Difference between revisions of "83Plus:Ports:24"
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Thepenguin77 (Talk | contribs) (Created page with '24 - Flash Execution Override 24 - Flash Execution Override [[Category:83Plus:Ports:By_Name|Fl…') |
(Found true purpose of bits 0 and 1) |
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| − | [[Category:83Plus:Ports:By_Address:Protected|24 - Flash Execution | + | [[Category:83Plus:Ports:By_Address:Protected|24 - Flash Execution Limits High Bit]] [[Category:83Plus:Ports:By_Address|24 - Flash Execution Limits High Bit]] [[Category:83Plus:Ports:By_Name|Flash Execution Limit High Bit]] |
{{SE-Only Port|04}} | {{SE-Only Port|04}} | ||
{{Protected Port}} | {{Protected Port}} | ||
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'''Port Number:''' 24h | '''Port Number:''' 24h | ||
| − | '''Function:''' Flash Execution | + | '''Function:''' Flash Execution Limits High Bit |
| − | + | Bit 0 of this port forms the high bit of page number for port 23. Bit 1 of this port forms the high bit of the page number for port 24. Therefore, this port supports 8 MB flash chips. | |
| + | |||
| + | Since no 8 MB flash chip exists, this port in effect overrides [[83Plus:Ports:23|port 23]] and is overridden by port [[83Plus:Ports:22|port 22]]. | ||
=== Write Values === | === Write Values === | ||
| − | * Bit 0: | + | * Bit 0: High bit (bit 8) of port 23 |
| − | * Bit 1: | + | * Bit 1: High bit (bit 8) of port 24 |
* Bits 2-7: Toggleable, but no effect is apparent | * Bits 2-7: Toggleable, but no effect is apparent | ||
=== Read Values === | === Read Values === | ||
| − | * Bit 0 | + | * Bit 0-7: Reads whatever was last written |
| − | + | ||
| − | + | ||
== Comments == | == Comments == | ||
| − | + | Bits 2-7 can be toggled so they may have a use, too. | |
This port does not exist on the standard 83 Plus. See ports [[83Plus:Ports:05|5]] and [[83Plus:Ports:16|16]] instead. | This port does not exist on the standard 83 Plus. See ports [[83Plus:Ports:05|5]] and [[83Plus:Ports:16|16]] instead. | ||
Revision as of 13:20, 20 February 2013
| This port only exists as a distinct port on the TI-83 Plus Silver Edition, the TI-84 Plus, and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 04. |
| This port is protected, which means user programs cannot ordinarily write to it directly. |
Synopsis
Port Number: 24h
Function: Flash Execution Limits High Bit
Bit 0 of this port forms the high bit of page number for port 23. Bit 1 of this port forms the high bit of the page number for port 24. Therefore, this port supports 8 MB flash chips.
Since no 8 MB flash chip exists, this port in effect overrides port 23 and is overridden by port port 22.
Write Values
- Bit 0: High bit (bit 8) of port 23
- Bit 1: High bit (bit 8) of port 24
- Bits 2-7: Toggleable, but no effect is apparent
Read Values
- Bit 0-7: Reads whatever was last written
Comments
Bits 2-7 can be toggled so they may have a use, too.
This port does not exist on the standard 83 Plus. See ports 5 and 16 instead.
