'serial to vga'
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: waybeat.com.aupeterw
|Eric Schlaepfer (autodesk.com) was talking about eric.schlaepfer
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.
From: Peter Williamson <WAYBEAT.COM.AU> peterw
>Anyone know if it's possible to make a rs232 to vga monitor
>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: waybeat.com.aupeterw
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