On 23 Aug 96 at 0:51, Edward Plese wrote: > Does the regular TI-OS ever use interrupt mode 1 or any of the > secondary registers (A' B', etc)??? > TI-os is always in interrrupt mode 1. And the shadow registers are used in the interrupts, which means they are destroyed 50 times/second. Regards, Mattias Lindqvist <eng96gml@lustudat.student.lu.se>