34
edits
ZX Interface 1: Difference between revisions
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→Microdrive Edge Connector
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Signals: | Signals: | ||
* D0/D1 - Interleaved data, a byte at a time, from each of the read/write heads in the microdrive. Data rate approximately 80 Kbps per track. | * D0/D1 - Interleaved data, a byte at a time, from each of the read/write heads in the microdrive. Data rate approximately 80 Kbps per track. TTL Level. | ||
* Comms Clock - Drive select clock, identifies which drive to turn on. TTL level. | * Comms Clock - Drive select clock, identifies which drive to turn on. TTL level. | ||
* WR-PROT - A "low" on this indicates a cartridge is write protected. 9 volt = Not protected. | * WR-PROT - A "low" on this indicates a cartridge is write protected. 9 volt = Not protected. | ||
* Comms Data - Drive select is serially clocked through drives. Logic 1 = selected. Line is inverted from register. | * Comms Data - Drive select is serially clocked through drives. Logic 1 = selected. Line is inverted from register. TTL Level. | ||
* 9v - Power supply for drive | * 9v - Power supply for drive. | ||
* ERASE - Open Collector via 270 Ohm resistor, to ERASE head on selected microdrive. | * ERASE - Open Collector via 270 Ohm resistor, to ERASE head on selected microdrive. Typically sits between 10v and 6v (6v=ERASE) when active. | ||
* R/W - Write is active low. Select to read or write data to drive. | * R/W - Write is active low. Select to read or write data to drive. TTL level. | ||
== Microdrive Performance Characteristics == | == Microdrive Performance Characteristics == | ||