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HP Forum Archive 11

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HP-IL 9114 Disk drive - accessing > 128K w/HP-41?
Message #1 Posted by Gene on 16 Mar 2003, 8:12 a.m.

Gene: the quote below is from an Ebay auction for this drive. I'm curious about the utility program he mentions below. Anyone have an idea about an HP-41 program that can do this without using the functions built into the Ext IL module?


This is an auction for a HP 9114A+ Disc Drive, Radio Shack 6volt 1.8amp AC to DC adapter, 1(one) 0.5 meter HP-IL cable, original Operator’s Manual, and the supplement USING YOUR DISC DRIVE. The plus (+) to the title 9114A+ indicates that I have modified this unit to avoid the sealed lead acid battery as the power source. ...I’m also including a utility program that “circumvents” the 128K media limit of the HP-IL Module. This may require additional hardware for the HP-41

Re: HP-IL 9114 Disk drive - accessing > 128K w/HP-41?
Message #2 Posted by Vieira, Luiz C. (Brazil) on 16 Mar 2003, 8:43 a.m.,
in response to message #1 by Gene

Hi, Gene.

The HPIL standard NEWM for the 9114B media allows creation and access of about 128KBytes. Anyway, double-sided, single-density disks allow 630KBytes (extra 80KBytes used as spare space) when used with HP71B or HP75.

There is a program listed in the 9114B (pages 12-19, 370 steps; big guy, more than 120 registers) that may be used in the HP41 WITH extended I/O (HP82183A ROM module) that allows the HP41 to access all 630Kbytes in a disk.

As mentioned by Dan (he wrote an article about file formats and HPIL file streams) one must take care about disk names when disk data will be read in a PC. HP71 and HP75 allow name volume, but disks "formated" with an HP41 as a controler will have no label. Standard programs that read disks generated this way will not recognize HP41 generated disks.

Hope this helps.

Luiz C. Vieira - Brazil

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