Spectrum +2

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Contents

Specifications

Memory map

Hardware

ICs and active components

X1 17.734475 MHz Crystal
ICl(ULA) 7C001
IC2 Z80A/u780
IC5 ROM SPECTRUM 128
IC6-IC13, IC15-IC22 4164 150ns
IC27 ZX8401
IC28 74LS04
IC29 HAL10H8CN
IC30 74LS157
IC31 74LS174
IC32 AY-3-8912A
IC33 1488
IC34 1489
IC36 TEA2000
IC37 74LS04
IC38 MC1376
TR3 ZTX313 / KSC839
TR4 ZTX650
TR5 ZTX213
TR6 ZTX313
TR10 BC308B / 8C2I3P/BC558B
TR11-TR13 BC239B / 8C184P/BC549B
TR14 ZTX313
U1 UM1233

|}

pinouts

Power connector

Note the reverse polarity

Barrelconnector.png

Pin Desc
1 0v.
2 +9v 1.3A

TV

RCAPhono.png

Pin Desc
1 Signal ground
2 UHF video signal

RGB/Peritel

DIN8.png

Pin Desc Electrical
1 Composite video 75 ohm, 1.2V
2 Ground 0v
3 Bright TTL
4 Composite Sync TTL
5 Vsync TTL
6 Green TTL
7 Red TTL
8 Blue TTL

Keypad

DBS6312.png

Pin Keypad
1 Ground
2 Input
3 Not used
4 Not used
5 Output
6 +12v

RS232/MIDI

DBS6312.png

Pin RS232 MIDI
1 Ground Return
2 TxD not used
3 RxD Not used
4 DTR Not used
5 CTS Data out
6 +12v not used

Expansion IO

Note, this pinout is for the Grey +2. The Black +2 (+2a) uses a slightly different pinout, the same as the +3

The lack of video signals is the only difference between this pinout and the Spectrum 48K's equivalent.


2x28WayEdgeConnector.png

Pin Top Bottom
1 A15 A14
2 A13 A12
3 D7 +5V
4 n/c +9V
Key
5 D0 0v
6 D1 0v
7 D2 Clk
8 D6 A0
9 D5 A1
10 D3 A2
11 D4 A3
12 /Int /IORQGE
13 /NMI 0V
14 /Halt n/c [1]
15 /MReq n/c [1]
16 /IORQ n/c [1]
17 /RD n/c [1]
18 /WR /BusRQ
19 -5V /Reset
20 /Wait A7
21 +12V A6
22 -12V A5
23 /M1 A4
24 /Rfsh /RomCS
25 A8 /BusAk
26 A10 A9
27 /NC A11
  1. 1.0 1.1 1.2 1.3 In the spectrum 48, these signals are the video component signals, for 128 and +2, they are n/c. Note they are re-used on the +2a and +3

Joystick

The joystick pinout for the Spectrum +2, +2a and +3 is different than the Atari standard, although it shares the same connector.

     1 2 3 4 5
  |-------------|
   \ o o o o o /
    \ o o o o /
     ---------
      6 7 8 9
Pinout
Pin # Joystick
1 N/c
2 common
3 n/c
4 /fire
5 /up
6 /right
7 left
8 common
9 down

Note that all data pins are active low, although lack pull-ups.