hello gagul,
sorry for my late reply....In the last two days I tried to copy your data on a 5.25 floppy.
This causes serveral problems.
Finally I found out that the 5.25 drive of our dual floppy at pg 750 is damaged . Only the 3.5 floppy is working.
The 5.25 floppy of the second PG 750 works and only of of 4 floppies was not damaged
now my problem is to transfer the data from one PG to the other.
Additionally I am busy with my regular job, so I only can look at these things only aprrox 1 hour a day.
So in the next days I´ll try to mount the working drive at the other PG, but this takes time. Hope that you have some time.
When I was looking at the whole thread I saw that you used the the PG7xx cable at a PG685. This could not work because
the pinout of the com ports on both PG are different.
The cable is for transferring 20 mA signals.
For my understanding, at which computer you have KA470 running under dos ?
Do you have MS-DOS running at PG685?
Does this computer have a working com1 port with 25 or 9 pin plug?
Maybe the easiest way is to buy a 20mA converter for the com1 of your PC.
We used these converters in the past for coupling s5-PLC´s with PC´s .
I´ll continue trying to create a 5.25 floppy running under CP/M with your files, but this will take some
more time than I expect.
regards
Burkhard