SMS (Super FX): Difference between revisions

Latest revision as of 05:45, 16 July 2024


Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Implied Indirect	3EAnkk	3 bytes	9 to 14 cycles	13 to 17 cycles	3 to 8 cycles


Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
0	0	0	.	.	.	.

SMS (Store to raM Short address) is a Super FX instruction that stores a value to the Game Pak. The bank must be specified with RAMB.

The selectable RAM address must be an even number between 0 and 510.

The number of cycles varies because of the RAM buffer.

The ALT0 state is restored.

SMS (yy), Rn

Let:

R₁₁ = abcdh
RAMBR = 71h

After executing this program:

 Syntax              Opcode
 SMS (194h), R11     3e ab ca

We have:

(71:0194h) = cdh
(71:0195h) = abh

@@ Line 9: / Line 9: @@
 |'''Cache Speed'''
 |+
-|
+|[[Implied Indirect]]
 |3EAnkk
 |3 bytes
@@ Line 26: / Line 26: @@
 |[[Sign Flag|S]]
 |[[CY]]
-|Z
+|[[Zero Flag|Z]]
 |+
 |0
@@ Line 37: / Line 37: @@
 |}
-'''SMS''' is a [[Super FX]] instruction that stores a value to the [[Game Pak]].
+'''SMS''' (Store to raM Short address) is a [[Super FX]] instruction that stores a value to the [[Game Pak]].  The bank must be specified with [[RAMB]].
 The selectable RAM address must be an even number between 0 and 510.
 The number of cycles varies because of the [[RAM buffer]].
+The [[ALT0]] state is restored.
 ==== Syntax ====
@@ Line 47: / Line 49: @@
 SMS (yy), Rn
 </pre>
+==== Example ====
+Let:
+ R<sub>11</sub> = abcdh
+ RAMBR = 71h
+After executing this program:
+<pre>
+ Syntax              Opcode
+ SMS (194h), R11     3e ab ca
+</pre>
+We have:
+ (71:0194h) = cdh
+ (71:0195h) = abh
 === See Also ===
 * [[SM]]
-* [[RAMB]]
 * [[ALT2]]
+* [[LMS]]
+* [[LM]]
 === External Links ===