Awesome!!! I've not seen this before and it answers quite a few questions I've had.

In the firmware, around address F0F0 there is, for lack of a better term, a switch/case block of code.
The cases are: F, G, R, W, X, A, B, C, S, D, and M
I've not seen references to these before in any documentation, but on page 17 of the PDF (33 of the manual), there they are!

This will help out immensely with documenting the decompiled source of the PDD1 firmware.

Now I just need to put the manual in order and do an OCR on it so it's searchable.

Thank you very much!

On 8/8/2017 2:18 PM, Kurt McCullum wrote:

On Tuesday, August 8, 2017 11:13 AM, "" <> wrote:

Could you e-mail me your 26-3808 manual?
I have a 26-3808 Operation Manual for the PDD1, and the contents are very similar to the PDD2 Operation Manual 26-3814. So this would be new and useful.
Thanks in advance!

On 8/8/2017 1:14 PM, Kurt McCullum wrote:
The manual I have is 26-3808 which details the File mode and FDC mode of the TPDD1. I don't know the number for the TPDD2. 26-3814 is the standard user manual for the TPDD2 and I've got that. I'm not sure if Tandy ever published something for the TPDD2 like the 26-3808 manual. If they did, I'd love to get a hold of it.


On Tuesday, August 8, 2017 9:53 AM, "" <> <> <> wrote:

I have the following:

Tandy Portable Disk Dirve Operation Manual Cat. No. 26-3808
Tandy Portable Disk Dirve 2 Operation Manual Cat. No. 26-3814

If you want one of these I can e-mail them to you.
Do you have a service manual for the PDD? If so, could you e-mail it to me, I'd be very interested in it as I'm working on reverse engineering the firmware on the PDD1 (

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