MORE BLOODY TIMEWARP ISSUES

[ddstoys]

The two 40 pin sockets on the cpu had been replaced before but ill replace them again just to be sure.

  Now the machine has new

Interconnect pins and plugs
all pia sockets replaced
all new pia chips
all new 5101


lets hope the new CPU chips finsihes it off

[Retropin]

Just checked... i have 2 off 6800CPU.
One is a good "pull" and the other is new.

Ill put the new one the post...

... odd thing is, once i stocked up on 6800 and 6812 i havent had to use them!~


Im also pretty sure that one of my local elec stores has 6800 as NOS.. pretty sure thats where i bought them from

[Retropin]

Just checked... 13 left in stock... will go snap em up

[ddstoys]

Just checked... 13 left in stock... will go snap em up

Sweet grab em while you can 

[FirePower]

Yeah Gav it is the 6800 if yu have a spare that would be great

I'm happy for someone to tell me I'm wrong, but I don't think a 6800 will be ok for a sys 6 cpu board?  A 6800 needs an external clock generator, this is more than just the crystal.
You need a 6802 or 6808 and then there are a few jumpers to set depending on which of these you use as one has onboard memory.

Processors do fail, but I wouldn't think it's that frequent - have you stuck a scope or logic probe on a few pins, any of the address lines, the VMA or R/W would be fair ones to examine.
Any sign of activity on these pins would suggest to me the processor is ok and have me looking elsewhere. Do you have the WMS test rom?

[Retropin]

Yeah Gav it is the 6800 if yu have a spare that would be great

I'm happy for someone to tell me I'm wrong, but I don't think a 6800 will be ok for a sys 6 cpu board?  A 6800 needs an external clock generator, this is more than just the crystal.
You need a 6802 or 6808 and then there are a few jumpers to set depending on which of these you use as one has onboard memory.

Processors do fail, but I wouldn't think it's that frequent - have you stuck a scope or logic probe on a few pins, any of the address lines, the VMA or R/W would be fair ones to examine.
Any sign of activity on these pins would suggest to me the processor is ok and have me looking elsewhere. Do you have the WMS test rom?

Youre correct... also has a 6875 as clock chip

[ddstoys]

 This game came running a system 4 board which is why it need the 6800 which suck because i have eaps of spares for my Gorgar whic is running the system 6

[ddstoys]

And im glad you mentioned the test chips i got Skybeaux to burn me a set a few months back and forgot i even had them.    IM GOING FOR A PLAY 

[Skybeaux]

If you haven't done already ,replace the 6875's socket as i've had trouble with these before.
If you've got the original game chips in it i'd get rid of them and put 3 eproms in.
I've had troubles with Williams game chips several times so now they're the first thing i replace to rule them out as a problem.