Softpaq Solution:  SP1564
File Name:  BIDIR50.SYS 
Title:  Fix Driver for NCR 5223 Passbook Printer on Certain Compaq Desktops
Version:  2.00

CATEGORY:  Software Solutions / Desktop

EFFECTIVE DATE:  29 Feb 1996

PRODUCTS AFFECTED:  Deskpro 450, 466, 4100, 575, 590, 5100, 5120, 5133;
ProLinea 450, 466, 4100, 575, 590, 5100, 5120, 5133

OPERATING SYSTEM:  MS-DOS 3.0 or greater

SYSTEM CONFIGURATION:  One of the Compaq models named above, connected to an NCR 5223 Passbook/General Purpose Printer, and using printer driver BI5223.SYS (Version 1.03).

SUPERSEDES:  N/A

PREREQUISITE:  BI5223.SYS (Version 1.03) 5223 Bi-directional Parallel Driver

DESCRIPTION:  While printing to a NCR 5223 Passbook/General Purpose Printer from one of the Compaq models named above in PRODUCTS AFFECTED, the user may experience a system lock-up.

BI5223.SYS (Version 1.03) looks for the INTERRUPT bit <bit 2> in the Printer Data Register [printer base address +1] to be set low when an interrupt is generated.  Bit 2 on the Compaq models affected will always return highs when read.  Bit 1 on the Compaq models affected is the EPP INTERRUPT bit.
  
BIDIR50.SYS (Version 2.00) corrects this problem by changing the BI5223.SYS (Version 1.03) driver in memory to look at bit 1 in the Printer Data Register [printer base address +1] and changing parallel port to EPP ver. 1.9 mode.

HOW TO USE:

1.  Download the SoftPaq to a directory on your hard drive and change to that directory.  The file that is downloaded is SP1564.EXE.

2.  From that drive and directory, execute the SoftPaq file:
SP1564 [ENTER]
The following files should be created:
BIDIR50.SYS 
SP1564.DOC

3.  After the files are created, you may delete the downloaded file SP1564.EXE if you wish.

4. Copy BIDIR50.SYS from step 2 to the directory where BI5223.SYS is installed.

5.  Using an editor, add a line after the BI5223.SYS line in your CONFIG.SYS file to execute at system boot.  BIDIR50.SYS must be installed after BI5223.SYS.  The syntax is:
     DEVICE=[c:][path]BIDIR50.SYS

Copyright 1996, Compaq Computer Corporation.  All rights reserved.

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