Hi Andrew, please put me down for one also. I will PP you shortly. Thanks!
Max Sent from my iPhone > On 6 Jan 2014, at 7:39 am, "Andrew Lynch" <[email protected]> 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] 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. -- 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.
