PAL Coco Differences - Revision history

Carney: /* France */

2024-10-01T19:46:43Z

France

← Older revision		Revision as of 15:46, 1 October 2024
Line 54:		Line 54:
	* Field period: 1/50 s = 20 ms		* Field period: 1/50 s = 20 ms

	The French CoCo PCBs have an additional +12V voltage generator on board, which is output along with R, G, B, H+V (which is AFAIR actually a composite sync signal) on a small Mini-DIN connector. Then you need a special Mini-DIN to Péritel (=Euro-SCART) cable, which contains voltage ~~devider~~ to create switch voltages which set the video sink (the TV) to RGB mode (rest-of-Europe SCART often runs on composite video mode only).		The French CoCo PCBs have an additional +12V voltage generator on board, which is output along with R, G, B, H+V (which is AFAIR actually a composite sync signal) on a small Mini-DIN connector. Then you need a special Mini-DIN to Péritel (=Euro-SCART) cable, which contains a voltage divider to create switch voltages which set the video sink (the TV) to RGB mode (rest-of-Europe SCART often runs on composite video mode only).

Carney: /* United Kingdom */

2024-10-01T19:45:59Z

United Kingdom

← Older revision		Revision as of 15:45, 1 October 2024
Line 31:		Line 31:
	== United Kingdom ==		== United Kingdom ==

	There's another type sold in United Kingdom (Great Britain [England, Scotland, Wales] and Northern Ireland), I assume this one follows PAL-I standard (difference to PAL G: Video band-width is 5.5 Mhz [instead of 5.0 MHz], Vestigial side-band is 1.25 MHz [instead of 0.75 MHz] and the audio carrier is at 6.0 MHz [instead of 5.5 Mhz]). The latter has the effect, that on a PAL G TV you can either have the sound correctly tuned or the image. It was rather using VHF (0.03-0.3 GHz) [instead of UHF], so it had the "Channel 3(?) or 4(?)" select switch.		There's another type sold in the United Kingdom (Great Britain [England, Scotland, Wales] and Northern Ireland), I assume this one follows PAL-I standard (difference to PAL G: Video band-width is 5.5 Mhz [instead of 5.0 MHz], Vestigial side-band is 1.25 MHz [instead of 0.75 MHz] and the audio carrier is at 6.0 MHz [instead of 5.5 Mhz]). The latter has the effect, that on a PAL G TV you can either have the sound correctly tuned or the image. It was rather using VHF (0.03-0.3 GHz) [instead of UHF], so it had the "Channel 3(?) or 4(?)" select switch.

	== Australia ==		== Australia ==

MagicFab: /* Germany, Belgium and the Netherlands */

2024-09-11T01:33:51Z

Germany, Belgium and the Netherlands

← Older revision		Revision as of 21:33, 10 September 2024
Line 12:		Line 12:
	originally kind of reserved for this purpose: computers, video recorders, etc.		originally kind of reserved for this purpose: computers, video recorders, etc.

	In times ~~where~~ you only had 3 ~~terestrical~~ analog TV programs and not yet SCART and/or composite video inputs in your TV sets)~~. A~~ channel switch was not present (the corresponding hole in the CoCo's case was covered by a plate reading "Channel 36").		In times when you only had 3 terrestrial analog TV programs and not yet SCART and/or composite video inputs in your TV sets), a channel switch was not present (the corresponding hole in the CoCo's case was covered by a plate reading "Channel 36").

	Some key data for PAL-G:		Some key data for PAL-G:

MagicFab: /* A guide to the various PAL Coco systems */

2024-09-11T01:32:04Z

A guide to the various PAL Coco systems

← Older revision		Revision as of 21:32, 10 September 2024
Line 1:		Line 1:
	{{NavArticles}}		{{NavArticles}}
	== A guide to the various PAL Coco systems ==		= A guide to the various PAL Coco systems =

	Some other things just came to my mind (which is a little bit rusty after all		Some other things just came to my mind (which is a little bit rusty after all
	these years):		these years):

	I own PAL CoCos (and MC-10s) from different areas and they are all slightly		I own PAL CoCos (and MC-10s) from different areas and they are all slightly different.
	different.

