Screen update speed of 8088 PC
cclist at sydex.com
Wed Mar 15 21:02:17 CST 2006
On 3/15/2006 at 8:43 PM Jim Leonard wrote:
>Poll? How did you do this, and why was it necessary? I've written
>screen capture programs before and I just dump straight to a file...
If you're working off a keypressed interrupt, you could never be sure that
DOS was in a reentrant state. So you save the capture information, check
the "INDOS" flag. If it's clear, go ahead and write. Otherwise, hook the
timer interrupt and try again in 55 msec.
>> They were panicy about the CGA snow! They were worried about whether it
>> was damaging the monitor, etc.
>> So, I told them that it was just the "flash" from taking the picture,
>> that it was a "FEATURE", to show whether the image had been successfully
>Oh my :-)
One problem I had with my screen capture programs was seeing if they were
actually doing anything. The snow would have been helpful, but you don't
get that on MDA :). So I just disabled the video during the capture,
resulting in a nice visible "blink". That would have also taken care of
the CGA snow issue.
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