ZX Spectrum +2A/2B, +3/3B edge connector: Difference between revisions

ZX Spectrum +2A/2B, +3/3B edge connector (view source)

12 bytes added , 22 July 2015

m

651

edits

@@ Line 20: / Line 20: @@
 ====Disc Controller Signals====
-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 gate array|gate array]] 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.