	AFAIR, there's one group which has been sold in Germany, Belgium & the		== Germany, Belgium and the Netherlands ==
	Netherlands (CoCo 1 to 2B). These are following the PAL-G standard and have a
	modulated RF video out on UHF (0.3-3.0 GHz) channel 36 (this channel was		AFAIR, there's one group which has been sold in Germany, Belgium & the Netherlands (CoCo 1 to 2B). These are following the PAL-G standard and have a modulated RF video out on UHF (0.3-3.0 GHz) channel 36 (this channel was
	originally kind of reserved for this purpose: computers, video recorders, etc.		originally kind of reserved for this purpose: computers, video recorders, etc.
	In times where you only had 3 terestrical analog TV programs and not yet SCART
	and/or composite video inputs in your TV sets). A channel switch was not		In times where you only had 3 terestrical analog TV programs and not yet SCART and/or composite video inputs in your TV sets). A channel switch was not present (the corresponding hole in the CoCo's case was covered by a plate reading "Channel 36").
	present (the corresponding hole in the CoCo's case was covered by a plate
	reading "Channel 36").

	Some key data for PAL-G:		Some key data for PAL-G:

MagicFab: /* A guide to the various PAL Coco systems */ Cleanup

2024-09-11T01:30:56Z

A guide to the various PAL Coco systems: Cleanup

← Older revision		Revision as of 21:30, 10 September 2024
Line 17:		Line 17:
	reading "Channel 36").		reading "Channel 36").

	Some key ~~dates~~ for PAL-G:		Some key data for PAL-G:

	*Vertical scan lines: 625		* Vertical scan lines: 625
	*Vertical frequency: 50 Hz		* Vertical frequency: 50 Hz
	*Horizontal frequency: 15.625 kHz		* Horizontal frequency: 15.625 kHz
	*Video band-width: 5.0 MHz		* Video band-width: 5.0 MHz
	*Audio carrier: 5.5 MHz		* Audio carrier: 5.5 MHz
	*Color subcarrier frequency: 4.43361875 MHz		* Color subcarrier frequency: 4.43361875 MHz
	*Channel spacing: 8 MHz		* Channel spacing: 8 MHz
	*Vision modulation type: AM		* Vision modulation type: AM
	*Vision modulation polarity: negative		* Vision modulation polarity: negative
	*Sound modulation: FM		* Sound modulation: FM
	*Vestigial side-band: 0.75 MHz		* Vestigial side-band: 0.75 MHz
	*Field period: 1/50 s = 20 ms		* Field period: 1/50 s = 20 ms

	~~There's another type sold in~~ United Kingdom ~~(Great Britain [England, Scotland,~~		== United Kingdom ==
	~~Wales] and Northern Ireland), I assume this one follows PAL-I standard~~
	~~(difference to PAL G: Video band-width is 5.5 Mhz [instead of 5.0 MHz],~~
	~~Vestigial side-band is 1.25 MHz [instead of 0.75 MHz] and the audio carrier is~~
	~~at 6.0 MHz [instead of 5.5 Mhz]). The latter has the effect, that on a PAL G TV~~
	~~you can either have the sound correctly tuned or the image. It was rather using~~
	~~VHF (0.03-0.3 GHz) [instead of UHF], so it had the "Channel 3(?) or 4(?)"~~
	~~select switch.~~

	~~From Australia~~, I ~~got at least some~~ PAL ~~CoCo3~~ (~~the~~ PAL ~~CoCo3 had never been~~		There's another type sold in United Kingdom (Great Britain [England, Scotland, Wales] and Northern Ireland), I assume this one follows PAL-I standard (difference to PAL G: Video band-width is 5.5 Mhz [instead of 5.0 MHz], Vestigial side-band is 1.25 MHz [instead of 0.75 MHz] and the audio carrier is at 6.0 MHz [instead of 5.5 Mhz]). The latter has the effect, that on a PAL G TV you can either have the sound correctly tuned or the image. It was rather using VHF (0.03-0.3 GHz) [instead of UHF], so it had the "Channel 3(?) or 4(?)" select switch.
	~~sold in Europe~~, ~~because Tandy/RadioShack closed its stores in~~ the ~~time the~~
	~~CoCo3 came out~~. ~~The CoCo2B~~ [~~lower-case, 6847-T1 VDG~~] ~~was never officially~~
	~~available in Germany, but I got one with a very low serial number which was a~~
	~~demonstrator from our local store~~). ~~Australia~~ has PAL B/G~~, and AFAIR~~ the
	~~machines have~~ the VHF ~~"channel 2~~(?) & 3(?)~~" switches, so I assume CoCo3s are~~
	~~PAL-B machines. However, you would rather use the composite video out~~ or ~~the~~
	~~RGB out with a CoCo 3 and not the RF modulator. Composite video out is~~
	~~generated from the RGB out with a piggy-backed satellite board, the GIME's NTSC~~
	~~composite out is not connected on PAL boards. The PAL CoCo3 has a modified PAL~~
	~~ROM too~~ (~~initializing the GIME to 50Hz video timing~~).

