Need information on TRSDOS 1.3 internals

From: Tim Mann <>
Date: Fri Dec 6 03:37:08 2002

Eric Smith wrote:
> I think you want _TRS-80 Disk and Other Mysteries_. That was one of
> the Mysteries books I didn't have, but ISTR that Al turned up a copy
> recently.

No, that only covers Model I TRSDOS 2.x and NEWDOS 2.1. Sellam asked
about TRSDOS 1.3, which I have to assume means Model III TRSDOS.

> Each track had 10 sectors. They were allocated to files in groups of
> five, which were called granules or grans. There's a Granule
> Allocation Table (GAT) which I think was basically an allocation
> bitmap.

Model I TRSDOS (and single density disks on all TRSDOS-like DOSes that
support single density) uses this format.

Tim Mann
Received on Fri Dec 06 2002 - 03:37:08 GMT

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