Difference between revisions of "ZX Interface 1"

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[[category:hardware]]
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The '''ZX Interface 1''' is a communications and storage interface for the ZX Spectrum released by [[Sinclair Research Ltd.|Sinclair Research]].
[[category:peripherals]]
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It provided an RS-232 serial interface, as well as storage using Microdrives and networking capabilities through the [[Sinclair Network]], a proprietary interface of Sinclair's.  The Sinclair Network would later be supported by MGT's [[DISCiPLE]] interface.
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{| class="wikitable" style="text-align: center;"
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|-
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! rowspan="2" colspan="2" style="width: 8em;" | Port
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! colspan="8" | Bit
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|-
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! style="width: 5em;" | 7
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! style="width: 5em;" | 6
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! style="width: 5em;" | 5
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! style="width: 5em;" | 4
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! style="width: 5em;" | 3
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! style="width: 5em;" | 2
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! style="width: 5em;" | 1
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! style="width: 5em;" | 0
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|-
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! style="height: 8em;" rowspan="2" | 0xf7
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! style="height: 4em;" | Read
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| TX Data || || || || || || || Net Input
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|-
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! Write
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| || || || || || || || Net Output / RX Data
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|-
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! style="height: 8em;" rowspan="2" | 0xef
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! style="height: 4em;" | Read
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| || || || Busy || DTR || Gap || Sync || Write Protect
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|-
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! Write
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| || || Wait || CTS || Erase || R/W || Comms Clock || Comms Data
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|-
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! style="height: 8em;" rowspan="2" | 0xe7
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! style="height: 4em;" | Read
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| colspan="8" | Microdrive data read
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|-
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! Write
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| colspan="8" | Microdrive data write
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|-
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|}
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* ''TX Data'' is the value '''received''' by the serial port.
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* ''Net Input'' is the value read from the Sinclair Network port.
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* 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'''.
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* ''DTR'' signals that the remote station wishes to send data, ''CTS'' signals that the Spectrum wishes to send data
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* Wait is used for network synchronisation.
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* When ''Erase'' is '''reset''' the tape is erased and data is written, when '''set''' data is read.
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* ''R/W'' instructs the microdrive to read or write. When ''R/W'' is '''set''' the microdrive runs, when '''reset''' it stops
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* ''Comms Data'' is the value to be shifted into the microdrive select flip-flop chain.
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* ''Comms Clock'' shifts the microdrive select bit along the chain.
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* ''Write Protect'' is raised when a writeable cartridge is present in the selected microdrive.
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* ''Gap'' and ''Sync'' are used to locate the correct block of data on the microdrive.
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== External links ==
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* [[Wikipedia:ZX Interface 1|Wikipedia's article on the ZX Interface 1]]
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[[Category:Peripherals]]

Latest revision as of 21:40, 3 May 2015

The ZX Interface 1 is a communications and storage interface for the ZX Spectrum released by Sinclair Research.

It provided an RS-232 serial interface, as well as storage using Microdrives and networking capabilities through the Sinclair Network, a proprietary interface of Sinclair's. The Sinclair Network would later be supported by MGT's DISCiPLE interface.

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.

External links