Thanks Gary, Sorry guys, I meant to send that last message only to Gary, I sent him on a prototype SBC board. While on that topic, during the debugging of this one (see:- http://s100computers.com/My%20System%20Pages/SBC%20Z80%20Board/SBC%20Z80%20CPU%20Board.htm) I have been rethinking what to put on such a board that would be most useful for first time S100 bus users. I now thinking of dropping the Propeller VGA/keyboard section and replacing it with just the USB port “chip” . This way anybody can communicate with their system initially from standard PC/Telnet software or this PIC32 board. In its place I would drop in the equivalent of the IDE/CF Card board. The board has 60K RAM, 4K ROM, IOBYTE port and a Z80/S100 bus circuit. The board actually has 128K of RAM (2X64) but I cannot figure out how to switch banks without blowing the software out of the water for CPM3. Sure I can do so within the ROM but how do you get stuff across from one bank to another. Anybody seen this done. Normally you have a 16 or 32K window that switches. Hate to settle for a 60K non banked CPM3 system! John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of John Monahan Hi Gary, Just about to order the blank chips from Mouser. However the PIC32MX250F128 listed here:- seems wider than on the circuit board in Geoff’s article. Do I have the wrong one. Will also order a programmer. I’m try to figure out if I go that route on the SBC-Z80 board what would be the best way to get data to and from the S100 bus itself. If I understand it correctly I would have to have a serial port/chip on the board. Is the “TTL Serial” (pins 5 & 6) compatible with say a 5V Zilog 8530. When you add that as well as buffers etc. the board circuit real estate mounts up. What would be nice if a PIC with a parallel port type pins was programmed/set up to go directly to a local bidirectional board bus as I have with the propeller circuit. BTW, I’m having problems at the moment getting the Propeller circuit to recognize/output characters. There are a number of minor errors on the board. I will outline to you in a day or two still a work in progress! John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Gary Kaufman I had a small batch of PC boards made up for the PIC32 Ascii Terminal from http://geoffg.net/terminal.html -- -- |