Spectravideo SVI 318 Service – Technical Manual page 16

DIAGNOSTIC TEST AND TROUBLE SHOOTING CHART
3.
A cartridge is available to test
CPU and OUTPUT BUFFERS to the
1.
USER RAM
2.
3 .
VIDEO RAM (VRAM)
4 . P ROGRAMMABLE SOUND GENERATOR (PSG)
5 .
SOUND CHANNEL
VDP INTERRUPT
6 .
7.
CAS SETTE LINE (CASW/CASR,
8. KEYBOARD LI
9 . JOYSTICK 1 AND
1. To use the testing programme,
cartridge into the GAME CARTRIDGE SOCKET,
interface into the socket,
The programme wi ll pri nt the
**
If t he printer falls to print
occur in any one of the fo llowings:
i)
CPU
ii ) OUTPUT BUFFERS
i li )
USER RAM
I f no errors occur in
2.
RAM OK' i s
RAM ERROR' is printed and the
ADDRESS:
DATA WRITE:
DATA READ:
Test pattern set written to the memory is
3. If no errors are fo und in the
OK'
is printed.
ERROR' is printed, and the following information will be given:
ME/RE)
�
E (OUTPUT/INPUT)
2
SVI-318 COMPUTER TESTING RESULT **
t he t e s t ing o f
printed. However,
XXXX
YY
ZZ
However, if an error does occur,
3 . 1
the SVI-318/SVI-328
EXPANDER
sure t
h
be e powe r
then the ke yboard a
and switch on.
below me s sa get
e
t
h me s sa g e, it indicates that errors
h
t e
USER
an
if error does occur, the message 'USER
following
information will be given:
add re s s of the memory location at which
e r ro r i s
an fo und.
data written to addressed location.
data read from the addressed location.
,
OO
t e stin g of the VRAM, the message 'VRAM
computer hardware:
is off, plug the
nd the cassette
RAM, the message 'USER
,
l
O 0 FC,FD,FE.
2 ,
• • . • •
the message
may
'VRAM