DEC 3000 300X/300

From: Jochen Kunz <>
Date: Sat Dec 28 14:53:01 2002

On Fri, Dec 27, 2002 at 08:46:01PM -0600, Bradley Slavik wrote:

> I finally am almost within reach of getting my DEC 3000 300 working. A few
> years ago I foolishly purchased it without memory, thinking it would be a
> simple matter to inexpensively pick up some memory later. How wrong I was.
Why? You need pairs of 8 MB or 32 MB FPM parity 72 pin SIMMs.
Not that uncommon.

> Now I have purchased a DEC 3000 300X with 160MB memory with the intention of
> lending 32MB to the 300.
Leave the momory where it is. Alphas eat memory in large chunks for
breakfast. 32 MB is enough to get to the SRM prompt, but it is not
enough for real use. 64 MB may be acceptable, 128 MB is OK, more is
needed to have fun.

> Now I look at the back of the machine and my main
> question is what cable do I need to hook up my VT220, or my VT420,
Any regular "null-modem" cable should do the job.

> or what
> model monitor with keyboard and mouse is this thing supposed to work with?
You need a LK201 or LK401 keyboard and a VSxxx mouse. The same keyboard
(and mouse) as used on the VT[234]xx terminals and the VAXstations.

> In a typical DEC fashion, in the manual they do not mention model numbers of
> monitor to go with it,
The video timings for the on board Smart Frame Buffer are:
1024 x 786 _at_ 72 Hz for the 300L
1280 x 1024 _at_ 72 Hz for the 300, 300X, 300LX
Any sync on green capable multisync monitor can be used. You just need
a 3W3 video cable.

> Oh yeah, I have a TK50 in MicroVax II currently. I also have TK70 with
> correct controller board that I would like to put in its place. Friend who I
> acquired MicroVax II from claimed that I needed different cable to go from
> TK70 controller card to TK70 drive than cable for TK50.
I have used the same cable for TK50 and TK70 at least in my PDP-11/73 and
it worked. I don't think that there is any difference in the cable.
BTW: You can use the TK50 drive on the TQK70 contoller but not the TK70
drive on the TQK50 contoller.
Received on Sat Dec 28 2002 - 14:53:01 GMT

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