[HECnet] RSX-11 setback

[Cory Smelosky]

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On 21 May 2014, at 03:26, Johnny Billquist <bqt at softjar.se> wrote:

On 2014-05-21 05:14, Cory Smelosky wrote:
If only I could use the LTC from my busted 11/23+ :(

Hmm. Hang on. The 11/23 you have (also an 11-23+ I think we now have established) have the clock device on the CPU card, unless I remember wrong.
So you all need is a clock signal on the backplane. That is available in a BA23. Comes from the power supply.

The dual height module has the clock too? Huh. I do have a BA23 PSU so I can do this.

I have no card cage...but I have everything else needed to use it


    Johnny


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On 20 May 2014, at 21:43, Cory Smelosky <b4 at gewt.net> wrote:

On Tue, 20 May 2014, John Wilson wrote:

From: Cory Smelosky <b4 at gewt.net>

If the MicroPDP-11/73 front panel included an LTC I would be set to get
RSX-11M+ up with 1M of RAM TONIGHT.   I don't have a dedicated clock
device. :(

Easily hacked up:

    http://www.dbit.com/pub/pic/kw11l.asm

I used this (on a small piece of perfboard dangling from wires wrapped
directly into the backplane and wrapped in paper) to get RSX11M+ running
on a dual-height 11/73 with a 2 MB RAM card and a CQD-220 (with a Fuji
DynaMO), all on a four-slot dual-height backplane (in a BA11-VA) which
had the wires added for Q22.   An 8-pin PIC is fine (with code updated as
needed) but 16F84s were what I had on hand (along with a homemade burner).

I PROBABLY have a PIC around here somewhere...but I don't know where and I know I DEFINTIELY don't have a crystal of that frequency.   I have an arduino that I SUPPOSE could be hacked to work.

Does the bus itself need any special configuration?   I DO have the front panel with an LTC from the NETCOM I can borrow for awhile (No need for it until I patch ZRQCH0.   It looks to connect to the normal bit on the backplane where the front panel does. I can order the parts in the meantime if I do this)

John Wilson
D Bit

--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects


-- 
Johnny Billquist                                   || "I'm on a bus
                                                                ||   on a psychedelic trip
email: bqt at softjar.se                         ||   Reading murder books
pdp is alive!                                         ||   tryin' to stay hip" - B. Idol