I found the manual for CMD 220 on bitsavers... along with a txt file for the 220A/TM (which is what I have). Couple of things: 1. Does anyone have the full manual digitized (or a hard copy you don't want anymore) that covers the 220A (to be exact, CQD-BV220A/TM) ? 2. In the txt file, it has (formatting neatend... (for fixed point font anyway)): W1 OUT Reserved (F) W2 IN SCSI terminator power enabled (F) W3 OUT Reserved (F) W4 1-2 IN Eprom Size 512-Kbit or 1-Mbit (F) W5 OUT 0 Wait State for Eprom Cycles (F) W6-1 OUT Adaptive DMA enabled (F) W6-2 OUT Adaptive DMA Dwell Time enabled (F) W6-4 W6-5 IN IN 0.8-ms DMA dwell time OUT IN 1.6-ms DMA dwell time IN OUT 3.2-ms DMA dwell time OUT OUT 6.4-ms DMA dwell time W6-5 OUT Block mode DMA enabled (F) W6-6 W6-7 Auto-Boot for LSI-11 systems without Boot Roms OUT IN Auto-Bootstrap address = 773000 IN IN Auto-Bootstrap address = 771000 OUT OUT Auto-Bootstrap disabled (F) IN OUT Auto-Bootstrap address = 775000 W6-8 IN Reserved (F) The W6-4, W6-5 pair I believe should be labelled W6-3, W6-4, as W6-5 is documented twice ... and W6-3 is not documented. Anyone know if my belief/assumption is correct ? Anyone know what DMA dwell time should be used in a PDP11/83 ? Should this board be closest to the CPU, or furthest in a an 11/83 ? Thanks in advance, -- Curt