BBC FRED Hardware I/O Address Table
                       ===================================

Addr
-------------------------------------------------------------------------------
FC00  +---------------------------------+  +--- PEDL Z80 -------------------+
FC01  | Byte-wide RAM                   |  +--- Second processor -----------+
FC02  | Card Address                    |
FC03  +---------------------------------+
FC04  +--- BeebOPL ---------------------+
FC05  +--- BeebOPL ---------------------+
FC06
FC07
FC08  +---------------------------------+
FC09  | M2000/EMR/EE                    |
FC0A  | MIDI                            |
FC0B  | Interface                       |
FC0C  |                                 |
FC0D  |                                 |
FC0E  |                                 |
FC0F  +---------------------------------+
FC10  +-----------------+---------------+
FC11  | Teletext        | Teletext      |
FC12  | Hardware        | Receiver      |
FC13  |                 +---------------+
FC14  |                 +---------------+
FC15  |                 |               |
FC16  |                 |               |
FC17  |                 | Prestel       |
FC18  |                 | Hardware      |
FC19  |                 |               |
FC1A  |                 |               |
FC1B  |                 +---------------+
FC1C  |                 +---------------+
FC1D  |                 | Teletext      |
FC1E  |                 | Display       |
FC1F  +-----------------+---------------+

FC20  +---------------------------------+  +--------------------------------+
FC21  | SID Interface                   |  | IEEE Interface                 |
FC22  | (6581 Sound Interface Device)   |  | (TMS 9914A)                    |
FC23  |                                 |  |                                |
FC24  |                                 |  |                                |
FC25  |                                 |  |                                |
FC26  |                                 |  |                                |
FC27  |                                 |  +--------------------------------+
FC28  |                                 |  +--------------------------------+
FC29  |                                 |  | Electron                       |
FC2A  |                                 |  | Econet                         |
FC2B  |                                 |  |                                |
FC2C  |                                 |  |                                |
FC2D  |                                 |  |                                |
FC2E  |                                 |  |                                |
FC2F  |                                 |  +--------------------------------+
FC30  |                                 |  +--------------+ +---------------+
FC31  |                                 |  | Cambridge    | | Electron WiFi |
FC32  |                                 |  | Ring         | |               |
FC33  |                                 |  | Interface    | |               |
FC34  |                                 |  |              | |               |
FC35  |                                 |  |              | |               |
FC36  |                                 |  |              | |               |
FC37  |                                 |  |              | |               |
FC38  |                                 |  |              | |               |
FC39  |                                 |  |              | |               |
FC3A  |                                 |  |              | |               |
FC3B  |                                 |  |              | |               |
FC3C  |                                 |  |              | |               |
FC3D  |                                 |  |              | |               |
FC3E  |                                 |  |              | |               |
FC3F  +---------------------------------+  +--------------+ +---------------+

FC40  +---------------------------------+
FC41  |        Hard Drive Access        |
FC42  |     SCSI      |      IDE        |
FC43  |- - - - - - - -+                 |
FC44  |                                 |
FC45  |                                 |
FC46  |  reflections                    |
FC47  |                                 |
FC48  |                                 |
FC49  |                                 |
FC4A  |                                 |
FC4B  |                                 |
FC4C  |                                 |
FC4D  |                                 |
FC4E  |                                 |
FC4F  +---------------------------------+
FC50  +--- BeebEm ----------------------+
FC51  +--- Clipboard -------------------+
FC52
FC53
FC54
FC55
FC56
FC57
FC58
FC59
FC5A
FC5B
FC5C
FC5D
FC5E
FC5F

FC60  +---------------------------------+  +--------------------------------+
FC61  | Electron Serial port            |  | External Serial ports          |
FC62  | 2681 ACIA                       |  | 6850 ACIAs                     |
FC63  |                                 |  |                                |
FC64  |                                 |  |- - - - - - - - - - - - - - - - |
FC65  |                                 |  |                                |
FC66  |                                 |  |                                |
FC67  |                                 |  |                                |
FC68  |                                 |  |- - - - - - - - - - - - - - - - |
FC69  |                                 |  |                                |
FC6A  |                                 |  |                                |
FC6B  |                                 |  |                                |
FC6C  |                                 |  |- - - - - - - - - - - - - - - - |
FC6D  |                                 |  |                                |
FC6E  |                                 |  |                                |
FC6F  +---------------------------------+  +--------------------------------+
FC70  +---------------------------------+
FC71  | Electron Plus1 expansion        |
FC72  |                                 |
FC73  +---------------------------------+
FC74
FC75
FC76
FC77
FC78
FC79
FC7A
FC7B
FC7C
FC7D
FC7E
FC7F  +=== Electron shadow RAM ========+

