Those IDE boards are in fact a very simple boards. Essentially you are just talking to a 8255 three port chip. If you cannot write, you need to determine where the log jam is. Using a simple logic probe determine if the chip CS* lines is going low with a write. If WR* is going low etc. Single step through a simple continuous write loop in RAM. Eg:- Start: LD A, 33 OUT PORT_8255, A JMP START Follow the signals. Change ports, repeat. Switch to reading ports, same thing… If you have a digital logic probe look at data lines, triggered with each read/write. By now there are well over 100 of these boards out there. It must be some glitch in your system Good luck John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] Hi Jeff -- >> Had some time to work with my v.3 IDE/CF card today after completing assembly. >> - Can MYIDE.COM run on an 8080 or 8085 CPU? >> - Can MYIDE.COM run under cp/m 2.2? cp/m3 NOT required for MYIDE.COM test / utility program? >> Has anyone, maybe Bob Bell, ever run the MYIDE ROM on the California Computer Systems (CCS) 2810 Z80 CPU? -- |