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Fran,
Sorry I missed those pictures of the jumpers in the corners of the PCB. And I assumed the red Lines were added Jumpers.
Thanks for clearing that up.

It has been years since I used the...

How about posting closeup photo's of top left Pins and text on PCB, bottom left pins and text on PCB.
And close up photo of the PADS 0, 1, 2, 3 with "S" & "R" text on PCB?

Thanks.

Larry

From your Photo #2 in the last post I see you added some red jumpers trying to get the signals to the
correct place. Rather than doing that what we need is a Schematic and a Technical Manual that...

It looks to me like your Photo on the Right (PCB) is numbered as follows.
The Pin you have as 1 is really 2, as 1 3, 5 are GND. Pin 7 has no Pin in the connector
to match your ribbon cable. I've...

The easiest test would be take your 8" floppy Drive and check Pin 26 of the 50 Pin connector.
It will go to the DS1 Jumper for Drive Select. That way you know 100% you are on the correct
Pin, and...

I found a PNG with the pinout for using Disk Change with 8" Floppy Drive.



PC(34p) 8"(50p) Description

> 2 TG43
8 < 20 Index

A: (For 8" DS{1..4} use...

Fran,
I can't determine if you are using two floppy drives or just the 8" Drive. Plus I've not seen or used the FDADAP Interface Board.
I'm thinking you will have better success if you plug the...

Fran,
Your YE-DATA YD-174D appears to be very similar to the "YD180_~1.PDF" file I downloaded from Bitsavers (PDF).
Page 25 describes the Interfacing and there are hand written notes on that page...

Here is a list of the typical jumpers found on assorted Floppy Drives.



HC - Head loading is continous
HD - Head loading controlled by the Drive Select signal
HM - Head loading controlled by...

I continue to use Dri-Slide, a Motorcycle Cable Lubricant, that does not attract dirt.
Just a few drops will lubricate the Head Guide Rails and it lasts a long time. It's
good for Scanner Rails...

It shouldn't take long to check the Motor's windings with an OHM Meter, as there is a Plug
that disconnects the Motor as shown on the Schematic. Just be sure to also check the
"FLYBACK" Diodes...

I'd suggest checking the Power Supply(s). I've never worked on a 4P, but the Model 3's and 4's that had
the Tandy Power Supply (vs Astec) with a long row of vertical round pins, were bad about...

What happens if you leave the Ribbon cable connected to the floppy's and just unplug the
Power Cables to both floppy's? Is the video correct?

Or what happens if you just unplug the Ribbon cable...

Your ftp://ftp.whtech.com/ requires a login......

Try:
http://www.whtech.com/ti/
http://ftp.whtech.com/


http://www.shlock.co.uk/Utils/OmniFlop/OmniFlop.htm

I always use a few drops of Dri-Slide a Motorcycle cable lubricant that does not attract dirt.
I also use a few drops on scanner rails. The floppy's and scanners will work for about a year
before...

If you have a CP/M Computer that you can connect the Floppy Drive to, you can use DU-89.ZIP
to step the Floppy drive to various tracks and see what TP-8 and Pin 26 (TRK 0) signals are according
to...

JonB,
I've found that Tandon TM-100-x's have the two Caps on the RPM board that leak and the acid
eats up the PCB traces for the RPM Board. I've used some Copper Rivets to insert into the PCB...

Just curious if your Model 1 rev G Motherboard had Version 1.3 ROMS. I updated my Older Model 1
from Ver 1.1 ROMS to Ver 1.3 ROMS to get rid of repeating keystroke and trouble loading from...

Boot your CP/M Version and execute the following commands. Post the settings you find.



STAT DSK:
STAT A: DSK:
STAT B: DSK:

This site:
http://oldcomputers.dyndns.org/public/pub/cdrom/oak.oakland.edu/cpm/zmodem/index.html

has an Overlay for the TRS-80 Model 4 & 4P that has information on the Ports and Bits.
...

The problem you are going to run into is the UART for the Model 4P is


U33 TR1865 UART 8040865

U73 BR1943 Clock Generator


and none of the drivers available are designed for these...

There are several ways you can do this much easier, than with RS-232C Transfers.

I've included my TRS-80 Definitions that are for 22DISK, cpmtools, and libdsk.

1. You can use Chuck(G)'s 22DISK...

Qedit is my preference.

QEDIT21.ZIP


Larry

Here is a link to the ZIP files:
*.IMD
*.RAW
*.TXT
*.HFE

https://drive.google.com/drive/folders/1C98RYU5R10vzEdDRytV4Jt_TSx_cf8Dr?usp=sharing

Now you should be able to test them, making...

I changed my BIN2IMD command to:


$ BIN2IMD RLDH.RAW RLDH.IMD DM=5 N=40 SS=512 SM1=0-9 HM0=0.10 SM0=10-19 HM1=0.10




IMageDisk Utility 1.18 / Mar 07 2012
IMD 1.18: 20/01/2021 6:03:39