Hi Andrew, Adopt a board, Mmm that could work too.. Could you give us some idea of what the costs would be up front to order and sit on a batch of 10, 20 or 50 boards etc.. I'm guessing that people may adopt boards thay actually need so I may be interested in adopting the ZFDC or the MSDOS support board, just need to know the costs before committing as I dont have a regular job. regards David Fry regards On Sunday, January 5, 2014 8:39:03 PM UTC, lynchaj wrote:
> Hi! > > > > We are about to do another run of our popular S-100 Bus Z80 CPU V2 board. > This board can run in systems (with bus termination etc.) at up to 10MHz. > Apart from all the then common features found on many older S100 Z80 > boards (and being completely S-100 IEEE-696 compliant), it had an extremely > clever and powerful ability to allow the Z80 to address up to 1 MG of RAM > in 16K "windows" within the Z80's address space. This is described here:- > > > > > http://www.s100computers.com/My%20System%20Pages/Z80%20Board/Z80%20CPU%20Board.htm > > > > Its primary importance is that it can be used to address greater than 64K > of RAM for CPM3 and that it can be used to load/examine 8086 code at the > top of the 1MG address space. > > > > The new “V2” version of the board now has the ability to (under software > control) dynamically switch between two 4K blocks of code in its onboard > 28C64 EEPROM (or EPROM) yet still only occupy 4K in the Z80’s 64K memory > space. This in effect almost doubles the size of a possible Z80 monitor. > The extra code (currently being written) will include things like directly > downloading binary files from a PC into the Z80’s 64K (or 8086’s 1M) > address space. > > > > In addition, the S-100 Z80 CPU V2 has the ability to use an external CPU > clock from an external source (S-100 bus pin 66 aka NDEF3). This is > essential for CPU to video synchronization for MSX compatibility > particularly in games. There will be a corresponding ability to export a > CPU clock signal on the next version of the S-100 VDP board although this > could come from any S-100 board. > > > > Current owners of the V1 board can just switch the IC’s to this new bare > board. > > > > The S-100 Z80 CPU V2 PCBs will be $20 each as per the usual arrangement. > Shipping in the US is $3 for a single PCB and $2 for each additional PCB. > Shipping internationally is $12.75 for a single PCB and $3 for each > additional PCB. This is for the bare basics USPS first class postage with > no tracking or insurance. The builder assumes all risk of delivery as per > usual arrangement. > > > > My preference is to sell these PCBs to vintage computer/home brew > computer/classic computer hobbyists first but if there are any remaining > boards I will put them on eBay. > > > > Please send a PayPal to [email protected] <javascript:> with the subject > “S-100 Z80 CPU V2 board” and I will reserve your board(s). I need about 20 > pre-orders to warrant a manufacturing run. I will post more information as > it becomes available. > > > > Thanks and have a nice day! > > > > Andrew Lynch > -- 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.
