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PICList Thread
'serial to vga'
1998\12\04@195447 by Peter Williamson

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Anyone know if it's possible to make a rs232 to vga monitor convertor
using a pic 168X. i.e pic recieves serial cmds and them outputs vga
signals to create images on the monitor.

Any web sites dealing with this ??
--
Peter Williamson | Phone: +61 15 898934
Waybeat Pty Ltd  | Email: spam_OUTpeterwTakeThisOuTspamwaybeat.com.au

1998\12\05@194831 by Russell McMahon

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Eric Schlaepfer (.....eric.schlaepferKILLspamspam@spam@autodesk.com) was talking about
something vaguely like this in late September.

Clive Sinclair showed it can be done (Z80 in ZX80 & ZX81).
However, the Z80 had some special features which they made use of
which don't apply to the PIC.
Consider the tight timing constraints.
A line of video is about 64uS total including blanking & sync.
A PIC at 20 MHz gives 5 instructions/uS or 320 instructions per line.
If you use no external hardware you would be hard pressed to output
80 dots per line. Using a parallel load, serial output shift register
to output 8 bits per byte would make this about 80 characters.
However, character translation etc would be very taxing (but not
impossible). A 50 MHz SCENIX would be 10 times as fast  which would
make all the difference here.
There are many dedicated "VDU" type ICs available - you would need a
particularly good reason to attempt to do the whole job within a PIC.


-----Original Message-----
From: Peter Williamson <peterwspamKILLspamWAYBEAT.COM.AU>

>Anyone know if it's possible to make a rs232 to vga monitor
convertor
>using a pic 168X. i.e pic recieves serial cmds and them outputs vga
>signals to create images on the monitor.
>
>Any web sites dealing with this ??
>--
>Peter Williamson | Phone: +61 15 898934
>Waybeat Pty Ltd  | Email: .....peterwKILLspamspam.....waybeat.com.au
>

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