Crystal frequency for monochrome video signal?

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Sloppy disk. The drive in mine was bad,

That would be a diskette. We had a pile of the MDS systems(mostly
x86) around work, networked together over one of their servers. All
of them went in the trash heap a quarter century ago. They worked but
they were *SLOW*.

 

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Well, the old guy that read the bits to & from the 1 MHz processer
WAS old. ;-)

I am still amazed that Vital Industries was able to do real time NTSC
color video effects with a 2 MHz Z80B and meet FCC requirements for
broadcast.

It wasn't so much that the processor was slow but Intel couldn't code
their way out of a paper bag. M$ took lessons from them. ;-)