	~~The strangest group of machines (CoCo1 to CoCo2B) come from France. These have~~		== Australia ==
	~~a French AZERTY keyboard layout [instead of QWERTY in both the US and the rest~~
	~~of Europe, at least in Germany we would have prefered a QWERTZ layout, but~~
	~~noone cared :-)]. The modulator has been completely replaced by a VDG to RGB~~
	~~circuit, which is compatible with the French SECAM-L TVs. For the sake of~~
	~~completeness, a SECAM-L RF modulator would have to comply with the following (I~~
	~~think they were sold as an external device):~~

	*Vertical scan lines: 625		From Australia, I got at least some PAL CoCo3. The PAL CoCo3 had never been sold in Europe because Tandy / RadioShack closed its stores in the time the CoCo3 came out. The CoCo2B [lower-case, 6847-T1 VDG] was never officially available in Germany, but I got one with a very low serial number which was a demonstrator from our local store). Australia has PAL B/G, and AFAIR the machines have the VHF "channel 2(?) & 3(?)" switches, so I assume CoCo3s are PAL-B machines. However, you would rather use the composite video out or the RGB out with a CoCo 3 and not the RF modulator. Composite video out is generated from the RGB out with a piggy-backed satellite board, the GIME's NTSC composite out is not connected on PAL boards. The PAL CoCo3 has a modified PAL ROM too (initializing the GIME to 50Hz video timing).
	*Vertical frequency: 50 Hz
	*Horizontal frequency: 15.~~625 kHz~~
	*Video band-~~width: 6~~.~~0 MHz~~
	*Audio carrier: 6.~~5 MHz~~
	*Color subcarrier frequency: 4.~~406250 MHz/ 4~~.~~250 MHz~~
	*Channel spacing: 8 MHz
	*Vision modulation type: AM
	*Vision modulation polarity: positive
	*Sound modulation: AM
	*Vestigial side-band: 1.~~25 MHz~~
	*Field period: 1/50 s = 20 ms

	~~The French CoCo PCBs have an additional +12V voltage generator on board, which~~		== France ==
	~~is output along with R, G, B, H+V (which is AFAIR actually a composite sync~~
	~~signal) on a small Mini-DIN connector. Then you need a special Mini-DIN to~~
	~~Péritel (~~=~~Euro-SCART) cable, which contains voltage devider to create switch~~
	~~voltages which set the video sink (the TV) to RGB mode (rest-of-Europe SCART~~
	~~often runs on composite video mode only).~~

	~~Hope that~~ is ~~kind~~ of ~~interesting~~ (~~depite it doesn't solve your problem yet~~).		The strangest group of machines (CoCo1 to CoCo2B) come from France. These have a French AZERTY keyboard layout [instead of QWERTY in both the US and the rest of Europe, at least in Germany a QWERTZ layout would have been preferred, but none cared :-)]. The modulator has been completely replaced by a VDG to RGB circuit, which is compatible with the French SECAM-L TVs. For the sake of completeness, a SECAM-L RF modulator would have to comply with the following (I think they were sold as an external device):

	~~Best regards~~,		* Vertical scan lines: 625
	~~Torsten~~		* Vertical frequency: 50 Hz
			* Horizontal frequency: 15.625 kHz
			* Video band-width: 6.0 MHz
			* Audio carrier: 6.5 MHz
			* Color subcarrier frequency: 4.406250 MHz/ 4.250 MHz
			* Channel spacing: 8 MHz
			* Vision modulation type: AM
			* Vision modulation polarity: positive
			* Sound modulation: AM
			* Vestigial side-band: 1.25 MHz
			* Field period: 1/50 s = 20 ms

			The French CoCo PCBs have an additional +12V voltage generator on board, which is output along with R, G, B, H+V (which is AFAIR actually a composite sync signal) on a small Mini-DIN connector. Then you need a special Mini-DIN to Péritel (=Euro-SCART) cable, which contains voltage devider to create switch voltages which set the video sink (the TV) to RGB mode (rest-of-Europe SCART often runs on composite video mode only).

Soundchaser: Created page with "{{NavArticles}} == A guide to the various PAL Coco systems == Some other things just came to my mind (which is a little bit rusty after all these years): I own PAL CoCos (a..."

