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-
- I have decided that most the print spoolers for the IBM PC
- are just junk. They dont dont have enough flexibility in operation and few
- if any can give you updated status of the buffer. Part of the problem lies
- in the basic hardware flaws of the IBM PC. It is impossible to generate a
- true interrupt driven spooler for the IBM parallel port. This is because the
- ACK signal coming back from the printer is tied direct to the interrupt
- controller. Unfortunately the timing of this signal,as defined for standard
- centronics interface,is too fast to be acknowledge by the controller! It
- is uncanny how one simple flip-flop inserted between the signal line and the
- controller could have elimnated the problem! All the clones out there
- never bothered to include it either,copying IBM line for line!
-
- As a result,all spoolers have to tag themselves to either the
- keyboard interrupt or timer. Some tag to both of them. However some control
- of priority is needed,or conflicts may occur. This priont spooler alows
- that control. THe spooler is divided into 2 parts.
-
- SPOOL.DEV : This is the actual device driver for the spooler.
-
- BUFFERP.COM : This is control program that sends and recieves
- : information from the device driver. Allow priority
- : or port changing,etc!
-
- A detail of the operation is given below,and how to install the
- program. Source is also included for hackers to use. Although I did not
- write this program originally,it was given to me for modification. The company
- I worked for on this project has since gone under, and I feel that since I
- modified it and the company folded, I have full rights to it. I am giving it
- away free in the true spirit of public domain. Sort of a thank you to many of
- the other fine PD authors who given us programs like Qmodem,EBL,Util, etc! My
- thanks go out to these fine authors!
-
-
-
- Using SPOOL.DEV:
-
- The print spooler allows up to 64K of ram to preserved for use as a
- print spooler. All output to printer device will be routed to the buffer and
- printed to the destination during a 'background' operation. THis will allow
- the user to continue using his computer for other functions. The printer
- devices allowed for this spooler can be as follows:
-
- LPT1,LPT2,LPT3 or COM1,COM2.
-
- Also the device for spooling can be changed at anytime the device is
- installed or after! THe user can set how much memory he wishes to reserve by
- adding a 'switch' to the command line during installation. Install the device
- by editing a file on the boot disk "Config.Sys". THis may be edited with any
- editor such as edlin or Wordstar. Options for the driver are allowed and
- installed as folows:
-
- DEVICE=SPOOL.DEV /60 /L1
-
- Placing this line in the Config.sys file is all that is needed. The first
- parameter "/60" indicates how much memory is be reserved for the buffer. It is
- in allocated in 1K increments. ANy number is allowed from "1" to "63". If no
- number is entered,or an incorrect number, 63 will be the default. The second
- parameter indicates the default port for the spooler. Allowable parameters are
- as follows:
-
- /L1 : Route to LPT1
- /L2 : Route to LPT2
- /L3 : Route to LPT3
-
- /C1 : FOr COM1
- /C2 : For COM2
-
- Any other parameters are not allowed. The default port,if none are
- emtered is LPT1. Make sure that the file SPOOL.DEV is also installed on the
- boot disk. Remember to restart the pc before spooler is activated!
-
-
- The second file BUFFERP.COM is a utility program that allows the user
- to change ports for spooling,clear the buffer and see how much is in the
- buffer. It is menu driven and very self explanatory. It will only work if the
- spooler is installed, otherwise will complain! Execute it by simply typing
- "BUFFERP", making sure the file is on the default drive or in the DOS Path
- specification.
-
-
- I have found few problems with the spooler. THe priority feature of the
- spooler also comes in handy for controlling output speed. It can changed on
- the fly withg the BUFFERP command. Also this is the first spooler I have found
- that works well with the DOS PRINT command! SHould work with any programs such
- as Wordstar or PC-WRITE! Enjoy it!
-
-
-
- Craig Derouen
-
- March 5,1985
-
-
-
- Addemium for RBBS sysops or Multi-Link Users
-
- There is a few things the RBBS sysop or Multi-Link user should know about
- spool.dev Under RBBS if operator page is on and a user pages, my Epson printer
- will cease to log the activity of the BBS, but continues to fill the buffer. I
- have only found Re-boot as a solution to date.
-
- If you are using multi-link It will work fine for either paration, howver
- attempting to change the printer priority causes a crash. It will allow buffer
- clearing however.
-
- If any rbbs sysop figures out how to make page not conflict with spool, please
- leave a comment to the sysop or Craig Derouen at Video Advisor ON-LINE at
- 206/244-1685
-
- Thank you Tim Houser sysop VA RBBS
-