43 lines
1.9 KiB
Plaintext
43 lines
1.9 KiB
Plaintext
=============================================================================
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AST RESEARCH, INC. TECHNICAL BULLETIN #0790 12-01-92
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=============================================================================
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BRAVO 4/33 LC AND IRWIN TAPE BACKUP UNIT
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PROBLEM: Bravo 4/33 LC fails to recognize an Irwin A250EP Parallel Port
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Tape Backup Unit. The EZ-Tape software that is provided with
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the unit is unable to detect the tape drive connected to the
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parallel port. This generates the error message "No tape
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drive found."
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CAUSE: The EZ-Tape software has several delay loops that are executed
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too quickly on the Bravo 4/33 LC.
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AFFECTED
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SYSTEMS: All Bravo 4/33 LC systems.
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SOLUTION: By patching the software and increasing the delay loops, the
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EZ-Tape software can run properly on the Bravo 4/33 systems.
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These delays can be added by manipulating an environment
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string as follows:
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SET PPCFDC=O:12,I:18
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This string represents the environment for the Parallel Port
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Controller Floppy Disk Controller (PPCFDC) to have an Output
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delay factor of 12 (O:12) and an Input delay factor of 18
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(I:18). These values were found to provide the best results
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for the software to function properly. This environment
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string can be typed at a DOS prompt before executing the EZ-
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Tape software or by adding this line to the AUTOEXEC.BAT file.
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This string will not decrease the functionality of the
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software or system. The delay factors are only providing the
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normal delay that would be done on systems that the software
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was originally designed for.
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