Trade Massbuss for LP card?

From: John Lawson <>
Date: Thu Dec 16 10:59:17 1999

On Thu, 16 Dec 1999, Pat Barron wrote:

> On Wed, 15 Dec 1999, John Lawson wrote:
> >
> > In the 11/44 system which is now occupying my evenings... there


> The RH11 UNIBUS MASSBUS adapter actually consists of several boards:
> M5903 MASSBUS terminal tranceiver
> -> M5904 MASSBUS control tranceiver
> -> M7294 MASSBUS data buffer and control
> M7294-YA Modified M7294 for RH11-C (used on DECSYSTEM-2020)
> -> M7295 MASSBUS bus control (RH11-A only)
> M7295-YA Modified M7295 for RH11-B
> -> M7296 MASSBUS control and status registers
> -> M7297 MASSBUS parity control
> The appropriate boards live in their own section of backplane.

    Ah, so... I have the boards (as marked above) in the unit
currently... just like you have described it.

> The RA90 is an MSCP drive; you need a UDA50 to run it. MASSBUS drives are

   Yup. I gathered this from the Peripherals Handbook that I fell
asleep reading last night. O Well.. I got the RA 90 for $5 from a
guy at the TRW Ham Swapmeet here in SoCal who thought it was a big
power supply, because the power unit for the drive rides piggyback
on it, and has a big rating plate that identifies it as a power supply.

Thanks very much for your help!


Received on Thu Dec 16 1999 - 10:59:17 GMT

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