Plus 3 Memory Paging Control - Revision history

Johnnyo: link the port

2026-02-22T22:51:47Z

link the port

← Older revision		Revision as of 23:51, 22 February 2026
Line 15:		Line 15:
	\| 7-3 \|\| Unused, use 0 (Printer Port Strobe b4 and Disk motor enable b3 are not implemented in core3.0)		\| 7-3 \|\| Unused, use 0 (Printer Port Strobe b4 and Disk motor enable b3 are not implemented in core3.0)
	\|-		\|-
	\| 2 \|\| Normal mode: High bit of ROM selection. Together with bit 4 from $7FFD port:		\| 2 \|\| Normal mode: High bit of ROM selection. Together with bit 4 from {{PortNo\|$7FFD}} port:
	00 = ROM0 = 128K editor and menu system		00 = ROM0 = 128K editor and menu system
	01 = ROM1 = 128K syntax checker		01 = ROM1 = 128K syntax checker

2020-05-04T11:17:01Z

← Older revision		Revision as of 12:17, 4 May 2020
Line 1:		Line 1:
	{{Port		{{Port
	\|Number=$1FFD		\|Number=$1FFD
			\|NumberDec=8189
			\|PortMask=%0001 ---- ---- --0-
	\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.		\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.
	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes
	\|Subsystem=Memory map		\|Subsystem=Memory map
	~~\|PortMask=%0001 ---- ---- --0-~~
	}}		}}
	Bit mapped to control paging options.		Bit mapped to control paging options.

2019-12-31T10:20:47Z

adding info

← Older revision		Revision as of 11:20, 31 December 2019
Line 14:		Line 14:
	\| 7-3 \|\| Unused, use 0 (Printer Port Strobe b4 and Disk motor enable b3 are not implemented in core3.0)		\| 7-3 \|\| Unused, use 0 (Printer Port Strobe b4 and Disk motor enable b3 are not implemented in core3.0)
	\|-		\|-
	\| 2 \|\| Normal mode: High bit of ROM selection.		\| 2 \|\| Normal mode: High bit of ROM selection. Together with bit 4 from $7FFD port:
			00 = ROM0 = 128K editor and menu system
			01 = ROM1 = 128K syntax checker
			10 = ROM2 = +3DOS
			11 = ROM3 = 48K BASIC

	Special mode: High bit of memory configuration number (see [[Memory map]]).		Special mode: High bit of memory configuration number (see [[Memory map]]).

2019-10-04T05:41:59Z

← Older revision		Revision as of 06:41, 4 October 2019
Line 12:		Line 12:
	! Bit !! Effect		! Bit !! Effect
	\|-		\|-
	\| 5-7 \|\| ~~Undocumented~~, ~~may be used for extra bits of slot 4 bank select~~ (~~see {{PortNo\|$7FFD}})~~		\| 7-3 \|\| Unused, use 0 (Printer Port Strobe b4 and Disk motor enable b3 are not implemented in core3.0)
	\|-
	~~\| 4 \|\|~~ Printer Port Strobe
	\|-
	~~\| 3 \|\|~~ Disk motor enable
	\|-		\|-
	\| 2 \|\| Normal mode: High bit of ROM selection.		\| 2 \|\| Normal mode: High bit of ROM selection.

2019-10-03T21:17:44Z

core 3.0 changes

← Older revision		Revision as of 22:17, 3 October 2019
Line 28:		Line 28:

	Any values written to this port should also be stored in $5B67 if you intend to use any OS routines.		Any values written to this port should also be stored in $5B67 if you intend to use any OS routines.

			'''NEW in core 3.0:'''

			When exiting +3 special paging mode, the banks 5 and 2 are mapped back at regular place.

2019-04-19T23:05:31Z

← Older revision		Revision as of 00:05, 20 April 2019
Line 2:		Line 2:
	\|Number=$1FFD		\|Number=$1FFD
	\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.		\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.
	~~\|PortMask=%0001 ---- ---- --0-~~
	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes
	\|Subsystem=Memory map		\|Subsystem=Memory map
			\|PortMask=%0001 ---- ---- --0-
	}}		}}
	Bit mapped to control paging options.		Bit mapped to control paging options.

2019-04-14T10:00:20Z

8 revisions imported

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

2017-08-28T16:48:34Z

← Older revision		Revision as of 17:48, 28 August 2017
Line 2:		Line 2:
	\|Number=$1FFD		\|Number=$1FFD
	\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.		\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.
	\|PortMask=%0001----~~ccc~~---0c		\|PortMask=%0001 ---- ---- --0-
	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes

2017-08-28T15:38:24Z

← Older revision		Revision as of 16:38, 28 August 2017
Line 2:		Line 2:
	\|Number=$1FFD		\|Number=$1FFD
	\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.		\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.
	\|PortMask=%0001----~~---~~---0c		\|PortMask=%0001----ccc---0c
	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes

2017-08-28T15:24:01Z

← Older revision		Revision as of 16:24, 28 August 2017
Line 2:		Line 2:
	\|Number=$1FFD		\|Number=$1FFD
	\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.		\|ShortDesc=Controls ROM paging and special paging options from the +2a/+3.
			\|PortMask=%0001----------0c
	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes