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PC 5150 Diskette Adapter

What is the Diskettte Adapter/A ?

The Diskette Adapter/A was a PS/2 add-in card with one interal 2x17 internal connector and one DC37 external connector whose purpose was to provide support for 5.25" drives (both 360K and 1.2M) without making the user sacrifice either of his 3.5" internal drives. In other words, it was a secondary floppy controller for the PS/2 and most often bundled with the 4869.

The full-blown adapter(FRU 15F7996 and FRU 15F7996 ) were failrly uncommon; many users opted for the less-expensive pass-through (from the existing floppy controller) card (FRU 72X6758 ) and sacrificed the use of one 3.5" drive.
 
well ya true, but some times a good old fashioned, friendly thread bump doesn't hurt either.
I'm curious about how to convert the 4869 to work with the PC and the XT and would like a tutorial if at all possible

What the heck is a "thread bump"?
 
I'm curious about how to convert the 4869 to work with the PC and the XT and would like a tutorial if at all possible
The 4869 is MADE for these machines, if I'm not mistaken. All you need is the appropriate ISA card.
 
The 4869 is MADE for these machines, if I'm not mistaken. All you need is the appropriate ISA card.

The 4869 seems to be made for a PS/2. If you read the thread from the beginning you'll see how I did it,
and how Chuck prefers to do it.

Bill
 
The 4869 seems to be made for a PS/2...

And to be clear, the 4869-001 is with a 360Kb drive, designed to connect to the PS/2 Model 30 and the microchannel systems using the pass-through adapter. The 4869-002 was a 1.2Mb version, and to be paired with the microchannel Diskette Adapter/A. I think the discussion so far has covered connectiong up a 4869-001 to a PC/XT.
 
In forums, if a thread has died for a while and no one has responded to it, or if it has fallen below the first page when you open the forum section, one used to go *Bump*. A simple message with the word Bump in it.

Those are not a good idea here. If the content of a thread is worthy of attention and/or response it will get it. A bump, like all other content-free posts, will only get the ire of the moderating staff...

This has been a public service announcement.
 
For clarification, i'd like to put a Chinon FZ-357, or an epson SMD-340 into the 4869, both are highly configurable, and i've got the card-edge adapter, but am still confused as how to make it work.

My 4869 is the -002 model
Not sure if i wanna mess with it, i'm still not sure of what i'm doing.

And Erik, sorry bout the bumping, but it's good to know your still around :)
 

I have 2ea of early version of IBM 5.25" Diskette Drive Adapter (P/N : 1809113 XM) in 1981.
This supports 5.25" 360KB (fully), 3.5" 70KB (partially, needed driver for full working.)

But this is for IBM PC 5150 only, Not for IBM PC XT 5160 / AT 5170.
Because this doesn't work on IBM PC XT 5160 / AT 5170.

To work on IBM PC XT 5160, IBM 5.25" Diskette Drive Adapter (P/N : 1501484) from 1982-3 should be needed.
 
I have 2ea of early version of IBM 5.25" Diskette Drive Adapter (P/N : 1809113 XM) in 1981.
This supports 5.25" 360KB (fully), 3.5" 70KB (partially, needed driver for full working.)

But this is for IBM PC 5150 only, Not for IBM PC XT 5160 / AT 5170.
Because this doesn't work on IBM PC XT 5160 / AT 5170.

To work on IBM PC XT 5160, IBM 5.25" Diskette Drive Adapter (P/N : 1501484) from 1982-3 should be needed.
That sounds odd, and needs corroboration. When I get back home from holiday, I will try my 1809113 labelled controller (presently in my early IBM 5150) in my IBM 5160.

You don't by chance have a power supply in your IBM 5160 that doesn't output -5V (the early controller needs -5V, whereas the later controller doesn't) ?
 
Even if -5V power is supplied or not, the result is not operated in the same way.
(Even if I use AT power or AT->ATX converter that can supply -5V power to me Same.)

As you know, the -5V power supply is needed not only for the ISA bus, but also for the 4116 RAM chip of the IBM PC 5150 Rev.A (16KB-64KB). For reference, it works well on the IBM PC 5150 Rev.A (16KB-64KB) motherboard that requires -5V power supply.

By the way, for FDC for IBM PC XT 5160, to P/N: 1501484 It is presumed to have improved such problems because the existing FDC (P/N: 1809113) only works on 5150.
 
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I confess that I'm not following. The bus speed between the 5150 and 5160 is the same, no? The CPU is the same.
I do recall that the first 5150 floppy controllers used the Intel 8272 with the 1msec "VCO sync blind spot"; later ones used either the 8272A or the NEC 765AC, where the VCO sync period was only 500µsec. The former could be a problem with 9 sector disks not seeing the first IDAM.

Can you give specifics as to why the original doesn't work? TYIA.
 
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