Spectrum polish off - Revision history

Mahjongg at 21:07, 16 January 2016

2016-01-16T21:07:11Z

← Older revision		Revision as of 21:07, 16 January 2016
Line 17:		Line 17:
	* added a composite video output cable<br/>		* added a composite video output cable<br/>
	* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.<br/>		* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.<br/>
	The latter was also a test case for an identical solution in my ~~ZX14~~ (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using the 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.		The latter was also a test case for an identical solution in my ZX81+34 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using the 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.
	<br/>		<br/>

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	[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]		[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]

	Note that this spectrum, (and the CPC646 mentioned here) and about ~~a hundred~~ other systems in my possession, were donated to awesome space on good Friday (April 3) 2015 to awesome space http://awesomespace.nl.		Note that this spectrum, (and the CPC646 mentioned here) and about eighty other systems in my possession, were donated to awesome space on good Friday (April 3) 2015 to awesome space http://awesomespace.nl.

Mahjongg: Updated project data

2016-01-16T21:05:49Z

Updated project data

← Older revision		Revision as of 21:05, 16 January 2016
Line 1:		Line 1:
	{{Project		{{Project
	\|Name= Spectrum polish off		\|Name= Spectrum polish off
			\|Picture=Spectrum with real keys and joystick interface.JPG
			\|Omschrijving=repairing a Sinclair Spectrum and providing it with a new (real) keyboard, a Joystick port, composite video input, and a much more sensitive microphone input.
	\|Status= Completed		\|Status= Completed
	\|Contact= mahjongg		\|Contact= mahjongg
	}}		}}


	Sinclair Spectrum polish off is a project to restore a donated defective Sinclair spectrum to working order, and to add some additional features:<br />		Sinclair Spectrum polish off is a project to restore a donated defective Sinclair spectrum to working order, and to add some additional features:<br />

Line 20:		Line 20:
	<br/>		<br/>

	A less positive note is that even with the transistor pre-amp the cassette input is still quite finicky and still not ~~very~~ sensitive and needs a lot of signal to work properly.		A less positive note is that even with the transistor pre-amp the cassette input is still quite finicky and still not sensitive enough and needs a lot of signal to work properly.

	[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]		[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]

	Note that this spectrum, (and the CPC646 mentioned here) and about a hundred other systems in my possession, were donated to awesome space on good Friday (April 3) 2015 to awesome space http://awesomespace.nl.		Note that this spectrum, (and the CPC646 mentioned here) and about a hundred other systems in my possession, were donated to awesome space on good Friday (April 3) 2015 to awesome space http://awesomespace.nl.

Mahjongg at 17:45, 24 October 2015

2015-10-24T17:45:44Z

← Older revision		Revision as of 17:45, 24 October 2015
Line 23:		Line 23:

	[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]		[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]

			Note that this spectrum, (and the CPC646 mentioned here) and about a hundred other systems in my possession, were donated to awesome space on good Friday (April 3) 2015 to awesome space http://awesomespace.nl.

Mahjongg at 14:21, 29 May 2014

2014-05-29T14:21:56Z

← Older revision		Revision as of 14:21, 29 May 2014
Line 17:		Line 17:
	* added a composite video output cable<br/>		* added a composite video output cable<br/>
	* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.<br/>		* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.<br/>
	The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.		The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using the 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.
	<br/>		<br/>

Mahjongg at 14:21, 29 May 2014

2014-05-29T14:21:02Z

← Older revision		Revision as of 14:21, 29 May 2014
Line 16:		Line 16:
	* replaced a missing rubber feet<br/>		* replaced a missing rubber feet<br/>
	* added a composite video output cable<br/>		* added a composite video output cable<br/>
	* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.</br>		* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.<br/>
	The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.		The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.
	<br/>		<br/>

Mahjongg at 23:14, 28 May 2014

2014-05-28T23:14:19Z

← Older revision		Revision as of 23:14, 28 May 2014
Line 1:		Line 1:
	{{Project		{{Project
	\|Name= Spectrum polish off		\|Name= Spectrum polish off
	\|Status=~~completed~~		\|Status= Completed
	\|Contact= mahjongg		\|Contact= mahjongg
	}}		}}

Mahjongg at 23:13, 28 May 2014

2014-05-28T23:13:48Z

← Older revision		Revision as of 23:13, 28 May 2014
Line 1:		Line 1:
	{{Project		{{Project
	\|Name= Spectrum polish off		\|Name= Spectrum polish off
	\|Status=~~finished~~		\|Status=completed
	\|Contact= mahjongg		\|Contact= mahjongg
	}}		}}

Mahjongg at 23:13, 28 May 2014

2014-05-28T23:13:19Z

← Older revision		Revision as of 23:13, 28 May 2014
Line 1:		Line 1:
	{{Project		{{Project
	\|Name= Spectrum polish off		\|Name= Spectrum polish off
	\|Status=~~In progress~~		\|Status=finished
	\|Contact= mahjongg		\|Contact= mahjongg
	}}		}}

Mahjongg at 23:12, 28 May 2014

2014-05-28T23:12:57Z

← Older revision		Revision as of 23:12, 28 May 2014
Line 19:		Line 19:
	The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.		The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.
	<br/>		<br/>

	A less positive note is that even with the transistor pre-amp the cassette input is still quite finicky and still not very sensitive and needs a lot of signal to work properly.		A less positive note is that even with the transistor pre-amp the cassette input is still quite finicky and still not very sensitive and needs a lot of signal to work properly.

	[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]		[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]

Mahjongg at 23:12, 28 May 2014

2014-05-28T23:12:30Z

← Older revision		Revision as of 23:12, 28 May 2014
Line 18:		Line 18:
	* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.</br>		* Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.</br>
	The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.		The latter was also a test case for an identical solution in my ZX14 (ZX81 rebuild). It works, but only when using the right kind of FET's, the first FET's I tried (BS170's) did not work! Probably because of it's largish (200pF) drain-source and gate source capacitances, but using 2N7000 FET's did work. In the ZX14 I will be using 2N7002, which is a 2N7000 in a SOT-23 SMT package instead of the 2N7000's TO-92 PTH package.

	<br/>		<br/>
	A less positive note is that even with the transistor pre-amp the cassette input is still quite finicky and still not very sensitive and needs a lot of signal to work properly.		A less positive note is that even with the transistor pre-amp the cassette input is still quite finicky and still not very sensitive and needs a lot of signal to work properly.

	[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]		[[File:Spectrum with real keys and joystick interface.JPG\|900px\|Spectrum keyboard with real keys and joystick interface]]