DIYbanter - View Single Post - Crystal frequency for monochrome video signal?

Michael A. Terrell

wrote:

On Wed, 13 Feb 2013 21:19:15 -0500, "Michael A. Terrell"
wrote:

wrote:

On Tue, 12 Feb 2013 23:55:12 -0500, "Michael A. Terrell"
wrote:

Mark Zenier wrote:

In article ,
Michael A. Terrell wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.

The Intel MDS blue box system used it, if someone wants a design
example.

Was that their 8085 development system with the 8" disk drive?

Diskette?

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*.

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.