Difference between revisions of "83Plus:Ports:16"
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| − | + | [[Category:83Plus:Ports:By_Address|16 - Flash Sector Exclusion]] | |
| − | + | [[Category:83Plus:Ports:By_Name|Flash Sector Exclusion]] | |
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== Synopsis == | == Synopsis == | ||
| − | '''Port Number:''' | + | '''Port Number:''' 16h |
| − | '''Function:''' Flash | + | '''Function:''' Flash Sector Exclusion |
| − | This port controls | + | This port controls which sectors of Flash may contain executable code. |
=== Read Values === | === Read Values === | ||
| − | * [ | + | * Nothing useful (mirror of [[83Plus:Ports:14]], I think.) |
=== Write Values === | === Write Values === | ||
| − | * | + | * Bit 0: Set if execution is not allowed in sector SA2 (pages 08-0B.) |
| − | + | * Bit 1: Set if execution is not allowed in sector SA3 (pages 0C-0F.) | |
| − | '' | + | * Bit 2: Set if execution is not allowed in sector SA4 (pages 10-13.) |
| + | * Bit 3: Set if execution is not allowed in sector SA5 (pages 14-17.) | ||
| + | * Bit 4: ''Unknown.'' | ||
| + | * Bit 5: ''Unknown.'' | ||
| + | * Bit 6: ''Unknown.'' | ||
| + | * Bit 7: ''Unknown.'' | ||
== Comments == | == Comments == | ||
| − | The | + | The above only applies to the 83+ basic; the port's function on the SE and 84+ is not known. |
| − | + | This port is protected, just as [[83Plus:Ports:14]] is; it is the only other protected port in the original hardware. | |
| − | + | ||
| − | + | It is used, as are ports [[83Plus:Ports:22]] and [[83Plus:Ports:23]] on the SE, to prevent code in the archive from executing, thus theoretically limiting Flash execution privileges to FlashApps. | |
| − | + | ||
Revision as of 16:02, 28 March 2005
Synopsis
Port Number: 16h
Function: Flash Sector Exclusion
This port controls which sectors of Flash may contain executable code.
Read Values
- Nothing useful (mirror of 83Plus:Ports:14, I think.)
Write Values
- Bit 0: Set if execution is not allowed in sector SA2 (pages 08-0B.)
- Bit 1: Set if execution is not allowed in sector SA3 (pages 0C-0F.)
- Bit 2: Set if execution is not allowed in sector SA4 (pages 10-13.)
- Bit 3: Set if execution is not allowed in sector SA5 (pages 14-17.)
- Bit 4: Unknown.
- Bit 5: Unknown.
- Bit 6: Unknown.
- Bit 7: Unknown.
Comments
The above only applies to the 83+ basic; the port's function on the SE and 84+ is not known.
This port is protected, just as 83Plus:Ports:14 is; it is the only other protected port in the original hardware.
It is used, as are ports 83Plus:Ports:22 and 83Plus:Ports:23 on the SE, to prevent code in the archive from executing, thus theoretically limiting Flash execution privileges to FlashApps.
