GETBS (Super FX): Difference between revisions

Latest revision as of 06:08, 29 November 2023


Basic Info
Opcode	Length	ROM Speed	RAM Speed	Cache Speed
3FEF	2 bytes	6 to 10 cycles	6 to 9 cycles	2 to 6 cycle


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

GETBS is a Super FX instruction that loads one byte from the ROM buffer into the low byte of the destination register. Every bit of the high byte of the destination register becomes whatever bit 7 of that loaded byte is.

The reason the cycle times can vary is because of the ROM buffer.

External Links

Official Super Nintendo development manual on GETBS: Page 2-9-55 of Book II
example: page 2-9-56 of Book II, lbid

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-'''GETBS''' is a [[Super FX]] instruction that loads one byte from the ROM buffer.
+{| class="wikitable" style="float:right;clear:right;width:50%"
-{| class="wikitable" style="float:right;clear:right;width:40%"
 !colspan="8"|Basic Info
 |+
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 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="9"|Flags Clobbered
+!colspan="9"|Flags Affected
 |+
 |B
-|ALT1
+|[[ALT1]]
-|ALT2
+|[[ALT2]]
-|O/V
+|[[O/V]]
 |S
-|CY
+|[[CY]]
 |Z
 |+
@@ Line 36: / Line 34: @@
 |.
 |}
+'''GETBS''' is a [[Super FX]] instruction that loads one byte from the [[ROM buffer]] into the low byte of the [[destination register]].  Every bit of the high byte of the destination register becomes whatever bit 7 of that loaded byte is.
+The reason the cycle times can vary is because of the ROM buffer.
 === See Also ===
@@ Line 41: / Line 43: @@
 * [[GETBL]]
 * [[GETBH]]
+=== External Links ===
+* Official Super Nintendo development manual on GETBS: [https://archive.org/details/SNESDevManual/book2/page/n211 Page 2-9-55 of Book II]
+* example: [https://archive.org/details/SNESDevManual/book2/page/n212 page 2-9-56 of Book II], lbid
 [[Category:ASM]]
 [[Category:Super FX]]
 [[Category:Data Transfer Instructions]]
+[[Category:Two-byte Instructions]]