Svi 738 won't start in basic

By Hakkeri

Supporter (2)

Hakkeri's picture

10-12-2007, 18:43

Can anyone help me ?

My spectravideo 738 won't start in basic, it only flashes Microsoft basic 1,0 in loop.

When i insert an modul in it, it will start in a game and works fine.

I can't play any disk games or cassette games.

Thanks, for any help !

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By PingPong

Prophet (3557)

PingPong's picture

10-12-2007, 18:58

something is causing the z80 to fetch a machine code jump instruction to 0. May be the rom damaged?

By HansO

Paladin (672)

HansO's picture

10-12-2007, 19:54

RAM most likely. Or in SVI.738 one of the ULA's managing the thing.

Open it up and see if any pf the IC's is in a IC socket. Then wiggle that a little to let the pins make better contact.
And check if this is a modified SVI.738, it is a perfect machine to experiment with! Maybe one pf the experimental wires is loose.

If that does not help, check the service manual.

By Xan0ri

Master (168)

Xan0ri's picture

10-12-2007, 20:14


I can't help you with the issue that much because I'm not that skilled on MSX technics, but I think I can help you if you should need any IC's or other SVI738 parts. I have at least one SVI738 for spare parts at the moment. And also I'm from finland so the exchange of the parts would be easy.
I'd also vote for the bad contact of a certain IC.
From HansO's pages you can find scans of the mainboard, so you can locate RAM chips and ROM's for check. Smile

By Jipe

Paragon (1404)

Jipe's picture

10-12-2007, 20:46

open your MSX and check it
if exist a additionnal RTC board with a Battery desold it and retry start
if your MSX work Battery is dead

By Hakkeri

Supporter (2)

Hakkeri's picture

20-12-2007, 19:46

Thanx to everyone for your replies.

There's no battery in my Msx motherboard. Only empty place for it.
I have tried to check ic sockets with no help.
Maybe the rom is really damaged.
I'll have to check service manual Smile


Enlighted (5614)

NYYRIKKI's picture

21-12-2007, 13:45

I also don't believe the problem is in ROM... If you live somewhere near Helsinki I can try to check it out if you drop the machine for me for a while.

By msx fan finland

Champion (490)

msx fan finland's picture

27-05-2016, 11:26

Same here. My 738 xpress wont start at all.
Only power light comes but no boot from fdd.
There is no picture comes at screen. Only black.
I know that i need to change L1 coil.
When its done i will post here if my 738 start or not.

By mtn

Champion (262)

mtn's picture

27-05-2016, 11:30

Does the "click" come when you turn it on? (cas relay)