HP 9836C Technical Computer: Difference between revisions

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[[File:9836-tandon-jumpers.jpg|none|thumb|Rear of floppy drive from 9836C showing jumpers and termination pack.]]
[[File:9836-tandon-jumpers.jpg|none|thumb|Rear of floppy drive from 9836C showing jumpers and termination pack.]]


Double Density 5.25" disks used in the system are formatted with a LIF filesystem using 33 tracks, 16 sectors per track, and 256 bytes per sector for a total capacity of approximately 270KiB. The LIF filesystem measures usage in blocks, these disks have a total block size of 1056.
For more information on the layout of the data store on the disks themselves, see the [[HP 82901M 5.25in 270K FDD]] page which is compatible with the internal drives in this system.
[[File:525dd 16sector.png|none|thumb|HxC Disk map of floppy disk for 9836 showing 33 tracks with 16 sectors [[:File:52dd lif-formated-kfraw.zip|Disk Image Sample Files]]]]
 
 
To decode flux data from a raw image of an internal 5.25" disk, you can use the following {{Archive web|url=https://github.com/keirf/greaseweazle|name=Greaseweazle}} diskdef to properly decode it
<pre>
disk hp.lif.40dd
    cyls = 33
    heads = 2
    tracks * ibm.mfm
        id = 0
        interleave = 1
        secs = 16
        bps = 256
    end
end
</pre>
 
''Note that sector's are 0 indexed requiring id = 0''
 
== Repairs - Modifications ==
== Repairs - Modifications ==


Revision as of 00:25, 2 July 2023

HP 9836C Technical Computer
General Info
Release Year 1981
Manufacturer HP
Condition Working
Technical Specifications
CPU Motorola 68000 8MHz
Categories
Computers
QR Code
(Click for Asset Tag)


A high end workstation computer from HP in the early 1980s primarily for use with CAD and instrument control using the integrated HP-IB (GP-IB/IEEE-488) interface.

Floppy Disk Drives

The internal floppy drives are standard Shugart interface compatible drives, the example I have used Tandon TM200-2A drives, but some units shipped with drives made by Magnetic Peripherals Inc and Control Data as well.

Both of the drives are jumpered at DS0 and MX on U1E as described in the Tandon Manual[1]. A Termination pack is also installed by default in U2F.

Rear of floppy drive from 9836C showing jumpers and termination pack.

For more information on the layout of the data store on the disks themselves, see the HP 82901M 5.25in 270K FDD page which is compatible with the internal drives in this system.

Repairs - Modifications

2023-06

  • Original video cable failed and was replaced with standard male-male DA-15 cable with straight pinout.
  • Computer was originally acquired with a HP 98629A Resource Management Card which was replaced with a HP 98622 GPIO Card since this system will likely never be used with others for the foreseeable future.
  • Floppy drives were disassembled and dry cleaned to remove dust

Archived Media

Video Appearances

Related Devices

External Projects and Software

External links

  1. ↑ Page 26 of "OEM OPERATING AND SERVICE MANUAL TMIOO-l, TMIOO-2 DISK DRIVES 48 TRACKS PER INCH" in the Tandon Manual (archived)
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