There has been significant progress over the Holidays. All the Basic Instruction Diagnostics now execute successfully. Many of the Advanced Instruction Diagnostics also execute successfully - the Advanced Diagnostics that fail, do so because they require support from the Diagnostic Monitor (SMMON) which is not 'linked in' at this time. I have a design roughed-in for a RH-11 Massbus Controller supporting 8 RP06 Disk Drives. All 8 RP06s disks use a single 8GB Secure Digital (SD) Disk Card for media. There is still a lot to do before the Disk IO will be ready to test. I've also implemented an DZ-11 8-port Terminal Multiplexer, and the KS10-Backplane-to-Unibus IO Bridges. If anyone knows where to find the KS10 DZ-11 Diagnostic DSDZA Source code, please contact me. I have verified that I can use the same 'bits-on-disk' format as SIMH. That will allow the KS10 FPGA to use any of the freely available disk images without modification. You also should be able to use the SIMH Tape IO facilities to create your own disk images. For complete information, please visit: http://www.techtravels.org/KS10FPGA/ Rob Doyle doyle (at) cox (dot) net