex board we have done to date, definitely > not for everybody! It should not be attempted by somebody starting off > with these types of boards. > > I will now go ahead and get a few (3 or 4) commercial quality boards made > for my own use. If you think you are up to utilizing a board like this > now, or in the future, let Andrew or I know so 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. > > Note, if you already have the original V1 80286 board, all the chips on > that board can be transferred to this new board. > > BTW, all our planned future 16 and 32 bit CPU's will incorporate this new > circuit/protocol. > > -- > 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 [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
