British Broadcasting Corporation Master Series Microcomputer Service Manual
British Broadcasting Corporation Master Series Microcomputer Service Manual
Part No 0443,004 Issue 1 April 1986
M S S M W BBC B B C .
C A C L 1986 N , , A C L (A C ).
T , . A ( ) A C . H , . A A C T E . A C .
A :- T E A C L N R C CB5 8PD
A A C . A C . T , A C , , , .
T A C .
F 1986 P A C L
1 I 1 M S S M
WARNING: THE COMPUTER MUST BE EARTHED
IMPORTANT: T :
G Y E B N B L
T . T ( ) . D . I , MUST NOT . E , A . I , , 3 ASTA BS1362. I , . T .
A , :
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T N, .
T L, .
2 I 1 Master Series Service Manual
BBC Master Series Microcomputer Service Manual
Contents
1 - I
2 - Packaging and installation 3 - Disassembly and assembly
4 - Selection links
5 - Hardware description 5.1 I 5.2 C 5.3 I I/O 5.4 E I/O 6 - Test equipment 7 - Fault finding 7.1 S 7.2 S RAM 7.3 V 7.4 R 7.5 A 7.6 RS423 7.7 C 7.8 D 7.9 P 7.10 U 7.11 1MH 7.12 T T 7.13 I - 7.14 S 7.15 M 7.16 C 7.17 E
Appendix C P C PCB F EPROM E K
3 I 1 M S S M 1 Introduction T BBC M S M A C L C , E . T A BBC M S M A C L .
4 I 1 M S S M 2 Packaging and installation T - . S W G , , , , , VIEW , V S , . T UK 240V AC 50H . T 13 . I . I .
T .
D , , . D . E .
5 I 1 Master Series Service Manual
3 Disassembly and assembly T BBC M S M , .
To disassemble
T . DO NOT . I - : ( )
T , 2 . U 3 , 1 .
T , .
T - . T . O , (M3 6 ).
T - . T , 4 , 1 - . R .
To reassemble
R ( ) - . M PCB - . R 4 PCB , - .
R , , ( ) - PCB, .
PCB +5V ( ) PCB OV ( ). T -5V ( ).
6 I 1 M S S M R , , PL8 , PL9 . N , . C .
R . R 4 , 3 1 . B ; .
M , .
R , .
7 I 1 M S S M 4 S LK1 PCB , A: 1MH B A I /O 2 . I -A 1MH B . I B 1MH B (M 1 ).
T A . T B . LK2 PCB , : C -5V . O . I , -5V -5V . T R9 LK2 . LK3 : N .
LK4 , : C IRQ. O . T 6818 /RAM . W , CPU IRQ . R LK4 CPU IRQ . T . C . LK5 PCB , E : CSYNC . T . T . I PCB . T .
8 I 1 M S S M LK6(0) LK6(1) , A B: M C S . M - . T 4 : L A B - T 16MH - . T .
L B D - T 16 MH A17 . N MUST . L C D - T 8 MH . T 2 MH ( 2) , . N A B . LK7 PCB , E : V . T . T RGB . I PCB . T W .
LK8 : N . LK9 : N . LK10 NTSC : C S . T . W NTSC VHF , . N UK UHF LK10 .
LK11 : N . LK12 P , B (E ): CSYNC/C M D . T . P A - T CSYNC GENLOCK .
P B - C M S A E . M B , LOW A10 . T E .
9 I 1 M S S M LK13 PCB , W : A D . T . A , PCB A D 1.8V. I LK13 V .
I LK13 LK13 E , PR1 . LK14 PCB , : S . O . A , PCB CHROMA 1.23MH S P . T . LK15 PCB , W : PAL/NTSC . T . A UK, PCB CHROMA PAL . I , NTSC. I , UK PAL . LK16 , : C . O . T . I .
LK17 : N . LK18 , W : P ROM/RAM S . T . W W , 16K RAM " " " " 6 7. W E , 32K ROM 6 7 1C41.
10 I 1 M S S M LK19 , W : P ROM/RAM S . T .
W W , 16K RAM " " " " 4 5. W E , 32K ROM 4 5 IC37.
LK20 : N . LK21 , : L P S .
T , B10 . W , CRTC L P S B10. T GENLOCK LPSTB .
11 I 1 M S S M 5 H 5.1 I
T M S M / . O - .
T C M A / (I/O) 65C12 CPU :-
128 K D R A :- S 64 K . D . 262 K R O M :- S 1/2 M ROM. P 256 K ROM.
I I/O V I/O . T :-
6522 VIA - T :- 1) A 93 2 . 3-C . B R -T C RAM. 2) T P P U P C - T CPU . T I/O . T I/O .
W - , I/O I/O .
12 I 1 M S S M E I/O V :- A 6845 CRT ROB, PAL/NTSC .
A D C :- A A-D 10 5 . T .
T I :- F .
D I :- F S . F FM MFM.
N I :- C ECONET 68B54 . T ( ET ).
1MH B :- T BBC 1MH . E S P :- A . S - . O - .
C P P :- C .
U P :- T / . T .
RS423:- A RS423 . A O :- T . S .
M :- C - . T .
13 I 1 M S S M 5.2 C O RAM ROM M C . T .
M M T 65C12 64K . A 1/2 M ( ), .
T :
F 1
14 I 1 M S S M T , ROM SEL ACC CON FE30 FE34 .
T :- 7 6 5 4 3 2 0 ( FE30) RAM 0 0 0 PM3 PM2 PM1 PM0 ( FE34) IRR TST IFJ ITU Y X E D
T ROMSEL 8000 BFFF.
ACCCON
T ACCCON :
( ) 3000 7FFF ( ) C000 DFFF
128 K RAM T RAM : T , . . T , 16K "S " RAM . T ROM 4,5,6 7. T , ROM " " 32 K . W 64 K , 32K 0000 7FFF CPU , 1.
T 32K , - . T 20 K LYNNE. T ( ) . W D ACCCON , CRT LYNNE. W D , ( ) . W E ACCCON , 3000 7FFF CPU / L 2.
15 I 1 F 2
T CPU , . I , , - . . MOS VDU . A :