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- DDD Version 1.1 With this program and Dysan Corporation's
- "Digital Diagnostic Diskette"tm
- ($30 for SS and $40 for DS as of 1983...)
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- You can comprehensively test, verify, and
- align the heads of your flexible diskette drive, under your own oper-
- ating conditions, without need for expensive oscilloscopes and drive
- exercisers, to practically the same precision achievable by the usual
- analog methods. Any time you suspect a bug in one of your drives, you
- can determine which drive is at fault and what the problem is.
- No more expensive shot-in-the-dark trips to the service center; no
- more intermittent bugs which won't appear for the serviceman. Takes
- the mystery out of flexible diskette systems!!
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- System Requirements:
- The DDDtm is available for all flexible diskette formats, and works
- independently of any operating system. This program is built around
- CP/M and the 1793 floppy disk controller chip, and can be easily
- configured and assembled (with ASM - no macros... ) for most CP/M
- systems. The screen displays require an addressable cursor and clear
- screen facility from your terminal, but you could display the
- test results without the trick graphics if you don't have these
- capabilities.
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- Operator Requirements:
- You will have to know how to edit and assemble 8080 assembly
- language. Step-by-step instructions for customizing the program
- will be published in Dr. Dobb's Journal, probably in December
- 1983. The code is well-commented and could probably be customized
- without the magazine if you must. You will, however, need to know
- some hardware-specific information about your terminal and disk
- controller; count on needing the manufacturers' manuals and/or
- cribbing the information from your BIOS source. (The disk reads
- must bypass CP/M function calls entirely - you have to send raw
- commands to the controller, and retrieve the data byte-by-byte.)
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- Tests Performed:
- Radial Alignment - on six different tracks, to within 1/2 milliinch
- Positioner Hysteresis - " , using any offset up to full width
- Head Azimuth - from -42 to +42 minutes
- Index Timing - inner and outer tracks
- Diskette Centering - three levels of difficulty (tests bearings, clamping)
- Spindle Speed - (not a function of the DDD... )
- (Many other problems, such as dirty heads, will show themselves during
- these tests... You will want to get familiar with the results of the
- different tests while your drives are working, so that you can recognize
- the changes caused by new bugs.)
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- Verification:
- DDD11.ASM is a 47K file
- CRC (Version 5.0 and previous...) 6E 94
- CRC (Version 5.1 and derivatives...) 7B79
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- Author: LOREN AMELANG
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- CIS Email [70110,551] (I access Snail Mail more often than Email...
- but if you want to send machine code...)
- Box 24, Philo, CA 95466 0024 (Best way to contact me...)
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- Take the mystery out of YOUR flexible disk system !!!
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