TD8E IOT's

On Dec 8, 22:06, Christopher McNabb wrote: 67x1 SDSS Simple DECtape skip on Single Line flag skip if Single Line flag is set 67x2 SDST Simple DECtape Skip on Time Error flag skip if Time Error flag is set 67x3 SDSQ Simple DECtape Skip on Quad Line flag skip if Quad Line flag is set 67x4 SDLC Simple DECtape Load Command Register load Command Register from AC clear Time Error start UTS delay if UNIT, DIRN, or STOP/GO flip-flops are changed 67x5 SDLD Simple DECtape Load Data Register load Data Register from AC -- do not clear AC clear Single Line and Quad Line flags 67x6 SDRC Simple DECtape Read Command Register load contents of Command Register, Mark Track Register, and Status bits into AC clear Single Line and Quad Line flags 67x7 SDRD Simple DECtape Read Data Register load contents of Data Register into AC clear Single Line and Quad Line flags Unit numbers: Unit 0,1 use opcodes 677x Unit 2,3 use opcodes 676x Unit 4,5 use opcodes 675x Unit 6,7 use opcodes 674x This is on page 8-4 of the PDP-8 Maintenance Manual, Vol.3, which you can get from David Gesswein's excellent website. -- Pete Peter Turnbull Network Manager University of York