Gandalf: More info and a correction

2016-08-06T11:58:25Z

More info and a correction

← Older revision		Revision as of 11:58, 6 August 2016
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	[[Image:NORD-1 card 151-c.jpg \|300px \| thumb \| Component side.]]		[[Image:NORD-1 card 151-c.jpg \|300px \| thumb \| Component side.]]
	[[Image:NORD-1 card 151-s.jpg \|300px \| thumb \| Solder side.]]		[[Image:NORD-1 card 151-s.jpg \|300px \| thumb \| Solder side.]]
			It contains a free running oscillator and a state machine. It is reset by the Master Clear signal.

	{{Stub}}		{{Stub}}
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	==Switches and indicators==		==Switches and indicators==
	There are no switches or indicators on this board, but there is a 5 ~~kohm~~ trimmer at the front		There are no switches or indicators on this board, but there is a 5 kOhm trimmer at the front that controls the frequency of the oscillator.

			==Function==
			The oscillator runs freely but can be stopped by external signals (SP1 and MT7). WP9 from the operators panel (possibly HALT) can also block the oscillator.

			The oscillator drives five JK flip-flops that counts up the state machine (16 states). According to the external signals NX and BK the state machine may loop or jump between states.

			Signals coming out of this board is
			* TC0, TC1, TC2, TC3, TC4 - The internal state of the flip-flops
			* TM0, TM1, TM2, TM3
			* TX
			* TP0, TP1, TP3, TP5, TP7, TP9, TP11, TP13, TP15 - Outputs from the state machine
			Most signals comes both in active high and low.

	==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.
	* 3 x 7400		* 3 x 7400 quad 2-input NAND gate
	* 2 x 74H00		* 2 x 74H00 quad 2-input NAND gate
	* 1 x 7402		* 1 x 7402 quad 2-input NOR gate
	* 7 x 7440		* 7 x 7440 dual 4-input NAND buffer
	* 5 x 74H51		* 5 x 74H51 dual 2-wide 2-input AND-OR-invert gate
	* 5 x 74H72		* 5 x 74H72 AND gated J-K master-slave flip-flop with asynchronous preset and clear
	* x 7474

	==Reference==		==Reference==

Gandalf: /* BOM */

2016-07-11T01:08:33Z

BOM

← Older revision		Revision as of 01:08, 11 July 2016
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	==BOM==		==BOM==
			This list contains the logic circuits used, passive components are not listed.
			* 3 x 7400
			* 2 x 74H00
			* 1 x 7402
			* 7 x 7440
			* 5 x 74H51
			* 5 x 74H72
			* x 7474

	==Reference==		==Reference==

Gandalf: Initial page

2016-07-08T20:42:27Z

Initial page

New page

'''151''' is a card that is used in the [[NORD-1]] CPU.
[[Image:NORD-1 card 151-c.jpg |300px | thumb | Component side.]]
[[Image:NORD-1 card 151-s.jpg |300px | thumb | Solder side.]]

{{Stub}}
==Introduction==

It is documented in drawing '''2A51'''.

==Switches and indicators==
There are no switches or indicators on this board, but there is a 5 kohm trimmer at the front

==BOM==

==Reference==
* HARDWARE MANUAL NORD 1
* Hardware in [[NORD-1 Serial 47]]

[[Category:NORD-1 hardware]]

151 (NORD-1 card) - Revision history

Gandalf: More info and a correction

Gandalf: /* BOM */

Gandalf: Initial page