Chip Upgrades for 11/23 (was Re: 11/03 system on eBay sold)

Thanks for clearing that up... I've not used cobol on the -11. I figured it was like other optional instruction sets with regards to layered products... like Basic, which comes in the NHD (no hardware), EIS (for machines with EIS) and FPU (for machines with FPU). The problem is when you run the EIS or FPU version on a machine which doesn't have the required hardware... it doesn't work. NHD will work everywhere since the code it generates uses the basic pdp-11 instruction set. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | email: mbg at world.std.com | | | | | "this space | (s/ at /@/) | | unavoidably left blank" | URL: http://world.std.com/~mbg/ | | | "pdp-11 programmer - some assembler | | (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+