MicroVax II question

From: Zane H. Healy <healyzh_at_aracnet.com>
Date: Tue Jan 6 01:41:16 2004

Still, an RZ28 would be a better choice for a 4GB drive. I've never even heard of a RZ74, but I assume it's a full height 5 1/4" model, which translates to more power, and noise than a RZ28. Moving my PDP-11/73 in a BA123 from full height 5 1/4" drives to 3.5"x1" drives made a large difference in the amount of noise it makes, in addition to cutting down on the amount of power that it pulls.


>Fred may be talking about the RA74 (contrasts with the RZ74) here. -jea
>RA's go to KDA50's doing SDI
>RD's go to RQDX's doing MFM/RLL
>RF's go to KFQSA's doing DSSI
>RZ's go to KZQSA's doing SCSI
>I believe some list members have attached the four disk types all to
>a system at once and have succeeded, using a wide QBus cabinet.
>>> I wanted to revive my MicroVax II (BA23 cabinet I think) and add
>>> RZ74 (4GB drive) to it. I am writing number from memory, perhaps
>>> I have made mistakes. Will this card on Ebay do the trick?
>>> I believe this might be the easiest way to get SCSI support
>>> on my machine, but perhaps this card is incompatible, or
>>> drive is too big?
>> Uhm... be *very* careful with connecting these drives, and the
>> KDA50 controllers, to the BA23 power supply. Most of these
>> will *not* be able to handle them together, since the KDA50
>> controller (SDI to QBus) is a power-hungry monster.
>> Other than that, the drive would work just fine on the VAX.

| Zane H. Healy                    | UNIX Systems Administrator |
| healyzh_at_aracnet.com (primary)    | OpenVMS Enthusiast         |
|                                  | Classic Computer Collector |
|     Empire of the Petal Throne and Traveller Role Playing,    |
|          PDP-10 Emulation and Zane's Computer Museum.         |
|                http://www.aracnet.com/~healyzh/               |
Received on Tue Jan 06 2004 - 01:41:16 GMT

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