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Difference between revisions of "SCI/Specifications/SCI virtual machine/The Sierra PMachine"
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SCI/Specifications/SCI virtual machine/The Sierra PMachine (view source)
Revision as of 14:58, 7 January 2009
, 14:58, 7 January 2009Fixed wiki syntax typos
m (Forgot to remove the "WIP" at the start) |
m (Fixed wiki syntax typos) |
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| Line 377: | Line 377: | ||
;<nowiki>op 0x40: call W relpos, B framesize (4 bytes)</nowiki> | ;<nowiki>op 0x40: call W relpos, B framesize (4 bytes)</nowiki> | ||
;<nowiki>op 0x41: call B relpos, B framesize (3 bytes)</nowiki | ;<nowiki>op 0x41: call B relpos, B framesize (3 bytes)</nowiki> | ||
:Call inside script. | :Call inside script. | ||
:(See description below) | :(See description below) | ||
| Line 561: | Line 561: | ||
;<nowiki>op 0x6e: ipTos W offset (3 bytes)</nowiki> | ;<nowiki>op 0x6e: ipTos W offset (3 bytes)</nowiki> | ||
;< | ;<nowiki>op 0x6f: ipTos B offset (2 bytes)</nowiki> | ||
:Increment Property and push to Stack Same as ipToa, but pushes the result on the stack instead. | :Increment Property and push to Stack Same as ipToa, but pushes the result on the stack instead. | ||
| Line 608: | Line 608: | ||
;<nowiki>op 0x7e</nowiki | ;<nowiki>op 0x7e</nowiki> | ||
;<nowiki>op 0x7f</nowiki> | ;<nowiki>op 0x7f</nowiki> | ||
:These operations don't exist in SCI. | :These operations don't exist in SCI. | ||
| Line 630: | Line 630: | ||
:::0: Accumulator | :::0: Accumulator | ||
:::1: Stack | :::1: Stack | ||
:;Bit 4 | :;Bit 4 | ||
::Whether to use the accumulator as a modifier to the supplied index: | ::Whether to use the accumulator as a modifier to the supplied index: | ||
:::0: Don't use accumulator as an additional index | :::0: Don't use accumulator as an additional index | ||
:::1: Use the accumulator as an additional index | :::1: Use the accumulator as an additional index | ||
:;Bits 5,6 | :;Bits 5,6 | ||
::The type of execution to perform: | ::The type of execution to perform: | ||
| Line 642: | Line 640: | ||
:::2: Increment the variable, then load it into acc or on the stack | :::2: Increment the variable, then load it into acc or on the stack | ||
:::3: Decrement the variable, then load it into acc or on the stack | :::3: Decrement the variable, then load it into acc or on the stack | ||
:;Bit 7 | :;Bit 7 | ||
::Always 1 (identifier for these opcodes) | ::Always 1 (identifier for these opcodes) | ||
::Example: "sagi 2" would Store the Accumulator in the Global variable indexed with 2 plus the current accumulator value (this rarely makes sense, obviously). "+sp 6" would increment the parameter at offset 6 (the third parameter, not counting the argument counter), and push it on the stack. | ::Example: "sagi 2" would Store the Accumulator in the Global variable indexed with 2 plus the current accumulator value (this rarely makes sense, obviously). "+sp 6" would increment the parameter at offset 6 (the third parameter, not counting the argument counter), and push it on the stack. | ||