Difference between revisions of "ZX Interface 1"
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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.
