Keymap High Address Register - Revision history

Sol HSA: updated to 78a6ee50

2024-11-03T11:35:55Z

updated to 78a6ee50

← Older revision		Revision as of 12:35, 3 November 2024
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	}}		}}
	Write:		Write:
	bits 7:1 = Reserved, must be 0		bit 7 = 0 to select ps2 keymap, 1 to select key joystick
			bits 6:1 = Reserved, must be 0
	bit 0 = MSB keymap address		bit 0 = MSB keymap address

2020-09-23T20:42:41Z

← Older revision		Revision as of 21:42, 23 September 2020
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=~~High~~ address ~~of Keymap (~~MSB ~~in bit 0)~~, read (pending) first byte of palette colour		\|ShortDesc=PS/2 Keymap address MSB, read (pending) first byte of palette colour
	}}		}}
	Write:		Write:

2019-11-11T16:16:50Z

core 3.0 changes/refresh

← Older revision		Revision as of 17:16, 11 November 2019
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=High address of Keymap (MSB in bit 0), read palette ~~half-value from $44~~		\|ShortDesc=High address of Keymap (MSB in bit 0), read (pending) first byte of palette colour
	}}		}}
	Write:		Write:
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	Read:		Read:

	bits 7:0 = Stored palette value from {{NextRegNo\|$44}}		bits 7:0 = Stored first-byte palette value from {{NextRegNo\|$44}}

	This value does update right after writing first 8 bits of colour to NextReg $44, while the palette entry is modified only after the second write (adding ninth bit and L2 priority bit) is done. So half-written value can't be read back through {{NextRegNo\|$41}}, but can be read with this register.		This value does update right after writing first 8 bits of colour to NextReg $44, while the real palette entry is modified only after the second write (adding ninth bit and L2 priority bit) is done. So half-written value can't be read back through {{NextRegNo\|$41}}, but can be read with this register (after writing second byte to $44, this register still reads the first byte value, but the change is also committed to the palette itself and visible by reading $41 + $44 registers).

2019-11-11T16:01:34Z

core 3.0 changes/refresh

← Older revision		Revision as of 17:01, 11 November 2019
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=High address of Keymap (MSB in bit 0), read palette value from $44		\|ShortDesc=High address of Keymap (MSB in bit 0), read palette half-value from $44
	}}		}}
	Write:		Write:
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	Read:		Read:

	bits 7:0 = Stored palette value from {{NextRegNo\|$44}}		bits 7:0 = Stored palette value from {{NextRegNo\|$44}}

			This value does update right after writing first 8 bits of colour to NextReg $44, while the palette entry is modified only after the second write (adding ninth bit and L2 priority bit) is done. So half-written value can't be read back through {{NextRegNo\|$41}}, but can be read with this register.

2019-11-11T13:56:36Z

core 3.0 changes/refresh

← Older revision		Revision as of 14:56, 11 November 2019
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	{{NextRegister		{{NextRegister
	\|Number=$28		\|Number=$28
	\|Readable=No		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=High address of Keymap (MSB in bit 0)		\|ShortDesc=High address of Keymap (MSB in bit 0), read palette value from $44
	}}		}}
	~~Bits~~ 7-1 ~~are reserved~~, must be 0~~. Bit~~ 0 is MSB of keymap address.		Write:
			bits 7:1 = Reserved, must be 0
			bit 0 = MSB keymap address

			Read:
			bits 7:0 = Stored palette value from {{NextRegNo\|$44}}

2019-04-14T10:00:15Z

4 revisions imported

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

2018-12-22T20:13:09Z

← Older revision		Revision as of 21:13, 22 December 2018
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	\|Number=$28		\|Number=$28
	\|Readable=No		\|Readable=No
	\|Writable=No		\|Writable=Yes
			\|ShortDesc=High address of Keymap (MSB in bit 0)
	}}		}}
			Bits 7-1 are reserved, must be 0. Bit 0 is MSB of keymap address.

2017-08-18T23:42:58Z

2017-08-15T00:23:23Z

2017-08-14T19:29:24Z

Created page with "{{NextRegister |Number=40 |Readable=No |Writable=No }}"

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