169 (NORD-1 card) - Revision history

Gandalf: More information and a small correction

2016-08-05T22:05:09Z

More information and a small correction

← Older revision		Revision as of 22:05, 5 August 2016
Line 17:		Line 17:

	==Switches and indicators==		==Switches and indicators==
	There are no switches or indicators on this board, but there is a strap field on the front ~~with an unknown~~ function~~, probably~~ to ~~set~~ the ~~memory size~~.		There are no switches or indicators on this board, but there is a strap field on the front.
			The four top positions are grounded and the four inputs have pullups.

			Counting from the top :
			* MT4 Goes to the edge connector 45 (MCIR<sub>0</sub>) but is also used internally on the card. This signal is also controlled by the MC<sub>0</sub> signal from the edge connector 49.
			* MT3 (Test I/O) : Goes straight to the edge connector 55 (MT3<sub>0</sub>)
			* MT2 : Goes straight to the edge connector 54 (MT2<sub>0</sub>)
			* MT1 (Repeated single) : Goes straight to the edge connector 53 (MT1<sub>0</sub>)

			==Function==
			Preliminary : The function seems to be to translate and ensure the timing of the control signals are correct. To do that it uses four JK-flip-flops (74107) and two one shots (74121) along with logical gates.

			The card has a free running oscillator at about 2.5 MHz consisting of four inverters (3C) and RC circuits.

	==BOM==		==BOM==
	This list contains the logic circuits used, passive components are not listed.		This list contains the logic circuits used, passive components are not listed.
	* 2 x 7400		* 2 x 7400 quad 2-input NAND gate
	* 1 x 7401		* 1 x 7401 quad 2-input NAND gate with open collector outputs
	* 2 x 7402		* 2 x 7402 quad 2-input NOR gate
	* 5 x 7404		* 5 x 7404 hex inverter
	* 3 x 7410		* 3 x 7410 triple 3-input NAND gate
	* 2 x 7420		* 2 x 7420 dual 4-input NAND gate
	* 5 x 7440		* 5 x 7440 dual 4-input NAND buffer
	* 1 x 7450		* 1 x 7450 dual 2-wide 2-input AND-OR-invert gate (one gate expandable)
	* 2 x 74107		* 2 x 74107 dual J-K flip-flop with clear
	* 1 x 74121		* 2 x 74121 monostable multivibrator

	==Reference==		==Reference==

Gandalf: Some fixes and minor details

2016-07-16T14:16:58Z

Some fixes and minor details

← Older revision		Revision as of 14:16, 16 July 2016
Line 1:		Line 1:
	'''169 Cambridge control''', is a card that is used in the [[NORD-1]] CPU.		'''169 Cambridge control''', is a card that is used in the [[NORD-1]] CPU.
	[[Image:NORD-1 card ~~159~~-c.jpg \|300px \| thumb \| Component side.]]		[[Image:NORD-1 card 169-c.jpg \|300px \| thumb \| Component side.]]
	[[Image:NORD-1 card ~~159~~-s.jpg \|300px \| thumb \| Solder side.]]		[[Image:NORD-1 card 169-s.jpg \|300px \| thumb \| Solder side.]]
	It is a controller for interfacing the [[EXPANDARAM-18]] core memory.		It is a controller for interfacing the [[EXPANDARAM-18]] core memory.
	{{Stub}}		{{Stub}}
Line 14:		Line 14:
	\| 35 \|\| C31		\| 35 \|\| C31
	\|}		\|}
	The logic diagram is documented in drawing '''~~2A59~~'''.<ref>HARDWARE MANUAL NORD 1</ref>		The logic diagram is documented in drawing '''2A69'''.<ref>HARDWARE MANUAL NORD 1</ref>

	==Switches and indicators==		==Switches and indicators==

Gandalf: Initial page

2016-07-11T00:11:05Z

Initial page

New page

'''169 Cambridge control''', is a card that is used in the [[NORD-1]] CPU.
[[Image:NORD-1 card 159-c.jpg |300px | thumb | Component side.]]
[[Image:NORD-1 card 159-s.jpg |300px | thumb | Solder side.]]
It is a controller for interfacing the [[EXPANDARAM-18]] core memory.
{{Stub}}
==Introduction==
The card is made in the [[standard NORD-1 card format]].
{| class="wikitable"
|-
! CPU model !! Crate position
|-
| 29 ||
|-
| 35 || C31
|}
The logic diagram is documented in drawing '''2A59'''.<ref>HARDWARE MANUAL NORD 1</ref>

==Switches and indicators==
There are no switches or indicators on this board, but there is a strap field on the front with an unknown function, probably to set the memory size.

==BOM==
This list contains the logic circuits used, passive components are not listed.
* 2 x 7400
* 1 x 7401
* 2 x 7402
* 5 x 7404
* 3 x 7410
* 2 x 7420
* 5 x 7440
* 1 x 7450
* 2 x 74107
* 1 x 74121

==Reference==
<references/>
* Hardware in [[NORD-1 Serial 47]]

[[Category:NORD-1 hardware]]