Executive ROM - Revision history

Zendocon at 14:08, 30 July 2019

2019-07-30T14:08:40Z

Zendocon at 13:53, 30 July 2019

2019-07-30T13:53:20Z

Mr z: Protected "Executive ROM" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

2010-12-04T08:21:35Z

Protected "Executive ROM" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

Tlindner: Reverted edit of PasdeLlatr, changed back to last version by Mr z

2008-12-19T22:33:44Z

Reverted edit of PasdeLlatr, changed back to last version by Mr z

PasdeLlatr: eltolodarno

2008-12-19T09:35:39Z

eltolodarno

Mr z at 22:47, 23 January 2005

2005-01-23T22:47:21Z

Mr z: /* EXEC ROM chip asserts reset/interrupt addresses during IAB */

2005-01-12T01:39:13Z

‎EXEC ROM chip asserts reset/interrupt addresses during IAB

Pingaso at 22:24, 11 January 2005

2005-01-11T22:24:20Z

Pingaso at 22:02, 11 January 2005

2005-01-11T22:02:44Z

Mr z at 01:44, 11 January 2005

2005-01-11T01:44:36Z

← Older revision		Revision as of 14:08, 30 July 2019
Line 87:		Line 87:
	$1DF8 Divide: Dividend is R1, divisor is R2.		$1DF8 Divide: Dividend is R1, divisor is R2.
	Quotient placed in R0, remainder placed in R1.		Quotient placed in R0, remainder placed in R1.
		+
		+	$1EC4 Razz for R0 ticks.
		+
		+	$1ED5 Cheer for R0 ticks.
		+
		+	$1F1D Whistle for R0 ticks.

@@ Line 7: / Line 7: @@
 ==Known Executive ROM Subroutines==
    $1668  Extend sign from low byte of R0 into full word.
-   $1DDC  Multiply: R0 and R1.  Result in R2.
+   $169E  Generate a random number between 0 and R0.  Result in R0.
    $1738  Zeros memory.
@@ Line 29: / Line 28: @@
           R3 = y.pos
-   $18C5  Write a numeric string, padded with spaces on the left instead of
+   $17C1  Push registers R1 through R4 onto the stack.
    $1867  Same as $187B, except you can specify an address from where to
@@ Line 58: / Line 45: @@
           R3 = attribute word (same as BACKTAB word format)
           R4 = destination address to write to (i.e. BACKTAB location)
    $1B95  Possibly triggers a "stock" sound effect.
@@ Line 69: / Line 80: @@
           to start running the instruction right after a null-terminated word
           of $02CF (??).

← Older revision		Revision as of 22:33, 19 December 2008
Line 1:		Line 1:
−	~~roldardardr~~
	[[Category:Memory Units]]		[[Category:Memory Units]]
	The Executive ROM is 5KB of ROM arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision address range $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF. On the Intellivision I, two chips hold the EXEC ROM: an RO-3-9502 and an RO-3-9504. On the Intellivision II, these two ROMs were combined into a single RO-3-9506.<br/><br/>		The Executive ROM is 5KB of ROM arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision address range $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF. On the Intellivision I, two chips hold the EXEC ROM: an RO-3-9502 and an RO-3-9504. On the Intellivision II, these two ROMs were combined into a single RO-3-9506.<br/><br/>

← Older revision		Revision as of 09:35, 19 December 2008
Line 1:		Line 1:
		+	roldardardr
	[[Category:Memory Units]]		[[Category:Memory Units]]
	The Executive ROM is 5KB of ROM arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision address range $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF. On the Intellivision I, two chips hold the EXEC ROM: an RO-3-9502 and an RO-3-9504. On the Intellivision II, these two ROMs were combined into a single RO-3-9506.<br/><br/>		The Executive ROM is 5KB of ROM arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision address range $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF. On the Intellivision I, two chips hold the EXEC ROM: an RO-3-9502 and an RO-3-9504. On the Intellivision II, these two ROMs were combined into a single RO-3-9506.<br/><br/>

@@ Line 1: / Line 1: @@
 [[Category:Memory Units]]
-The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF.  On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>
+The Executive ROM is 5KB of ROM arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision address range $1000-$1FFF.  On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.  On the Intellivision I, two chips hold the EXEC ROM:  an RO-3-9502 and an RO-3-9504.  On the Intellivision II, these two ROMs were combined into a single RO-3-9506.<br/><br/>
-The Executive ROM is essentially the operating system for the Intellivision.  When the Intellivision is turned on or reset, the [[CP1610]] begins executing instructions from the Executive ROM starting at location $1000.  Additionally, whenever the [[STIC]] generates an interrupt due to vertical blank, the [[CP1610]] jumps to the interrupt-handling subroutine located in the Executive ROM at location $1004.  One of the EXEC's ROM chips is actually responsible for telling the CPU to jump to $1000 or $1004.  It asserts these addresses during the [[Bus Phases|IAB Bus Phase]].<br/><br/>
+The Executive ROM provides the "operating system" for the Intellivision.  When the Intellivision is turned on or reset, the [[CP1610]] begins executing instructions from the Executive ROM starting at location $1000.  Additionally, when the [[STIC]] generates its [[VBlank Interrupt]], the [[CP1610]] jumps to the interrupt-handling subroutine located in the Executive ROM at location $1004.  The RO-3-9502 (or RO-3-9506) chip asserts these addresses to the CPU during the [[Bus Phases|IAB Bus Phase]].  Cartridges can theoretically override these addresses by intercepting the IAB bus phase, asserting the desired address, and remapping IAB to NACT.<br/><br/>
 Cartridge ROM usually originates at address $5000 and, after completing its startup sequence, the Executive ROM jumps to the start of the program contained in the cartridge at that location.  However, prior to entering the startup sequence, the Executive ROM first checks addresses $4800 and $7000 for viable ROM, and if it exists, the Executive ROM skips the normal startup process and begins running the program immediately.  This is why some games start their map at $4800, to nearly completely bypass the Executive ROM start-up sequence.

← Older revision	Revision as of 08:21, 4 December 2010
(No difference)

← Older revision		Revision as of 22:24, 11 January 2005
Line 1:		Line 1:
−	[[Category:~~:Executive ROM~~]]	+	[[Category:Memory Units]]
	The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>		The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>

← Older revision		Revision as of 22:02, 11 January 2005
Line 1:		Line 1:
		+	[[Category::Executive ROM]]
	The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>		The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>

← Older revision		Revision as of 01:44, 11 January 2005
Line 1:		Line 1:
−	The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF. On the Intellivision II, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>	+	The Executive ROM is a 5KB ROM chip arranged as 4096 10-bit values, referred to as "decles", mapped into the Intellivision in 4KB of address space from $1000-$1FFF. On the Intellivision II only, the Executive ROM includes an additional 256 decles at addresses $0400-$04FF.<br/><br/>

	The Executive ROM is essentially the operating system for the Intellivision. When the Intellivision is turned on or reset, the [[CP1610]] begins executing instructions from the Executive ROM starting at location $1000. Additionally, whenever the [[STIC]] generates an interrupt due to vertical blank, the [[CP1610]] jumps to the interrupt-handling subroutine located in the Executive ROM at location $1004.<br/><br/>		The Executive ROM is essentially the operating system for the Intellivision. When the Intellivision is turned on or reset, the [[CP1610]] begins executing instructions from the Executive ROM starting at location $1000. Additionally, whenever the [[STIC]] generates an interrupt due to vertical blank, the [[CP1610]] jumps to the interrupt-handling subroutine located in the Executive ROM at location $1004.<br/><br/>