#: 7768 S15/Hot Topics
    25-Oct-90  22:05:13
Sb: #Graphics
Fm: Frank Hogg of FHL 70310,317
To:  76703,4227 (X)

Kevin,

Interesting thing came up today. Twas about how fast a bunch of TC9's would be
doing graphics as graphic terminals vs serial graphic terminals. The number was
4. Sooo... If you had four graphics terminals running at 38,400 baud on a 68K
system how would that compare to four TC9s running on the bus. This is assuming
that the graphics manipulation was done by the 68K that was also on the bus.

Now, as I see it you would have a 16 Mhz 680x0 doing the stuff. A terminal
would be doing 3,840 8 bit characters per second going to the terminal. A 16
Mhz 680x0 does 32000 or so 8 bit cycles per second. I know that this is not
correct and if it were it would be further divided by the cycle time of the
instructions etc. Also the fact that the terminal is doing 'some' of its
graphics processing on-board would affect things.

We can presume that the TC9s on the bus would be lots faster. But do you have a
better feel for just how much faster??

Fun things to ponder while we're waiting for Bob.

Frank

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