ZX Interface 1: Difference between revisions
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[[category:hardware]] | [[category:hardware]] | ||
[[category:peripherals]] | [[category:peripherals]] | ||
{| class="wikitable" style="text-align: center;" | |||
|- | |||
! rowspan="2" colspan="2" style="width: 8em;" | Port | |||
! colspan="8" | Bit | |||
|- | |||
! style="width: 5em;" | 7 | |||
! style="width: 5em;" | 6 | |||
! style="width: 5em;" | 5 | |||
! style="width: 5em;" | 4 | |||
! style="width: 5em;" | 3 | |||
! style="width: 5em;" | 2 | |||
! style="width: 5em;" | 1 | |||
! style="width: 5em;" | 0 | |||
|- | |||
! style="height: 8em;" rowspan="2" | 0xf7 | |||
! style="height: 4em;" | Read | |||
| TX Data || || || || || || || Net Input | |||
|- | |||
! Write | |||
| || || || || || || || Net Output / RX Data | |||
|- | |||
! style="height: 8em;" rowspan="2" | 0xef | |||
! style="height: 4em;" | Read | |||
| || || || Busy || DTR || Gap || Sync || Write Protect | |||
|- | |||
! Write | |||
| || || Wait || CTS || Erase || R/W || Comms Clock || Comms Data | |||
|- | |||
! style="height: 8em;" rowspan="2" | 0xe7 | |||
! style="height: 4em;" | Read | |||
| colspan="8" | Microdrive data read | |||
|- | |||
! Write | |||
| colspan="8" | Microdrive data write | |||
|- | |||
|} | |||
* TX Data is the value '''received''' by the serial port. | |||
* Net Input is the value read from the Sinclair Network port. | |||
* Bit 0 of port 0x7f is output to the serial port if ''Comms Data'' is '''set''', or to the network port if ''Comms Data'' is '''reset'''. | |||
* DTR signals that the remote station wishes to send data, CTS signals that the Spectrum wishes to send data | |||
* Wait is used for network synchronisation. | |||
* When Erase is '''reset''' the tape is erased and data is written, when '''set''' data is read. | |||
* R/W instructs the microdrive to read or write. When R/W is '''set''' the microdrive runs, when '''reset''' it stops | |||
* Comms Data is the value to be shifted into the microdrive select flip-flop chain. | |||
* Comms Clock shifts the microdrive select bit along the chain. | |||
* Write Protect is raised when a writeable cartridge is present in the selected microdrive. | |||
* Gap and Sync are used to locate the correct block of data on the microdrive. |
Revision as of 23:44, 25 November 2012
Port | Bit | ||||||||
---|---|---|---|---|---|---|---|---|---|
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
0xf7 | Read | TX Data | Net Input | ||||||
Write | Net Output / RX Data | ||||||||
0xef | Read | Busy | DTR | Gap | Sync | Write Protect | |||
Write | Wait | CTS | Erase | R/W | Comms Clock | Comms Data | |||
0xe7 | Read | Microdrive data read | |||||||
Write | Microdrive data write |
- TX Data is the value received by the serial port.
- Net Input is the value read from the Sinclair Network port.
- Bit 0 of port 0x7f is output to the serial port if Comms Data is set, or to the network port if Comms Data is reset.
- DTR signals that the remote station wishes to send data, CTS signals that the Spectrum wishes to send data
- Wait is used for network synchronisation.
- When Erase is reset the tape is erased and data is written, when set data is read.
- R/W instructs the microdrive to read or write. When R/W is set the microdrive runs, when reset it stops
- Comms Data is the value to be shifted into the microdrive select flip-flop chain.
- Comms Clock shifts the microdrive select bit along the chain.
- Write Protect is raised when a writeable cartridge is present in the selected microdrive.
- Gap and Sync are used to locate the correct block of data on the microdrive.