[HocusLocus]

The Z80 will always be my first love, in a TRS-80 Model 1 and soon after, the Vector Graphic Vector 3 which was a sturdy S-100 machine running CP/M. Robert Harp of Vector was an extremely competent designer faced with a challenge, a computer with CPU, CRT and keyboard in one unit. All-in-one machines were a challenge because noise from the video stream and HV flyback transformer pervaded the insides, so he restricted the 6 card S-100 cage width to a few inches and found the worst transients on signal lines and placed extra conditioning on the bus, mods reported back to Zilog to assist with future Z80/S-100 builds. The Vector 3 paper manual had 40 dense pages in the back with commented assembly of its entire BIOS. That was a nice touch and I taught myself assembler from it.