Scratchpad RAM - Revision history

Mr z: Protected "Scratchpad RAM" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

2010-12-04T09:21:27Z

Protected "Scratchpad RAM" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

Mr z at 22:20, 11 January 2005

2005-01-11T22:20:15Z

Pingaso at 22:11, 11 January 2005

2005-01-11T22:11:03Z

Pingaso at 22:10, 11 January 2005

2005-01-11T22:10:15Z

Mr z at 06:44, 11 January 2005

2005-01-11T06:44:03Z

Pingaso at 18:28, 10 January 2005

2005-01-10T18:28:59Z

New page

An 8-bit RAM unit of 240 bytes mapped into the Intellivision memory map from 100-$1EF. The first 92 bytes are used primarily by the Executive ROM for temporary data storage, but the remaining memory is available for general use by programs.<br/><br/>

$0100-$015C: Used by the Executive ROM for temp data storage.<br/>
$015D-$01EF: Available for general program usage.<br/>

@@ Line 2: / Line 2: @@
 The Scratchpad RAM is a 256 byte RAM mapped at $100 - $1EF.  The last 16 bytes of the Scratchpad cannot be accessed, since the [[PSG]] maps to where those bytes would ordinarily reside.  This memory is 8 bits wide.  The upper 8 bits of each value stored here read as 0.  On writes, the RAM ignores the upper 8 bits of the value written.<br /><br />
-The [[Executive ROM]] stores a number of variables in this memory.  Programs which rely on the EXEC must be careful not to corrupt the EXEC's variables.  Programs that make little or no use of the EXEC's functionality need only take note of the Interrupt Service Vector stored at locations $100-$101.  The table below indicates what's currently know about the EXEC's Scratchpad usage.<br /><br />
+The [[Executive ROM]] stores a number of variables in this memory.  Programs which rely on the EXEC must be careful not to corrupt the EXEC's variables.  Programs that make little or no use of the EXEC's functionality need only take note of the Interrupt Service Vector stored at locations $100-$101.  The table below indicates what's currently known about the EXEC's Scratchpad usage.<br /><br />
 <table border=1>

← Older revision		Revision as of 22:11, 11 January 2005
Line 1:		Line 1:
−	[[Category:Memory Units]	+	[[Category:Memory Units]]
	The Scratchpad RAM is a 256 byte RAM mapped at $100 - $1EF. The last 16 bytes of the Scratchpad cannot be accessed, since the [[PSG]] maps to where those bytes would ordinarily reside. This memory is 8 bits wide. The upper 8 bits of each value stored here read as 0. On writes, the RAM ignores the upper 8 bits of the value written.<br /><br />		The Scratchpad RAM is a 256 byte RAM mapped at $100 - $1EF. The last 16 bytes of the Scratchpad cannot be accessed, since the [[PSG]] maps to where those bytes would ordinarily reside. This memory is 8 bits wide. The upper 8 bits of each value stored here read as 0. On writes, the RAM ignores the upper 8 bits of the value written.<br /><br />

← Older revision		Revision as of 22:10, 11 January 2005
Line 1:		Line 1:
		+	[[Category:Memory Units]
	The Scratchpad RAM is a 256 byte RAM mapped at $100 - $1EF. The last 16 bytes of the Scratchpad cannot be accessed, since the [[PSG]] maps to where those bytes would ordinarily reside. This memory is 8 bits wide. The upper 8 bits of each value stored here read as 0. On writes, the RAM ignores the upper 8 bits of the value written.<br /><br />		The Scratchpad RAM is a 256 byte RAM mapped at $100 - $1EF. The last 16 bytes of the Scratchpad cannot be accessed, since the [[PSG]] maps to where those bytes would ordinarily reside. This memory is 8 bits wide. The upper 8 bits of each value stored here read as 0. On writes, the RAM ignores the upper 8 bits of the value written.<br /><br />

← Older revision	Revision as of 09:21, 4 December 2010
(No difference)

@@ Line 1: / Line 1: @@
-An 8-bit RAM unit of 240 bytes mapped into the Intellivision memory map from 100-$1EF.  The first 92 bytes are used primarily by the Executive ROM for temporary data storage, but the remaining memory is available for general use by programs.<br/><br/>
+The Scratchpad RAM is a 256 byte RAM mapped at $100 - $1EF.  The last 16 bytes of the Scratchpad cannot be accessed, since the [[PSG]] maps to where those bytes would ordinarily reside.  This memory is 8 bits wide.  The upper 8 bits of each value stored here read as 0.  On writes, the RAM ignores the upper 8 bits of the value written.<br /><br />
-$0100-$015C: Used by the Executive ROM for temp data storage.<br/>
+The [[Executive ROM]] stores a number of variables in this memory.  Programs which rely on the EXEC must be careful not to corrupt the EXEC's variables.  Programs that make little or no use of the EXEC's functionality need only take note of the Interrupt Service Vector stored at locations $100-$101.  The table below indicates what's currently know about the EXEC's Scratchpad usage.<br /><br />
-$015D-$01EF: Available for general program usage.<br/>