ALT3: Difference between revisions

Latest revision as of 00:54, 22 July 2024


Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Implied (type 2)	3F	1 byte	3 cycles	3 cycles	1 cycle


Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
.	1	1	.	.	.	.

ALT3 is a Super FX flag prefix instruction that sets both the ALT1 and ALT2 flags.

Unlike ALT1 and ALT2 however, ALT3 is only an instruction and not also the name of a flag itself.

Syntax

ALT3

The following instructions require ALT3:

ADC #n
BIC #n
CMP R_n
GETBS
ROMB
XOR #n

External Links

Official Nintendo documentation on ALT3: 9.10 on page 2-9-9 of Book II
Table 2-4-2 on page 2-4-4, lbid.
https://en.wikibooks.org/wiki/Super_NES_Programming/Super_FX_tutorial#Instruction_Set_Table

@@ Line 1: / Line 1: @@
-'''ALT3''' is a [[Super FX]] flag prefix instruction that sets both the [[ALT1]] and [[ALT2]] flags.
+{| class="wikitable" style="float:right;clear:right;width:50%"
+!colspan="8"|Basic Info
+|+
+|'''Addressing Mode'''
+|'''Opcode'''
+|'''Length'''
+|'''ROM Speed'''
+|'''RAM Speed'''
+|'''Cache Speed'''
+|+
+|[[Implied]] (type 2)
+|3F
+|1 byte
+|3 cycles
+|3 cycles
+|1 cycle
+|}
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="9"|Flags Clobbered
+!colspan="9"|Flags Affected
 |+
-|B
+|[[B Flag|B]]
-|ALT1
+|[[ALT1]]
-|ALT2
+|[[ALT2]]
-|O/V
+|[[O/V]]
-|S
+|[[Sign Flag|S]]
-|CY
+|[[CY]]
-|Z
+|[[Zero Flag|Z]]
 |+
-|0
+|.
 |1
 |1
@@ Line 20: / Line 36: @@
 |.
 |}
+'''ALT3''' is a [[Super FX]] flag prefix instruction that sets both the [[ALT1]] and [[ALT2]] flags.
+Unlike ALT1 and ALT2 however, ALT3 is only an instruction and not also the name of a flag itself.
+==== Syntax ====
+<pre>
+ALT3
+</pre>
+The following instructions require ALT3:
+* [[ADC (Super FX)|ADC]] #n
+* [[BIC]] #n
+* [[CMP (Super FX)|CMP]] R<sub>n</sub>
+* [[GETBS]]
+* [[ROMB]]
+* [[XOR]] #n
+==== See Also ====
+* [[ALT0]]
+* [[Super_FX_Opcode_Matrices#ALT1_=_1,_ALT2_=_1]]
+=== External Links ===
+* Official Nintendo documentation on ALT3: 9.10 on [https://archive.org/details/SNESDevManual/book2/page/n165 page 2-9-9 of Book II]
+* Table 2-4-2 on [https://archive.org/details/SNESDevManual/book2/page/n110 page 2-4-4], lbid.
+* https://en.wikibooks.org/wiki/Super_NES_Programming/Super_FX_tutorial#Instruction_Set_Table
 [[Category:ASM]]
-[[Category:Flags]]
+[[Category:Super FX]]
-[[Category:Enhancement Chips]]
+[[Category:Flag Prefix Instructions]]
+[[Category:One-byte Instructions]]