Hjalfi works on an Z80(/8080) assembler for CP/M (there are plans for portability) using his own Ada-influenced language Cowgol (<a href="https://cowlark.com/cowgol/" rel="nofollow">https://cowlark.com/cowgol/</a>).<p>This is a long video (7:09:57) but as always enjoyable. Hjalfi's videos can rarely be considered directly instructional but I find it interesting to watch what seems to me to be a very natural response. In the process he stumbles on to deficiencies and even bugs in his own Cowgol compiler. If you have the time, I recommend it.