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Quick Look at PDP-8 and PDP-11 Systems on Chip

bladamson

Veteran Member
Joined
Nov 11, 2018
Messages
872
Location
Appalachia
A quick video while I get to a point where I can make another one on my H11. Any of you guys ever build a SBC6120?

 

reinhardtjh

Experienced Member
Joined
Jan 15, 2014
Messages
99
Location
Fort Worth, TX
Gosh, I need to finish putting my SBC6120 together...

I need to start mine. I got the kit almost exactly 16 years ago! Time sure flies.
From: "John H. Reinhardt" <xxxxxxxxxxxxx>
Date: 7/8/2006, 11:59 PM
To: sparetimegizmos@yahoogroups.com

At 04:33 PM 7/6/2006, Bob wrote:

FYI for everybody, as of today (Thursday), all the PK1 and PK2 orders that
were placed on or before July 4th have been shipped. You should have all
received email confirmations from the Post Office - if you didn't, let me
know.

Got mine today. Shipped out July 6th, received in Cincinnati on July
8th. Thanks!

It's a beautiful little circuit board. I'm looking forward to this. I
haven't built much like this since I put together my Digital Group Z80
system in 1977. This looks to be a lot less tedious then the 208 16-pin
memory chips for the whopping 26KB I had in that thing.

John H. Reinhardt
 

saipan59

Experienced Member
Joined
Dec 27, 2010
Messages
222
Location
Colorado Springs
Somewhere around here I have a DEC 21-17311-02 T11 processor chip.

Has anyone built something with that? Besides Atari?
Yes. See this thread:

Also, a few years ago I built this clock (picture below). The board is wire-wrapped. The time base is a vintage 3.579545 MHz TV colorburst crystal (in a cool glass envelope!), driving an MM5369 chip. The code is a version of my Forth system, with a few lines of Forth code running in a loop to do the clock functionality.

Pete

T-11_clock.jpg
 

saipan59

Experienced Member
Joined
Dec 27, 2010
Messages
222
Location
Colorado Springs
Somewhere around here I have a DEC 21-17311-02 T11 processor chip.

Has anyone built something with that? Besides Atari?
Also built this. It's a large wire-wrap board, used as a 'sandbox' for experimenting with different T-11 related stuff.
Features currently include:
- T-11 with 8KB RAM and 8KB EEPROM (in a ZIF socket).
- AY3-1015D UART (like used on some old DEC serial boards).
- Intel 8255A parallel I/O.
- A simple "event counter" in the upper-right, driven by 2 lines from the 8255. It has a 3-digit LED display.
- A simple 555 oscillator that interrupts the T-11, causing the T-11 to increment the event counter.
- A separate "ASCII terminal", implemented with an MC68701 with it's own RAM and such. At the bottom of the pic is a 2-line 40-column LCD display for the terminal. The keyboard plugs into the phone jack at bottom-left.

Pete

T11.jpg
 
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