3 ms·
Similarly, I have come to appreciate rehsd's[0] efforts in building a 80286 computer. 0. https://www.youtube.com/@rehsd/videos https://www.youtube.com/@rehsd/v
by snvzz 4y ago
Similarly, I have come to appreciate rehsd's[0] efforts in building a 80286 computer.
0. https://www.youtube.com/@rehsd/videos https://www.youtube.com/@rehsd/videos
- rep_lodsb 4y agoWow, that series looks fascinating! Only watched the first video yet, after initializing itself the CPU actually runs this code (because D8-D15 is wired to zero): addr opcode FFFFF0 90 NOP FFFFF1 00 90 00 90 ADD [BX+SI+9000],DL FFFFF5 00 90 00 90 ADD [BX+SI+9000],DL FFFFF9 00 90 00 90 ADD [BX+SI+9000],DL FFFFFD 00 90 00 -- !! general protection fault You can see it read and write the same address three times, then fetch the interrupt 0Dh vector and push flags+CS+IP to the stack :)