FC80  +---------------------+
FC81  | LCD Display Control |
FC82  |                     |
FC83  |                     |
FC84  |                     |  +--- Electron ----------+
FC85  |                     |  +--- external sound ----+
FC86  |                     |
FC87  +---------------------+
FC88
FC89
FC8A
FC8B
FC8C
FC8D
FC8E
FC8F
FC90  +---------------+ +---------------+
FC91  | Electron      | | CTS           |
FC92  | sound         | | Recognition   |
FC93  | and           | | Plus 6522 VIA |
FC94  | speech        | |               |
FC95  |               | |               |
FC96  |               | |               |
FC97  |               | |               |
FC98  |               | |               |
FC99  |               | |               |
FC9A  |               | |               |
FC9B  |               | |               |
FC9C  |               | |               |
FC9D  |               | |               |
FC9E  |               | |               |
FC9F  +---------------+ +---------------+

FCA0                    +---------------+
FCA1                    | CTS           |
FCA2                    | Recognition   |
FCA3                    | Plus palette  |
FCA4                    | registers     |
FCA5                    |               |
FCA6                    |               |
FCA7                    |               |
FCA8                    |               |
FCA9                    |               |
FCAA                    |               |
FCAB                    |               |
FCAC                    |               |
FCAD                    |               |
FCAE                    |               |
FCAF                    |               |
FCB0  +---------------+ |               |  +--------------------------------+
FCB1  | PRISMA        | |               |  | Electron VIA expansion         |
FCB2  | video         | |               |  | 6522 VIA                       |
FCB3  | system        | |               |  |                                |
FCB4  |               | |               |  |                                |
FCB5  |               | |               |  |                                |
FCB6  |               | |               |  |                                |
FCB7  |               | +---------------+  |                                |
FCB8  |               |                    |                                |
FCB9  |               |                    |                                |
FCBA  |               |                    |                                |
FCBB  |               |                    |                                |
FCBC  |               |                    |                                |
FCBD  |               |                    |                                |
FCBE  |               |                    |                                |
FCBF  +---------------+                    +--------------------------------+

FCC0  +---------------+ +---------------+  +=== Electron digital joystick ==+
FCC1  | Electron      | | Watford EPROM |
FCC2  | 1770          | | programmer    |
FCC3  | floppy        | +---------------+
FCC4  | disk          |
FCC5  | expansion     |
FCC6  | controller    |
FCC7  +---------------+
FCC8
FCC9
FCCA
FCCB
FCCC  +---------------------------------+
FCCD  | Morley Electronics RAMdisc      |
FCCE  | control registers               |
FCCF  +---------------------------------+
FCD0                                       +=== Electron digital joystick ==+
FCD0
FCD1
FCD2
FCD3
FCD4
FCD5
FCD6  | I2C Control                     |
FCD7
FCD8  +---------------------------------+
FCD9  | PRES Advanced                   |
FCDA  | Battery-Backed RAM              |
FCDB  | control                         |
FCDC  |                                 |
FCDE  |                                 |
FCDF  +---------------------------------+

FCE0  +---------------------------------+  +=== Electron digital joystick ==+
FCE1  | Electron                        |
FCE2  | Tube                            |
FCE3  | control                         |
FCE4  |                                 |
FCE5  |                                 |
FCE6  |                                 |
FCE7  |                                 |
FCE8  |                                 |
FCE9  |                                 |
FCEA  |                                 |
FCEB  |                                 |
FCEC  |                                 |
FCED  |                                 |
FCEE  |                                 |
FCEF  +---------------------------------+
FCF0  +---------------------------------+  +=== Electron digital joystick ==+
FCF1  | JGH/ETI/EE/EMR                  |
FCF2  |                                 |
FCF3  | MIDI                            |
FCF4  |                                 |
FCF5  | Interface                       |
FCF6  |                                 |
FCF7  +---------------------------------+
FCF8  +--- USB -------------------------+
FCF9  +--- Port ------------------------+
FCFA                                       +--------------------------------+
FCFB                                       | Non-volatile RAM control       |
FCFC  +---------------+ +---------------+  +--------------------------------+
FCFD  | Page-Wide     | | Electron AQR  |
FCFE  | Expansion RAM | +---------------+
FCFF  +---------------+