2013-02-28T16:40:20Z

Created page with "{{NavArticles}} == A guide to the various PAL Coco systems == Some other things just came to my mind (which is a little bit rusty after all these years): I own PAL CoCos (a..."

New page

{{NavArticles}}
== A guide to the various PAL Coco systems ==

Some other things just came to my mind (which is a little bit rusty after all
these years):

I own PAL CoCos (and MC-10s) from different areas and they are all slightly
different.

AFAIR, there's one group which has been sold in Germany, Belgium & the
Netherlands (CoCo 1 to 2B). These are following the PAL-G standard and have a
modulated RF video out on UHF (0.3-3.0 GHz) channel 36 (this channel was
originally kind of reserved for this purpose: computers, video recorders, etc.
In times where you only had 3 terestrical analog TV programs and not yet SCART
and/or composite video inputs in your TV sets). A channel switch was not
present (the corresponding hole in the CoCo's case was covered by a plate
reading "Channel 36").

Some key dates for PAL-G:

*Vertical scan lines: 625
*Vertical frequency: 50 Hz
*Horizontal frequency: 15.625 kHz
*Video band-width: 5.0 MHz
*Audio carrier: 5.5 MHz
*Color subcarrier frequency: 4.43361875 MHz
*Channel spacing: 8 MHz
*Vision modulation type: AM
*Vision modulation polarity: negative
*Sound modulation: FM
*Vestigial side-band: 0.75 MHz
*Field period: 1/50 s = 20 ms

There's another type sold in United Kingdom (Great Britain [England, Scotland,
Wales] and Northern Ireland), I assume this one follows PAL-I standard
(difference to PAL G: Video band-width is 5.5 Mhz [instead of 5.0 MHz],
Vestigial side-band is 1.25 MHz [instead of 0.75 MHz] and the audio carrier is
at 6.0 MHz [instead of 5.5 Mhz]). The latter has the effect, that on a PAL G TV
you can either have the sound correctly tuned or the image. It was rather using
VHF (0.03-0.3 GHz) [instead of UHF], so it had the "Channel 3(?) or 4(?)"
select switch.

From Australia, I got at least some PAL CoCo3 (the PAL CoCo3 had never been
sold in Europe, because Tandy/RadioShack closed its stores in the time the
CoCo3 came out. The CoCo2B [lower-case, 6847-T1 VDG] was never officially
available in Germany, but I got one with a very low serial number which was a
demonstrator from our local store). Australia has PAL B/G, and AFAIR the
machines have the VHF "channel 2(?) & 3(?)" switches, so I assume CoCo3s are
PAL-B machines. However, you would rather use the composite video out or the
RGB out with a CoCo 3 and not the RF modulator. Composite video out is
generated from the RGB out with a piggy-backed satellite board, the GIME's NTSC
composite out is not connected on PAL boards. The PAL CoCo3 has a modified PAL
ROM too (initializing the GIME to 50Hz video timing).

The strangest group of machines (CoCo1 to CoCo2B) come from France. These have
a French AZERTY keyboard layout [instead of QWERTY in both the US and the rest
of Europe, at least in Germany we would have prefered a QWERTZ layout, but
noone cared :-)]. The modulator has been completely replaced by a VDG to RGB
circuit, which is compatible with the French SECAM-L TVs. For the sake of
completeness, a SECAM-L RF modulator would have to comply with the following (I
think they were sold as an external device):

*Vertical scan lines: 625
*Vertical frequency: 50 Hz
*Horizontal frequency: 15.625 kHz
*Video band-width: 6.0 MHz
*Audio carrier: 6.5 MHz
*Color subcarrier frequency: 4.406250 MHz/ 4.250 MHz
*Channel spacing: 8 MHz
*Vision modulation type: AM
*Vision modulation polarity: positive
*Sound modulation: AM
*Vestigial side-band: 1.25 MHz
*Field period: 1/50 s = 20 ms

The French CoCo PCBs have an additional +12V voltage generator on board, which
is output along with R, G, B, H+V (which is AFAIR actually a composite sync
signal) on a small Mini-DIN connector. Then you need a special Mini-DIN to
Péritel (=Euro-SCART) cable, which contains voltage devider to create switch
voltages which set the video sink (the TV) to RGB mode (rest-of-Europe SCART
often runs on composite video mode only).

Hope that is kind of interesting (depite it doesn't solve your problem yet).

Best regards,
Torsten