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                        SPECCY TECHNICAL INFORMATION

                  This page last updated on 28 August 1999

    [Z80 CPU] [CB ops] [ED ops] [DD/FD ops] [R reg] [Undocumented flags]
                               [Interrupts]
                           [Channels & Streams]
        [Hardware] [Port FE] [The 48K Spectrum] [Contended Memory]
                     [Interface 1] [Port E7] [Port EF]
                                [Joysticks]
          [The 128K/+2 Spectrums] [Memory] [Keypad] [Sound chip]
               [The +2A/+3 Spectrums] [Memory] [Disk drive]

In addition to reading this, if you are interested in lots of technical
information about various aspects of the Spectrum and how to emulate it,
you are strongly advised to read the documentation accompanying Gerton
Lunter's Z80, in particular the techinfo.doc file. Many other emulators
also include useful information in their documentation.

This page is based on Gerton's techinfo.doc, with major contributions from
Marat Fayzullin, Ian Collier, Sean A. Irvine (Channels and Streams), Pera
Putnik (Port #FE and the differences between Issue 2 and 3 Spectrums),
Pedro Gimeno (Contended memory timings & lots more), Jose Luis Sanchez
(+2A/+3 contended memory timings) and Sean Young (Undocumented flags &
more). Others contributing information include Alvin Albrecht, Mac Buster,
Damien Guard, Erik Kunze, Joe Mackay, Malyrules, James McKay, Joseph S.
Myers and Rui Riberio.