ZX Spectrum +2A/2B, +3/3B edge connector: Difference between revisions
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Unlike the +3, the +2A and +2B have no floppy disc controller. Amstrad's original intention was to produce an external floppy controller addon which would have connected to the expansion port on these computers. Since the [[The Amstrad ASIC|ASIC]] is the same on all three machines, all the decoding logic is already present to generate the disk read/write and motor control signals. These three signals are therefore connected through to the expansion port. | Unlike the +3, the +2A and +2B have no floppy disc controller. Amstrad's original intention was to produce an external floppy controller addon which would have connected to the expansion port on these computers. Since the [[The Amstrad ASIC|ASIC]] is the same on all three machines, all the decoding logic is already present to generate the disk read/write and motor control signals. These three signals are therefore connected through to the expansion port. | ||
These signals occupy the pins which were originally used for the component video signals on the [[ZX_Spectrum_16k/48k_Edge_Connector|16k/48k]] expansion port. | These signals occupy the pins which were originally used for the component video signals on the [[ZX_Spectrum_16k/48k_Edge_Connector|16k/48k]] expansion port. | ||
====RESET==== | |||
... This is waiting for some information about the +2B... |