Intel iSBC 86/12 Single Board Computer

I obtained this board off eBay. It contained non-Intel EPROMS which make it more difficult to get operational.


This board has suffered some damage. It was missing a crystal used in the baud rate generator. I have ordered a replacement. I am still trying to find a copy of the original Intel ROMs for this board. Without those, I will have to develop my own monitor.

I can't emphasize how important it is to have the Hardware Reference Manual for each board. Nothing is better than having the configuration information for jumpers and the schematic diagrams. The complete reference manual is here. Just the schematic set for the iSBC 86/12 are here.


1505 MST 16 December 2011

I have developed a Monitor ROM from the 8080 Monitor I used on the iSBC 80/10 board. I have programmed it into two 2732 EPROMs for this board. I have used the HP 1650B Logic Analyzer with a 40-pin ChipClip to monitor the 8086 operation. It goes to high memory correctly, and reads in the far jump there, but does not actually perform the jump. We may have a bad 8086 processor. All the ROM work is here.


1409 MST 6 January 2012

I am using an 8086 probe for the HP1650B to figure out what is wrong with this board. The probe is discussed on the 8086 Probe page under Test Equipment and Adapters on the Main page.


1213 MST 13 February 2012