Difference between revisions of "83Plus:Ports:09"
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=== Read Values === | === Read Values === | ||
| − | * Bit 0: Set if an interrupt was generated by | + | * Bit 0: Set if an interrupt was generated by receiving a byte. |
* Bit 1: Set if an interrupt was generated when a byte can be sent. | * Bit 1: Set if an interrupt was generated when a byte can be sent. | ||
| − | * Bit 2: | + | * Bit 2: Set if an interrupt was generated due to an error in transmission. |
* Bit 3: Set if the assist is currently receiving data | * Bit 3: Set if the assist is currently receiving data | ||
* Bit 4: Set if the assist has read a complete byte (which can be read from [[83Plus:Ports:0A|port 0A]]) | * Bit 4: Set if the assist has read a complete byte (which can be read from [[83Plus:Ports:0A|port 0A]]) | ||
* Bit 5: Set if the assist is ready to write data (via [[83Plus:Ports:0D|port 0D]]) | * Bit 5: Set if the assist is ready to write data (via [[83Plus:Ports:0D|port 0D]]) | ||
* Bit 6: Set if there was an error during transmission | * Bit 6: Set if there was an error during transmission | ||
| − | * Bit 7: | + | * Bit 7: Set if the link assist is currently sending a byte. |
=== Write Values === | === Write Values === | ||
Revision as of 05:05, 21 August 2005
Synopsis
Port Number: 09h
Function: Link Assist Status
This port gives information on the status of the hardware link assist.
Read Values
- Bit 0: Set if an interrupt was generated by receiving a byte.
- Bit 1: Set if an interrupt was generated when a byte can be sent.
- Bit 2: Set if an interrupt was generated due to an error in transmission.
- Bit 3: Set if the assist is currently receiving data
- Bit 4: Set if the assist has read a complete byte (which can be read from port 0A)
- Bit 5: Set if the assist is ready to write data (via port 0D)
- Bit 6: Set if there was an error during transmission
- Bit 7: Set if the link assist is currently sending a byte.
Write Values
None
Comments
This port only exists on the 83+ SE and the 84+.
Credits and Contributions
- Michael Vincent: Original documentation of the link assist
