BBC Master 128

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Contents

Specifications

Memory map

Hardware

pinouts

UHF

RCAPhono.png

Pin Desc
1 Signal ground
2 UHF video signal

Comp VIdeo

Bnc.png

Pin Desc
1 Signal ground
2 Composite video signal (B&W)

RGB

DIN6.png RGB is a TTL level monitor connection. Can be connected to SCART via some resistors.

Pin Desc Scart connection
1 Red to RED (15) via a 220 ohm Resistor
2 Green to GREEN (11) via a 220 ohm Resistor
3 Blue to BLUE (7) via a 220 ohm Resistor
4 Sync to CSYNC (20) via a 270 ohm resistor
5 0v To all the signal grounds (5,9,13,17,18)
6 5v Directly to SWITCH (8), via a 220ohm resistor to RGB blanking (16)

Analogue

    1 2 3 4 5 6 7 8
 |-------------------|
  \ o o o o o o o o /
   \ o o o o o o o /
    ---------------
     9 10  12  14
         11  13  15
Pin Desc
1 +5v
2 Gnd
3 Gnd
4 Analog in 3
5 Analog Gnd
6 Gnd
7 Analog in 1
8 Analog Gnd
9 Lightpen strobe in
10 Fire 1
11 Vref
12 Analog in 2
13 Fire 0
14 Vref
15 Analog in 0

RS 422

DIN5-center.png

Pin Desc
1 Cts
2 Rts
3 RX
4 TX
5 Gnd

Cassette

Din7.png

Pin Desc
1 Output
2 Gnd
3 Input
4 Output
5 n/c
6 Motor control
7 Motor control

Econet

Din5-nocenter.png

Pin Desc
1 Data (+)
2 Data (-)
3 Gnd
4 Clock(-)
5 Clock (+)

Tube

  1                                     39
+-----------------------------------------+
| o o o o o o o o o o o o o o o o o o o o |
| o o o o o o o o o o o o o o o o o o o o |
+-------------------   -------------------+
  2                                     40
Pin (top) Desc pin (bottom) desc
1 0v 2 R/W
3 0v 4 2Mhz
5 0v 6 /IRQ
7 0v 8 /Tube
9 0v 10 /Rst
11 0v 12 D0
13 0v 14 D1
15 0v 16 D2
17 0v 18 D3
19 0v 20 D4
21 0v 22 D5
23 0v 24 D6
25 0v 26 D7
27 0v 28 A0
29 0v 30 A1
31 +5V 32 A2
33 +5V 34 A3
35 +5V 36 A4
37 +5V 38 A5
39 +5V 40 A6

1Mhz Bus

  1                               33
+-----------------------------------+
| o o o o o o o o o o o o o o o o o |
| o o o o o o o o o o o o o o o o o |
+---------------   -----------------+
  2                               34
Pin (top) Desc pin (bottom) desc
1 0v 2 R/W
3 0v 4 1mhZ
5 0v 6 /NMI
7 0v 8 /IRQ
9 0v 10 /PGFC
11 0v 12 /PGFD
13 0v 14 /Reset
15 0v 16 Audio in
17 0v 18 D0
19 D1 20 D2
21 D3 22 D4
23 D5 24 D6
25 D7 26 0V
27 A0 28 A1
29 A2 30 A3
31 A4 32 A5
33 A6 34 A7

User port

  1                 19
+---------------------+
| o o o o o o o o o o |
| o o o o o o o o o o |
+---------   ---------+
  2                 20
Pin (top) Desc pin (bottom) desc
1 +5V 2 CB1
3 +5V 4 CB2
5 0v 6 PB0
7 0v 8 PB1
9 0v 10 PB2
11 0v 12 PB3
13 0v 14 PB4
15 0v 16 PB5
17 0v 18 PB6
19 0v 20 PB7

Printer

  1                       25
+---------------------------+
| o o o o o o o o o o o o o |
| o o o o o o o o o o o o o |
+------------   ------------+
  2                       26
Pin (top) Desc pin (bottom) desc
1 /Strobe 2 0v
3 PA0 4 0v
5 PA1 6 0v
7 PA2 8 0v
9 PA3 10 0v
11 PA4 12 0v
13 PA5 14 0v
15 PA6 16 0v
17 PA7 18 0v
19 /Ack 20 0v
21 N/C 22 0v
23 N/C 24 0v
25 N/C 26 N/C

Disk drive

  1                               33
+-----------------------------------+
| o o o o o o o o o o o o o o o o o |
| o o o o o o o o o o o o o o o o o |
+------------   --------------------+
  2                               34
Pin (top) Desc pin (bottom) desc
1 0v 2 /Density select
3 0v 4 /Inx 8"
5 0v 6 n/C
7 0v 8 /Index
9 0v 10 /S0
11 0v 12 /S1
13 0v 14 N/C
15 0v 16 /Motor
17 0v 18 /Dir
19 0v 20 /Step
21 0v 22 /Write data
23 0v 24 /Write en
25 0v 26 /track00
27 0v 28 /Write Prot
29 0v 30 /Read data
31 0v 32 /Side
33 0v 34 /Ready

Aux power out

Looking into the socket...

 +-----+
1| o o |4
2| o o |5
3| X o |6
  \___/
Pin Desc
1 0v
2 +5V
3 n/c
4 0v
5 +12V
6 -5V