Kempston Joystick - Revision history

Em00k at 09:35, 10 September 2025

2025-09-10T09:35:04Z

← Older revision		Revision as of 10:35, 10 September 2025
Line 3:		Line 3:
	\|NumberDec=31		\|NumberDec=31
	\|PortMask=%---- ---- 0001 1111		\|PortMask=%---- ---- 0001 1111
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston (Joystick/Gamepad) interface.
	\|Readable=Yes		\|Readable=Yes
	\|Writable=No		\|Writable=No

2020-05-04T11:13:42Z

← Older revision		Revision as of 12:13, 4 May 2020
Line 1:		Line 1:
	{{Port		{{Port
	\|Number=$xx1F		\|Number=$xx1F
			\|NumberDec=31
			\|PortMask=%---- ---- 0001 1111
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston interface.
	\|Readable=Yes		\|Readable=Yes
	\|Writable=No		\|Writable=No
	\|Subsystem=Input		\|Subsystem=Input
	~~\|PortMask=%---- ---- 0001 1111~~
	}}		}}
	{\| class="wikitable"		{\| class="wikitable"

2020-04-15T09:46:43Z

core 3.1.4 changes/refresh

← Older revision		Revision as of 10:46, 15 April 2020
Line 12:		Line 12:
	! Kempston joystick !! MD controller		! Kempston joystick !! MD controller
	\|-		\|-
	\| 7 \|\| 0 \|\| start~~/mode buttons~~		\| 7 \|\| 0 \|\| start button
	\|-		\|-
	\| 6 \|\| 0 \|\| A~~/X buttons~~		\| 6 \|\| 0 \|\| A button
	\|-		\|-
	\| 5 \|\| Fire 2 \|\| ~~B/Y buttons~~		\| 5 \|\| Fire 2 \|\| C button
	\|-		\|-
	\| 4 \|\| Fire 1 \|\| ~~C/Z buttons~~		\| 4 \|\| Fire 1 \|\| B button
	\|-		\|-
	\| 3 \|\|colspan="2"\| up		\| 3 \|\|colspan="2"\| up
Line 29:		Line 29:
	\|}		\|}
	For all bits 0 = not pressed / 1 = pressed		For all bits 0 = not pressed / 1 = pressed

			since core3.1.4 the X/Y/Z/mode buttons of 6-button controllers are not read by the FPGA (and Fire 1 is "B" button, this page and some other documentation was mentioning button "C", but seems like it was "B" all the time, or got remapped in core3.1.4).

			Note for non-programmers: the Next board does read fire1(B)/fire2(C)/A/start buttons of controller and provide the state for SW through this port, but that does not imply the SW will react to the extra buttons. Actually majority of legacy SW was not aware of existence of joysticks with more than one fire button, the "fire2" input in Kempston interface did appear very late in the life cycle of ZX when game producers already moved onto more modern platforms. So support for second fire button or full four button of MD pads needs to be present also in the code of the particular game, either patched version of legacy game, or new production designed for ZX Next.

2020-02-05T21:15:04Z

Adding bits info for Kempston/MD joystick reading

← Older revision		Revision as of 22:15, 5 February 2020
Line 7:		Line 7:
	\|PortMask=%---- ---- 0001 1111		\|PortMask=%---- ---- 0001 1111
	}}		}}
			{\| class="wikitable"
			!rowspan="2"\| Bit !!colspan="2"\| Function
			\|-
			! Kempston joystick !! MD controller
			\|-
			\| 7 \|\| 0 \|\| start/mode buttons
			\|-
			\| 6 \|\| 0 \|\| A/X buttons
			\|-
			\| 5 \|\| Fire 2 \|\| B/Y buttons
			\|-
			\| 4 \|\| Fire 1 \|\| C/Z buttons
			\|-
			\| 3 \|\|colspan="2"\| up
			\|-
			\| 2 \|\|colspan="2"\| down
			\|-
			\| 1 \|\|colspan="2"\| left
			\|-
			\| 0 \|\|colspan="2"\| right
			\|}
			For all bits 0 = not pressed / 1 = pressed

2019-04-15T12:45:36Z

← Older revision		Revision as of 13:45, 15 April 2019
Line 2:		Line 2:
	\|Number=$xx1F		\|Number=$xx1F
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston interface.
	~~\|PortMask=%---- ---- 0001 1111~~
	\|Readable=Yes		\|Readable=Yes
	\|Writable=No		\|Writable=No
	\|Subsystem=Input		\|Subsystem=Input
			\|PortMask=%---- ---- 0001 1111
	}}		}}

2019-04-14T10:00:15Z

7 revisions imported

← Older revision	Revision as of 11:00, 14 April 2019
(No difference)

2018-12-07T23:25:09Z

← Older revision		Revision as of 00:25, 8 December 2018
Line 2:		Line 2:
	\|Number=$xx1F		\|Number=$xx1F
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston interface.
	\|PortMask=%---- ---- ~~000- ----~~		\|PortMask=%---- ---- 0001 1111
	\|Readable=Yes		\|Readable=Yes
	\|Writable=No		\|Writable=No
	\|Subsystem=Input		\|Subsystem=Input
	}}		}}

2017-08-29T15:46:09Z

← Older revision		Revision as of 16:46, 29 August 2017
Line 1:		Line 1:
	{{Port		{{Port
	\|Number=$~~xx1f~~		\|Number=$xx1F
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston interface.
	\|PortMask=%---- ---- 000- ----		\|PortMask=%---- ---- 000- ----

2017-08-28T16:52:24Z

← Older revision		Revision as of 17:52, 28 August 2017
Line 2:		Line 2:
	\|Number=$xx1f		\|Number=$xx1f
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston interface.
	\|PortMask=%--------000-----		\|PortMask=%---- ---- 000- ----
	\|Readable=Yes		\|Readable=Yes
	\|Writable=No		\|Writable=No
	\|Subsystem=Input		\|Subsystem=Input
	}}		}}

2017-08-28T16:51:23Z

← Older revision		Revision as of 17:51, 28 August 2017
Line 2:		Line 2:
	\|Number=$xx1f		\|Number=$xx1f
	\|ShortDesc=Reads movement of joysticks using Kempston interface.		\|ShortDesc=Reads movement of joysticks using Kempston interface.
	\|PortMask=%--------000----c		\|PortMask=%--------000-----
	\|Readable=Yes		\|Readable=Yes
	\|Writable=No		\|Writable=No
	\|Subsystem=Input		\|Subsystem=Input
	}}		}}