IOXT - Revision history

TArntsen: Added infobox

2013-03-21T08:39:33Z

Added infobox

← Older revision		Revision as of 08:39, 21 March 2013
Line 1:		Line 1:
			{{InstructionBox
			\|Mnemonic=IOXT
			\|Description=Exchange information between<br>I/O system and A register.
			\|Format=IOXT
			\|Code=164 000
			\|Affected=A (''see description'')
			\|Type=''See description''
			\|Architecture=[[ND-100]], [[ND-110 CPU\|ND-110]]
			}}
	'''IOXT''' instruction is used for programmed IO. IOXT is a [[privileged instruction]] in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.		'''IOXT''' instruction is used for programmed IO. IOXT is a [[privileged instruction]] in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.

	[[IOX]] and IOXT are the only instructions used to communicate with external devices.		[[IOX]] and IOXT are the only instructions used to communicate with external devices.

	IOXT transfers data between a device I/O register and the ~~CPU's~~ [[A register]].		IOXT transfers data between a device I/O register and the CPUs [[A register]].

	The [[T register]] is used as IO address. If bit 0 of the T register is zero then IOXT reads the value from the IO register into register A. If bit 0 is one then IOXT writes the contents of register A to the IO register.		The [[T register]] is used as IO address. If bit 0 of the T register is zero then IOXT reads the value from the IO register into register A. If bit 0 is one then IOXT writes the contents of register A to the IO register.

Tingo: added Address range section

2011-12-20T22:44:27Z

added Address range section

@@ Line 14: / Line 14: @@
 This means that all I/O device registers which need to be loaded from the CPU A register are assigned and odd device register address. Similarly I/O device input registers are assigned even addresses.
 == See also ==
 *[[Programmed IO]]

Tingo: /* Se also */ corrected spelling

2011-12-20T22:16:19Z

Se also: corrected spelling

← Older revision		Revision as of 22:16, 20 December 2011
Line 14:		Line 14:
	This means that all I/O device registers which need to be loaded from the CPU A register are assigned and odd device register address. Similarly I/O device input registers are assigned even addresses.		This means that all I/O device registers which need to be loaded from the CPU A register are assigned and odd device register address. Similarly I/O device input registers are assigned even addresses.

	== Se also ==		== See also ==
	*[[Programmed IO]]		*[[Programmed IO]]
	*[[IOX]]		*[[IOX]]

Tingo: added Direction of transfer section

2011-12-20T22:15:03Z

added Direction of transfer section

← Older revision		Revision as of 22:15, 20 December 2011
Line 9:		Line 9:
	Addressing of a non existing device results in a [[IOX error]].		Addressing of a non existing device results in a [[IOX error]].

			== Direction of transfer ==
			The actual transfer direction of the IOX and IOXT instructions is decoded from the device-register address, based on the following convention: the transfer direction is input (from device to CPU) if the device-register address is even.

			This means that all I/O device registers which need to be loaded from the CPU A register are assigned and odd device register address. Similarly I/O device input registers are assigned even addresses.

	== Se also ==		== Se also ==

Tingo: /* References */ added another reference

2011-12-20T22:05:08Z

References: added another reference

← Older revision		Revision as of 22:05, 20 December 2011
Line 16:		Line 16:
	== References ==		== References ==
	*{{ND-doc\|06.015\|(Programmed I/O, chapter 6.3)}}		*{{ND-doc\|06.015\|(Programmed I/O, chapter 6.3)}}
			*{{ND-doc\|06.026.1\| (The Input/Output Instructions IOX and IOXT, page 141)}}

	[[Category:ND-100 instructions]]		[[Category:ND-100 instructions]]

Mike: fixing a typo, added some links

2009-08-04T11:14:27Z

fixing a typo, added some links

← Older revision		Revision as of 11:14, 4 August 2009
Line 1:		Line 1:
	'''IOXT''' instruction is used for programmed IO. IOXT is a privileged instruction in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.		'''IOXT''' instruction is used for programmed IO. IOXT is a [[privileged instruction]] in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.

	[[IOX]] and IOXT are the only instructions used to communicate with external ~~instructions~~.		[[IOX]] and IOXT are the only instructions used to communicate with external devices.

	IOXT transfers data between a device I/O register and the CPU's A register.		IOXT transfers data between a device I/O register and the CPU's [[A register]].

	The T register is used as IO address. If bit 0 of the T register is zero then IOXT reads the value from the IO register into register A. If bit 0 is one then IOXT writes the contents of register A to the IO register.		The [[T register]] is used as IO address. If bit 0 of the T register is zero then IOXT reads the value from the IO register into register A. If bit 0 is one then IOXT writes the contents of register A to the IO register.

	Addressing of a non existing device results in a [[IOX error]].		Addressing of a non existing device results in a [[IOX error]].

Mike: Spelling

2009-02-01T17:06:01Z

Spelling

← Older revision		Revision as of 17:06, 1 February 2009
Line 14:		Line 14:
	*[[IOX]]		*[[IOX]]

	== ~~Referenses~~ ==		== References ==
	*{{ND-doc\|06.015\|(Programmed I/O, chapter 6.3)}}		*{{ND-doc\|06.015\|(Programmed I/O, chapter 6.3)}}


	[[Category:ND-100 instructions]]		[[Category:ND-100 instructions]]

Mike: Clean up + adding category

2009-01-29T10:01:44Z

Clean up + adding category

← Older revision		Revision as of 10:01, 29 January 2009
Line 1:		Line 1:
	'''IOXT''' instruction is used for programmed IO. IOXT is a privileged instruction in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.		'''IOXT''' instruction is used for programmed IO. IOXT is a privileged instruction in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.

	[[IOX]] and IOXT are the only instructions used to communicate with external instructions.		[[IOX]] and IOXT are the only instructions used to communicate with external instructions.

Line 8:		Line 9:
	Addressing of a non existing device results in a [[IOX error]].		Addressing of a non existing device results in a [[IOX error]].

	~~See~~ also [[Programmed IO]] ~~and~~ [[IOX]] ~~instruction<br>~~
	~~Ref~~. Programmed I/O, chapter 6.3 ND-100 ~~Functional Description~~		== Se also ==
			*[[Programmed IO]]
			*[[IOX]]

			== Referenses ==
			*{{ND-doc\|06.015\|(Programmed I/O, chapter 6.3)}}


			[[Category:ND-100 instructions]]

Gandalf: Initial page, copy from Rogers wiki, needs more work

2008-10-21T00:02:50Z

Initial page, copy from Rogers wiki, needs more work

New page

'''IOXT''' instruction is used for programmed IO. IOXT is a privileged instruction in normal cases but if there is no OS running and the paging system is turned off then IOXT is an unprivileged instruction.
[[IOX]] and IOXT are the only instructions used to communicate with external instructions.

IOXT transfers data between a device I/O register and the CPU's A register.

The T register is used as IO address. If bit 0 of the T register is zero then IOXT reads the value from the IO register into register A. If bit 0 is one then IOXT writes the contents of register A to the IO register.

Addressing of a non existing device results in a [[IOX error]].

See also [[Programmed IO]] and [[IOX]] instruction<br>
Ref. Programmed I/O, chapter 6.3 ND-100 Functional Description