Crystal frequency for monochrome video signal?
On Thu, 14 Feb 2013 13:15:11 -0500, "Michael A. Terrell"
wrote:
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.
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. ;-)
|