On Mon, Dec 03, 2018 at 07:02:18AM -0500, Paul Birkel via cctech wrote:
HCF is listed there but the original instruction on the 6800
was thought to be included by the designers for hardware testing.
See:
http://www.liquisearch.com/halt_and_catch_fire/in_modern_cpus/motorola_6800
- Diane
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