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IBM drive 4865

wulp

wulp

Experienced Member
Joined
Oct 6, 2018
Messages
88
Location
Antwerp, Belgium
Hello,
I have an IBM 4865 floppy drive with a PY227B card. I want to test this drive on a Pentium I. To do so, I am using the announcements:
DEVICE=DRIVER.SYS /D:2 /F:2
DEVICE=DRIVER.SYS /d:3 /f:0
DEVICE=DRIVER.SYS /d:2 /t:80 /s:9
but there is no response.
The drive letter is assigned, but the drive does not respond (the light is off).

What am I doing wrong?
 
I see that you also posted on Vogons, at [here], and on a .de site at [here]. In post #7 of the .de site, you added photos.

Your 4965 is the type that expects power to be supplied to it via the cable that connects to the DB37 connector of a floppy controller. According to the thread at [here], "+12V goes to pin 1 and +5V to pin 4 of the DB37, ground on pins 2&3."

Good photos of the PY227B controller are at [here]. The user connects power to the orange connector, and that power gets routed to certain pins on the DB37 connector, per the photos below. A responder to the .de post indicates same; English translation: "The connection CNP of the card should include the power supply for the external drive."

Are you providing suitable power to the orange connector (CNP') ? Make sure that you do that correctly. For example, accidentally putting +12V onto the drive's +5V line might damage the drive.
1779423109909.png
 
As I said on .de: a friend is testing this for me and called for help because he couldn't figure it out. So I am posting the question on the sites where I regularly find an answer.
I will pass on your ideas to him and hope he succeeds.
Many thanks in advance for your detailed contribution!
 
@-0°

I 'm on holiday and i just got a message from the man who's testing my IBM 4865.
Maybe you could help??

Could you just double-check that about the power supply voltages? I checked that, but if I were to connect the power supply as in your email (1 = 12V, 2/3 = GND, 4 = 5V), I am pretty sure I would break something unless I am overlooking something...

If I measure the setup, pin 1 of CNP1 comes out on pin 14 of the 2 ICs on the drive (the left PCB in the photo is the one where the round black cable connects). These are 2 SN7438 ICs, but those ICs are only rated for 5V and not 12V.
image (2).pngimage (1).png
 
wulp said:
If I measure the setup, pin 1 of CNP1 comes out on pin 14 of the 2 ICs on the drive (the left PCB in the photo is the one where the round black cable connects).
Click to expand...
That is what I expect. See the diagram below. Note the crossover of pin numbering that is occurring within the PY227B.
1779926108926.png
 
@ modem7
At last, we were unable to get the IBM4865 working.
The drive itself was recapped; it worked perfectly (tested in an IBM Model 30).
The control system was also recaptured.
Afterwards, the drive was connected to a
Pentium 2 (MB: Edom/WinTech W6BXA) and a Pentium 3 (MB Intel N440BX (Nightshade))
Booted with a DOS startup disk (3.30) with driver.sys in the config.sys

The following instructions were attempted:
Resp.:
DEVICE=DRIVER.SYS /D:2 /F:2
DEVICE=DRIVER.SYS /d:3 /f:0
DEVICE=DRIVER.SYS /d:2 /t:80 /s:9

Since the drive itself works, I can at least use it in another IBM.

Thanks again!
 
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