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On the CoCo 1 & 2 machines, to set the hi-speed mode you would do a POKE&HFFD7,0 - this doubles the access rate to the ROM but not the RAM, thus you keep your display. To speed down from this you would issue a POKE&HFFD6,0 command. There were two other POKEs: POKE&HFFD9,0 would double up the rates for both ROM & RAM killing your display, speed back from this is POKE&HFFD8,0. In the CoCo 3 the later set/reset pokes were fully supported. Some advocated the speed-up POKE use, some were against it... DISK & TAPE I/O would be affected also. Despite a faster flashing cursor on the screen, it was easy to forget & overlook this and attempt to save a file on disk/tape on this mode. Bad results