2015 UPDATE... I still get requests for Rastread! Wow. I used to supply it by email just to keep track, but at this point, you can download the whole thing - Please, send me a note if you do, just for fun.
If you need the long story, just read the whole thing.
If you want to cut to the chase go here.
 
What's this all about?
 
Do you still use a DOS version of Orcad such as rel 3.10 and would like to print a schematic file to a BMP image?
The easiest way to do this is to use Orcad's built in driver for Raster images. You can choose that as if it were a printer. The only trouble is that it is kind of hard to get any graphic program to recognize such format. I have worked on it and I got just the utility you need to change a Raster file to a BMP. Of course, as far as I know, this is only valid for Orcad's Raster.drv - See an example of BMP generated by RASTREAD.
 
This is what you need to do.
 
First of all, you will need a working copy of Orcad and its original files
PRINTALL.EXE (original)
RASTER.DRV (original under DRIVERS)
 
My system is configured so that:
ORCAD is installed in
D:\ORCAD
 
Files are located in
D:\ORCAD\SHEET
 
Drivers are located in
D:\ORCAD\DRIVERS
 
You can download Rastread HERE free of charge and use it without restrictions. On the other hand, you can write your own program using this documentation.
RASTREAD is a QuickBasic 4.5 program compiled for DOS.
RASTREAD will convert a .RAS file genertated by printall to a B/W BMP.
In order to generate the proper .RAS file, you will need to execute PRINTALL /C and set the printer driver to RASTER. If you no longer use a DOS printer connected to the LPT1, you can leave PRINTALL set to this format for good, otherwise, change it back to your printer driver each time. (That can be done by a batch file).
 
RASTREAD accepts the filename (TEST.RAS) to convert as a command line argument, so you can easily type something such as RASTREAD TEST (no extension), and it will generate a file TEST.BMP. You cannot use a different extension.
RASTREAD can also be executed without providing a filename. In this case, you can type it as requested (still, no extension).
 
Basically, assuming you have a certain file called RS232.sch and you want its output to BMP, you need to type:
(first time only) d:\orcad> PRINTALL /C and then PD (Printer Driver) S (Special) RASTER.DRV U (Update) Q (Quit) - How to do this automatically
 
d:\orcad> PRINTALL RS232.sch RS232.ras
d:\orcad> RASTREAD RS232
 
Now you can delete the raster file if you don't need it anymore
d:\orcad> DEL RS232.ras
 
If you plan to use this quite often, you can create a batch file to make it all automatic.
I have created two text files called SETRAS.TXT and SETPRN.TXT which contain the keystrokes necessary to go through PRINTALL /C and set raster or my HP printer. You don't necessarily need to do that. If you wish, just remember you can use COPY CON SETRAS.TXT to record everything you type to that file, and end it with CTRL+Z.
I have called this batch file SCH2BMP.BAT
@ECHO OFF
CLS
IF NOT EXIST \ORCAD\SHEET\%1.SCH GOTO NFERR
PRINTALL %1.SCH %1.RAS /C <SETRAS.TXT
PRINTALL /C <SETPRN.TXT
CLS
RASTREAD %1
DEL %1.RAS
GOTO END
:NFERR
ECHO FILE \ORCAD\SHEET\%1.SCH DOES NOT EXIST!
:END
 
CUT TO THE CHASE
Assuming your schematic is FILE.SCH
 
What you need minimum files Where on HDD  Where do I get them???
ORCAD
FOR DOS
[tested on 3.10]		 PRINTALL.EXE
ORCADSSDT.OVL

RASTER.DRV
PRINTER.DRV

(all the necessary libraries with the components used in your schematic)		 Depending on your PRINTALL /C settings, you need to place Drivers, Libraries and Schematics under each subdirectory ORCAD 3.10


RASTREAD.ZIP
 RASTREAD RASTREAD.EXE  
You should find FILE.BMP in the same folder as RASTREAD

2015 UPDATE... I still get requests for Rastread! Wow. I used to supply it by email just to keep track, but at this point, you can download the whole thing - Please, send me a note if you do, just for fun.