Love your work!
I do have a TPPD2 here, but not the time to look at it. All my hobbies
have fallen by the wayside at the moment. :-/
On Tue, 8 Aug 2017 22:48:04 -0400, biggran...@tds.net wrote:
For those who are interested...
Getting a copy of the PDD1 Software Manual really helped out with t
For those who are interested...
Getting a copy of the PDD1 Software Manual really helped out with the
reverse engineering effort!
I've figured out a few command tables and added a bunch of documentation
to the assembly source.
I've updated the reverse engineering project here:
https://githu
Hey Gary,
Traveling in China but I will try to find some time to check out differing load
and exe addresses in the linker script.
Ken
Sent from my iPhone
> On Aug 9, 2017, at 7:08 AM, Gary Weber wrote:
>
> I was able to create a LKR file (based off of Ken's Sample.LKR), and I
> did get it to
That's kind of what I thought, there may not even be any code in the
firmware to look at the switches either then.
There's a PDD2 on eBay, I might try and get so I can do some reverse
engineering.
On 8/8/2017 7:31 PM, John R. Hogerhuis wrote:
Not that you can see from the outside, anyway.
Not that you can see from the outside, anyway.
There's a little plastic cover where the DIP switches would be on a TPDD-1.
If you take it off, you just see RF shielding.
Haven't had the whole unit apart though, who knows... might be DIP switches
in there, or maybe an unpopulated area of the board
Quick question, does the PDD2 have dip switches under it like the PDD1?
The PDD2 Operation Manual (26-3814) does not mention dip switches, but
in the schematic in appendix B it shows an outlined dip switch.
I'm just wondering because it may be possible to put the drive into INIT
mode and use
I was able to create a LKR file (based off of Ken's Sample.LKR), and I
did get it to compile and my .CO file gets loaded into RAM just fine,
however the LOAD & EXE addresses are way off so I know there has to be
a problem somewhere.
If anyone out there can offer a bit of guidance for using the Vir
Peppino,
Yes for quite a few years the project was put on hold; I had run into
a roadblock due to a missing high-ram hook in the NEC memory map, a
hook that the Model 100 has but the NEC does not. The project got
stalled and I also got busy. But recently I wanted to pick it back up
and see if I
Well, that confirms what I deduced. Stupid enough, I just assumed i'd be SS/DS.
And I never read the specs... Greetings from the TyRannoSaurus
Jan-80
From: "biggran...@tds.net"
To: m...@bitchin100.com
Sent: Tuesday, 8 August 2017, 16:29
Subject: Re: [M100] 3.5" Media
The specifica
You should indeed be using DD disks if available, but unlike 5.25" DD vs. HD
disks the difference in coercivity of 3.5" DD vs. HD disks is relatively small
and in practice HD disks will usually work in a DD drive without any problems.
m
- Original Message -
From: Geoffrey Oltmans
On Mon, Aug 7, 2017 at 4:33 PM, Kurt McCullum wrote:
> For those who have used a TPDD2 in the past, I have a question about media
> type. Do these drives prefer double density (720k) or high density (1.44mb)
> media? I've tested with both from by using recycled media from years gone
> by and both
On Tue, Aug 8, 2017 at 1:38 PM, wrote:
> Here is a copy I found on the internet looking for a PDD2 Software Manual.
> The listing says PDD2 Software Manual, but it is the 26-3808 PDD1 Software
> Manual (same as the one Kurt sent me).
>
> http://www.classiccmp.org/cini/pdf/Tandy/PDD2%20Software%20
> On Aug 8, 2017, at 1:38 PM, biggran...@tds.net wrote:
>
> Here is a copy I found on the internet looking for a PDD2 Software Manual.
> The listing says PDD2 Software Manual, but it is the 26-3808 PDD1 Software
> Manual (same as the one Kurt sent me).
>
> http://www.classiccmp.org/cini/pdf/Tan
Here is a copy I found on the internet looking for a PDD2 Software Manual.
The listing says PDD2 Software Manual, but it is the 26-3808 PDD1
Software Manual (same as the one Kurt sent me).
http://www.classiccmp.org/cini/pdf/Tandy/PDD2%20Software%20Manual.pdf
http://www.classiccmp.org/cini/syst
> On Aug 8, 2017, at 10:14 AM, 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
> so
I ended up printing mine out and re-arranging the pages. The FDC mode
information was very helpful for the Sardine emulation that I wrote into mComm.
Traveling Software created their dictionary disk using 256 byte blocks (80
sectors, 5 tracks). Steve A. had the disk and pulled the data off for m
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 document
Send
On Tuesday, August 8, 2017 11:13 AM, "biggran...@tds.net"
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!
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 det
I've never seen one.
-- John.
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 l
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 i
Looking at Wikipedia, the 3.5" DD format supports both 40 tracks and 80
tracks.
https://en.wikipedia.org/wiki/List_of_floppy_disk_formats#Physical_composition
And yes there is a difference in the magnetic media for DD and HD too,
using a DD head and the write currents for a DD head would not wo
Does a PDF exists of "Tandy Disk Drive ll Service Manual"?
I have the one for the TPDD1 but not the 2.
On Tuesday, August 8, 2017 7:53 AM, John Gardner wrote:
So flipping a 3.5" floppy work, if the housing for the disk
would let you do that. Hmm...
And the reason HD disks are
So flipping a 3.5" floppy work, if the housing for the disk
would let you do that. Hmm...
And the reason HD disks are unreliable is that the signal returned
by the media when reading the disk is (presumably) too high?
Interesting...
...
On 8/8/17, biggran...@tds.net wrote:
> The speci
The specifications in the PDF for the PDD1 and PDD2 says the following:
PDD1 (26-3808):
Disk
Number of surfaces1
Number of Memory Blocks
Total number of tracks 40
Total number of hard sectors80
PDD2 (26-3814):
Disk
Number of s
On my Amiga, which uses double sided double density media, formatted 880k, I
never was able to use HD floppies. They'd always have formatting issues or
would get disk errors more easily.
Luckily I have a bunch of old hard drive backups from the 90s that are
useless... which means I have a bunch
Interesting. The bank feature is one of the areas I am looking into right now.
Somehow, TS-DOS is able to determine if the drive is a TPPD2 and then the Bank
feature is turned on. According to the manual, 200k is always available
regardless of what bank you are in. It's not split 100k/100k. Each
Gary, so did I !
Could it be that a TPDD just formats 40 tracks and a TPDD2 80 ?
Assuming single-density recording, that would come out right, I think.
I remember that a TRS-80 standard SD disk recorded about 85 KB on 35 tracks.
That would be on 40 tracks: 85 KB * 40 / 35 = 97 KB. That fits.
By
Hi Gary, really a very good news after nearly 10 years of silence.
Is Daniel Born still involved in the thing?
Many thanks!
Peppino
> After rereading this I wanted to make one critical point. Remember, if
> yours is truly the TPDD2, it already is double sided. It formats the drive
> as 100K per side (200K total). You use the "Bank" feature in TS-DOS to
> switch between which side you're accessing. So, no need to be fantas
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