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46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
Disk: Brother FB-100
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====================
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The Brother FB-100 is a serial-attached smart floppy drive used by a several
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different machines for mass storage, including the Tandy Model 100 and
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clones, the Husky Hunter 2, and (bizarrely) several knitting machines. It was
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usually rebadged, sometimes with a cheap paper label stuck over the Brother
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logo, but the most common variant appears to be the Tandy Portable Disk Drive
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or TPDD:
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<div style="text-align: center">
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<a href="http://www.old-computers.com/museum/computer.asp?c=233&st=1"> <img src="tpdd.jpg" alt="A Tandy Portable Disk Drive"/></a>
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</div>
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It's a bit of an oddball: the disk encoding is FM with a very custom record
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scheme: 40-track single-sided 3.5" disks storing 100kB or so each. Each track
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had only _two_ sectors, each 1280 bytes, but with an additional 12 bytes of
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ID data used for filesystem management.
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There was also apparently a TPDD-2 which could store twice as much data, but
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I don't have access to one of those disks.
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Reading discs
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-------------
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Just do:
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```
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.obj/fe-readfb100
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```
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You should end up with an `fb100.img` of the appropriate size. It's a simple
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array of 80 1292-byte sectors (12 bytes for the ID record plus 1280 bytes for
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the data).
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References
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----------
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- [Tandy Portable Disk Drive operations manual](http://www.classiccmp.org/cini/pdf/Tandy/Portable%20Disk%20Drive%20Operation%20Manual.pdf)
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- [Tandy Portable Disk Drive service manual](https://archive.org/details/TandyPortableDiskDriveSoftwareManual26-3808s)
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- [TPDD design notes (including a dump of the ROM)](http://bitchin100.com/wiki/index.php?title=TPDD_Design_Notes)
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- [Knitting machine FB-100 resources](http://www.k2g2.org/wiki:brother_fb-100)
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