LK Links - Revision history

Arnoldemu: /* LK4 - Screen Refresh Rate */

2017-08-11T19:35:18Z

LK4 - Screen Refresh Rate

← Older revision		Revision as of 19:35, 11 August 2017
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	== LK4 - Screen Refresh Rate ==		== LK4 - Screen Refresh Rate ==

	LK4 connects to [[8255\|PPI]] Port B, Bit4. The link tells the BIOS whether it should set-up the [[CRTC]] for 50Hz or 60Hz refresh rate.		LK4 (LK104 on Plus/GX4000/Costdown) connects to [[8255\|PPI]] Port B, Bit4. The link tells the BIOS whether it should set-up the [[CRTC]] for 50Hz or 60Hz refresh rate.

	Default is LK4 not installed (50Hz).		Default is LK4 not installed (50Hz).

Arnoldemu: /* LK1,LK2,LK3 - Manufacturer ID */

2017-08-11T19:34:30Z

LK1,LK2,LK3 - Manufacturer ID

← Older revision		Revision as of 19:34, 11 August 2017
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	== LK1,LK2,LK3 - Manufacturer ID ==		== LK1,LK2,LK3 - Manufacturer ID ==

	LK1,LK2,LK3 connect to [[8255\|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed ([[Amstrad]]). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models. For more info see [[LK-selectable Brand Names]].		LK1,LK2,LK3 connect to [[8255\|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000/Costdown schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed ([[Amstrad]]). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models. For more info see [[LK-selectable Brand Names]].

	== LK4 - Screen Refresh Rate ==		== LK4 - Screen Refresh Rate ==

MacDeath at 20:47, 17 December 2010

2010-12-17T20:47:02Z

← Older revision		Revision as of 20:47, 17 December 2010
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			[[Category:CPC Internal Components]]
	'''Links''' - Amstrad has used a number of LKs (Links) on CPC mainboards and on peripherals like DDI-1 and CPC+ Cartridges. The LKs are simply a piece of wire that is (or is not) installed between two soldering points.		'''Links''' - Amstrad has used a number of LKs (Links) on CPC mainboards and on peripherals like DDI-1 and CPC+ Cartridges. The LKs are simply a piece of wire that is (or is not) installed between two soldering points.

Nocash: Undo revision 61602 by TFM - AMSDOS uses CALL B912 for deciding whether to boot CPM, as far as known AMSDOS doesn't check PPI inputs, so LK5 must affect ROM banking - correct me if that's wrong!

2010-10-07T17:12:37Z

Undo revision 61602 by TFM - AMSDOS uses CALL B912 for deciding whether to boot CPM, as far as known AMSDOS doesn't check PPI inputs, so LK5 must affect ROM banking - correct me if that's wrong!

← Older revision		Revision as of 17:12, 7 October 2010
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	* LK1-LK4 - same as CPC, though not being actually used, due to absent BIOS (though game cartridges could check LK4 to determine the desired video refresh rate) (default is LK1-LK4 not installed, equivalent to Video=50Hz, and Manufacturer=Amstrad)		* LK1-LK4 - same as CPC, though not being actually used, due to absent BIOS (though game cartridges could check LK4 to determine the desired video refresh rate) (default is LK1-LK4 not installed, equivalent to Video=50Hz, and Manufacturer=Amstrad)
	* LK5 - none such (corresponding PPI input is floating, neither having a LOW level, nor a stable HIGH level) (~~This~~ seems to be the reason for the CPC+ System Cartridge not booting properly on the GX4000~~. If the AMSDOS senses the wrong signal, it tries to boot CP/M~~)		* LK5 - none such (corresponding PPI input is floating, neither having a LOW level, nor a stable HIGH level) (meaning the ROM Bank0=BASIC and Bank7=AMSDOS are unstable on GX4000, this seems to be the reason for the CPC+ System Cartridge not booting properly on the GX4000)
	* LK6 - unknown (same as LK106 on CPC+) (usually LK6 is not installed, neither in GX4000 nor CPC+)		* LK6 - unknown (same as LK106 on CPC+) (usually LK6 is not installed, neither in GX4000 nor CPC+)
	* LK7 - shortcut +5V with +5VMOD (installed in french version, which has no TV modulator)		* LK7 - shortcut +5V with +5VMOD (installed in french version, which has no TV modulator)

TFM: /* GX4000:LKs */ The state of the LK has NO influence on the ROM banking, it is just read and used by AMSDOS.

2010-10-04T02:19:54Z

GX4000:LKs: The state of the LK has NO influence on the ROM banking, it is just read and used by AMSDOS.

← Older revision		Revision as of 02:19, 4 October 2010
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	* LK1-LK4 - same as CPC, though not being actually used, due to absent BIOS (though game cartridges could check LK4 to determine the desired video refresh rate) (default is LK1-LK4 not installed, equivalent to Video=50Hz, and Manufacturer=Amstrad)		* LK1-LK4 - same as CPC, though not being actually used, due to absent BIOS (though game cartridges could check LK4 to determine the desired video refresh rate) (default is LK1-LK4 not installed, equivalent to Video=50Hz, and Manufacturer=Amstrad)
	* LK5 - none such (corresponding PPI input is floating, neither having a LOW level, nor a stable HIGH level) (~~meaning the ROM Bank0=BASIC and Bank7=AMSDOS are unstable on GX4000, this~~ seems to be the reason for the CPC+ System Cartridge not booting properly on the GX4000)		* LK5 - none such (corresponding PPI input is floating, neither having a LOW level, nor a stable HIGH level) (This seems to be the reason for the CPC+ System Cartridge not booting properly on the GX4000. If the AMSDOS senses the wrong signal, it tries to boot CP/M)
	* LK6 - unknown (same as LK106 on CPC+) (usually LK6 is not installed, neither in GX4000 nor CPC+)		* LK6 - unknown (same as LK106 on CPC+) (usually LK6 is not installed, neither in GX4000 nor CPC+)
	* LK7 - shortcut +5V with +5VMOD (installed in french version, which has no TV modulator)		* LK7 - shortcut +5V with +5VMOD (installed in french version, which has no TV modulator)

