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Maplin ROM Box

43 bytes added, 08:55, 30 June 2011
== Technical ==
ROM is selected using an I/O port decoded with A15=1, A13=0. The ROM number is decoded using D3-D0 only, meaning a maximum of 7 16 ROMs can be used, but the PCB only has 8 sockets available.
In addition more then one value can select the same ROM.
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