Lange lichtkrant - Revision history

Bas at 22:08, 29 May 2024

2024-05-29T22:08:19Z

2022-05-08T08:29:55Z

Theory of operation

← Older revision		Revision as of 08:29, 8 May 2022
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	===Theory of operation===		===Theory of operation===
	Possibly the column data is contained in the top chain of 4x74HC595 on top of the board. There are 30 resistors there also, exactly the number of ~~rows~~.		Possibly the column data is contained in the top chain of 4x74HC595 on top of the board. There are 30 resistors there also, exactly the number of columns.

	Actuation of a row is probably done by the drivers inside the twin STA402A.		Actuation of a row is probably done by the drivers inside the twin STA402A.

2022-05-07T21:51:33Z

What

← Older revision		Revision as of 21:51, 7 May 2022
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	4x CDRom met software (Twee CD's hebben de installer van het lichtkrant-programeertooltje (MLN v2.20), verder een Cd met driver en CD met quick guide van de UDS1100 (met papieren boekje!)).		4x CDRom met software (Twee CD's hebben de installer van het lichtkrant-programeertooltje (MLN v2.20), verder een Cd met driver en CD met quick guide van de UDS1100 (met papieren boekje!)).
	1x Handleiding		1x Handleiding

			Next steps:
			* further reverse engineering of the display panels, e.g.
			* figure out how the shift registers are clocked
			* figure out how the data registers are connected
			* control one board to help understand how it works

	==Where==		==Where==

2022-05-07T21:37:59Z

Reverse engineering

← Older revision		Revision as of 21:37, 7 May 2022
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	Parts:		Parts:
	* 2x74HC245 (U1/U2): 8-bit ~~driver~~		* 2x74HC245 (U1/U2): 8-bit bus transceiver with 3-state output
	* 5x74HC595 (U3 and U4/U5/U6/U7): 8-bit serial shift register		* 5x74HC595 (U3 and U4/U5/U6/U7): 8-bit serial shift register
	* 1x74HC164 (U8): 8-bit serial-in, parallel-out shift register		* 1x74HC164 (U8): 8-bit serial-in, parallel-out shift register

2022-05-07T21:30:47Z

Reverse engineering

← Older revision		Revision as of 21:30, 7 May 2022
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	Parts:		Parts:
	* 2x74HC245: 8-bit driver		* 2x74HC245 (U1/U2): 8-bit driver
	* ~~1x74HC164~~: 8-bit serial~~-in, parallel-out~~ shift register		* 5x74HC595 (U3 and U4/U5/U6/U7): 8-bit serial shift register
	* ~~5x74HC595~~: 8-bit serial shift register		* 1x74HC164 (U8): 8-bit serial-in, parallel-out shift register
	* 2xSTA402A: quad PNP darlington		* 2xSTA402A: quad PNP darlington

	~~Likely the top chain of 595 controls the columns,~~
	~~and the PNP darlingtons on the bottom control the rows.~~

	Power is supplied separately from the 12-pin connector, left of the twin darlingon chips.		Power is supplied separately from the 12-pin connector, left of the twin darlingon chips.

2022-05-07T21:28:42Z

Theory of operation

← Older revision		Revision as of 21:28, 7 May 2022
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	===Theory of operation===		===Theory of operation===
	Possibly the ~~row~~ data is contained in the top chain of 4x74HC595 on top of the board. There are 30 resistors there also, exactly the number of rows.		Possibly the column data is contained in the top chain of 4x74HC595 on top of the board. There are 30 resistors there also, exactly the number of rows.

	Actuation of a row is probably done by the drivers inside the twin STA402A.		Actuation of a row is probably done by the drivers inside the twin STA402A.

2022-05-07T21:28:08Z

Reverse engineering

← Older revision		Revision as of 21:28, 7 May 2022
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	Parts:		Parts:
	* ~~74HC245~~: 8-bit driver		* 2x74HC245: 8-bit driver
	* ~~74HC164~~: 8-bit serial-in, parallel-out shift register		* 1x74HC164: 8-bit serial-in, parallel-out shift register
	* ~~74HC595~~: 8-bit serial shift register		* 5x74HC595: 8-bit serial shift register
	* ~~STA402A~~: quad PNP darlington		* 2xSTA402A: quad PNP darlington

	Likely the top chain of 595 controls the columns,		Likely the top chain of 595 controls the columns,
Line 62:		Line 62:

	===Theory of operation===		===Theory of operation===
	...		Possibly the row data is contained in the top chain of 4x74HC595 on top of the board. There are 30 resistors there also, exactly the number of rows.

			Actuation of a row is probably done by the drivers inside the twin STA402A.
			The 595 probably acts as the row selection registers, the twin 245's acting as buffer and twin STA402A's as driver.

			It is not completely clear what the 1x74HC164 does.

	==Foto's==		==Foto's==

2020-01-14T07:27:36Z

Reverse engineering

← Older revision		Revision as of 07:27, 14 January 2020
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	* 74HC595: 8-bit serial shift register		* 74HC595: 8-bit serial shift register
	* STA402A: quad PNP darlington		* STA402A: quad PNP darlington

	~~Chips~~
	* (top row, left to right): U8 (164), U7 (595), U6 (595), U5 (595), U4 (595)
	* (bot row, left to right): U3 (595), U2 (245), U1 (245)

	Likely the top chain of 595 controls the columns,		Likely the top chain of 595 controls the columns,

2020-01-12T18:33:26Z

Reverse engineering

← Older revision		Revision as of 18:33, 12 January 2020
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	* (top row, left to right): U8 (164), U7 (595), U6 (595), U5 (595), U4 (595)		* (top row, left to right): U8 (164), U7 (595), U6 (595), U5 (595), U4 (595)
	* (bot row, left to right): U3 (595), U2 (245), U1 (245)		* (bot row, left to right): U3 (595), U2 (245), U1 (245)

			Likely the top chain of 595 controls the columns,
			and the PNP darlingtons on the bottom control the rows.

			Power is supplied separately from the 12-pin connector, left of the twin darlingon chips.

	Connector (top right):		Connector (top right):

2020-01-12T18:22:29Z

Reverse engineering

← Older revision		Revision as of 18:22, 12 January 2020
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	* 12: ?		* 12: ?

	The panel has three identical connectors of 12 pins each.		The STA402A transistor base inputs are fed through the set of 7 resistors just left of U3 (595), very likely the row inputs.

			The panel has three identical connectors of 12 pins each (they are not electrically identical).

	===Theory of operation===		===Theory of operation===