Nocash: /* LK1,LK2,LK3 - Manufacturer ID */

2010-04-26T20:58:36Z

LK1,LK2,LK3 - Manufacturer ID

@@ Line 5: / Line 5: @@
 == LK1,LK2,LK3 - Manufacturer ID ==
-LK1,LK2,LK3 connect to [[8255|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed (Amstrad). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models.
+LK1,LK2,LK3 connect to [[8255|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed ([[Amstrad]]). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models. For more info see [[LK-selectable Brand Names]].
 == LK4 - Screen Refresh Rate ==

Nocash: /* LK1,LK2,LK3 - Manufacturer ID */

2010-04-26T14:15:58Z

LK1,LK2,LK3 - Manufacturer ID

← Older revision		Revision as of 14:15, 26 April 2010
Line 6:		Line 6:

	LK1,LK2,LK3 connect to [[8255\|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed (Amstrad). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models.		LK1,LK2,LK3 connect to [[8255\|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed (Amstrad). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models.

			{\|{{Prettytable\|width: 700px; font-size: 2em;}}
			\|''Bit 3 (LK3)''\|\|''Bit 2 (LK2)''\|\|''Bit 1 (LK1)''\|\|''Manufacturer Name''
			\|-
			\|0\|\|0\|\|0\|\|[[Isp]]
			\|-
			\|0\|\|0\|\|1\|\|[[Triumph]]
			\|-
			\|0\|\|1\|\|0\|\|[[Saisho]]
			\|-
			\|0\|\|1\|\|1\|\|[[Solavox]]
			\|-
			\|1\|\|0\|\|0\|\|[[Awa]] (australian CPCs)
			\|-
			\|1\|\|0\|\|1\|\|[[Schneider]] (german CPCs)
			\|-
			\|1\|\|1\|\|0\|\|[[Orion]]
			\|-
			\|1\|\|1\|\|1\|\|[[Amstrad]] (default)
			\|-
			\|}

			Note: "0" means LK installed.

	== LK4 - Screen Refresh Rate ==		== LK4 - Screen Refresh Rate ==

Nocash: /* LK1,LK2,LK3 - Manufacturer ID */

2010-04-23T11:14:06Z

LK1,LK2,LK3 - Manufacturer ID

← Older revision		Revision as of 11:14, 23 April 2010
Line 5:		Line 5:
	== LK1,LK2,LK3 - Manufacturer ID ==		== LK1,LK2,LK3 - Manufacturer ID ==

	LK1,LK2,LK3 connect to [[8255\|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed (~~except,~~ LK2 is installed in german ~~Scheider~~ models).		LK1,LK2,LK3 connect to [[8255\|PPI]] Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed (Amstrad). Other combinations are LK2 installed in german [[Schneider]] models, and LK1+LK2 in australian [[Awa]] models.

	== LK4 - Screen Refresh Rate ==		== LK4 - Screen Refresh Rate ==

Nocash: /* LK4 - Screen Refresh Rate */

2010-04-20T20:55:02Z

LK4 - Screen Refresh Rate

← Older revision		Revision as of 20:55, 20 April 2010
Line 13:		Line 13:

	It might be installed in US models, there isn't too much known about whether CPCs were exported to USA.... One source says that the CPC6128 was initially sold ''only'' in USA... Another source says that Indescomp (spanish distributor) produced CPCs with ''Indescomp International U.S.A.'' stickers.		It might be installed in US models, there isn't too much known about whether CPCs were exported to USA.... One source says that the CPC6128 was initially sold ''only'' in USA... Another source says that Indescomp (spanish distributor) produced CPCs with ''Indescomp International U.S.A.'' stickers.

			The 60Hz setting may cause compatibility problems with various non-BIOS software. And, due to a BIOS glitch, even with BIOS-based software (see [[Media:S968ap13.pdf\|SOFT 968 Appendix 13 (XIII) (Hints Tips and Workarounds)]] for details).

	== CPC6128:LK5,LK6,LK8 - Disable 128K RAM Banking ==		== CPC6128:LK5,LK6,LK8 - Disable 128K RAM Banking ==

Nocash: /* LK4 - Screen Refresh Rate */

2010-04-10T16:45:51Z

LK4 - Screen Refresh Rate

← Older revision		Revision as of 16:45, 10 April 2010
Line 10:		Line 10:

	LK4 connects to [[8255\|PPI]] Port B, Bit4. The link tells the BIOS whether it should set-up the [[CRTC]] for 50Hz or 60Hz refresh rate.		LK4 connects to [[8255\|PPI]] Port B, Bit4. The link tells the BIOS whether it should set-up the [[CRTC]] for 50Hz or 60Hz refresh rate.
			Default is LK4 not installed (50Hz).

			It might be installed in US models, there isn't too much known about whether CPCs were exported to USA.... One source says that the CPC6128 was initially sold ''only'' in USA... Another source says that Indescomp (spanish distributor) produced CPCs with ''Indescomp International U.S.A.'' stickers.

	== CPC6128:LK5,LK6,LK8 - Disable 128K RAM Banking ==		== CPC6128:LK5,LK6,LK8 - Disable 128K RAM Banking ==