Thanks Neil! That’s great news! Fantastic! Tremendous progress! I really appreciate all your effort and I think this is going to help a lot of builders. Just what you have fixed so far would make a useful board to help boot a bare S-100 CPU! Thanks for the many updates to the wiki page and those are looking really good. I am looking forward to the next version of the S-100 Utility board with all the improvements and fixes included. I think we are getting close to be able test an actual MSX CBIOS implementation. Dan Werner had one working on the N8VEM ECB system and I am thinking it would be a good starting point. In the S-100 Utility board design some of the actual peripheral connections were kind of uncertain. I am not sure how the cassette logic is supposed to work so hopefully we can get some help from the MSX gurus. The matrix ASCII keyboard is kind of a mystery too. It is not parallel ASCII but uses some kind of capacitive sense logic. There might be a standardized part they intended for the keyboard but I was never able to get to the bottom of it. My hope is the S-100 Utility board would be not just an MSX2 implementation for the S-100 bus but also a generally useful bootstrapping board. Only the MSX requires Z80 but the RAM/ROM/PPI/UART logic is usable by any 8 bit CPU on the S-100 bus. Although a 6502 based MSX computer is kind of a bizarre concept! J Thanks and have a nice day! From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of nbreeden Status of my MSX2 Utility Board build. I've made enough progress on the board be able to run a simple monitor out of the on-board EPROM. I've had to make 2 changes to the board for this. These changes are documented in the file area under "Builders Journals\Neil B" Based on my work I believe the following are working (based on the fact that my monitor is running out of the utility board EPROM/RAM using the UART to communicate). * 8255 PPI * 16550 UART * 32K EPROM at $0000-$7FFF * 32K RAM at $8000-$FFFF Still waiting to be tested: * Printer Interface * RTC * Slot Selection Logic * Remaining 32K RAM (mapped in the slots) -Neil -- |