TECO ^B on OS/8 and RT-11

At 06:21 PM 7/14/2012, Richard wrote: I'm not sure why you don't think it does. The fact is that TECO-8 does 13-bit math. It's a PDP-8, after all - combining the AC with the link bit gives you 13 bits. TECO-8 retains the full AC and Link for Q-register numeric values and numeric operations. That's why you can get a return value you going to add 4096 to a 12-bit value and make a difference? Or, I can quote from the DEC documentation [1]: H.16 Arithmetic Precision TECO-8 performs 13-bit arithmetic except that multiplication and division by negative numbers gives unpredictable results. All numbers stored in Q-registers are 13 bits long. Numbers stored in flags (such as ET, EU, etc.) are only 12-bits long. When storing a number into a flag, the high order (sign bit) is lost. When using the value of a flag in an arithmetic expression, the 12-bit value is sign extended first. [1] <http://h71000.www7.hp.com/doc/73final/documentation/pdf/teco.pdf>http://h71000.www7.hp.com/doc/73final/documentation/pdf/teco.pdf (It's good to see credit for the TECO-32 creator in this document.) -Rick