Defender boards

I

invadarr

User
Credits
52CR
Hi All,
I am about to restore and get working an U/R Williams Defender.

I have Two Boardsets for this machine one has red rom labels

and the other has white rom labels. I have a couple of questions I need help for.

(1) what is the difference between them?

(2)are the boards inter changeable for trouble shooting purposes?

(3 The memory/main boards are slightly different in layout and the batteries are in a different

place on the boards. the batteries are corroded and the holders are f***ed would it be ok

to fit modern AA battery holders or is it poss to still get the original ones?

(4}what was the original monitor fitted to this machine it looks original but i would like to confirm this?

Any Help or sugestions would be most welcome and greatly appreciated

Thanks Peter (invadar)
 
andyman

andyman

always pull away from your face
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1,059CR
1. Red roms were the last revision including code for cocktail cab, the white label and green are early revisions, and contain small scoring bugs
2. The boards are interchangeable (there are some config links or 0ohm resistors, check Dave's site above)
3. Again early revision board with single decoder rom, later revision with the two. You can get the originals still but only seen in US, most people fit a single cell CR2023
4. Original monitor would have been either Electrohome G07 or Wells Gardner 4600, if its original it will have a corresponding Williams serial sticker

hth

Andy.
 
C

chadsarcade

Lord of Vectors (tm)
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invadar said:
I have Two Boardsets for this machine one has red rom labels

and the other has white rom labels.
Click to expand...

If they really are white label, get a dump! I suspect they'll be the blue or green set, often marked with a blue or green highlighter across white labels which has faded away over time.

Green (and red) used 11 of the 12 roms, blue only 10 of the 12 (if memory serves!)

invadar said:
(1) what is the difference between them?
Click to expand...

Chronologically, Blue came first, then green, then red.

Red supports cocktail (in conjunction with a 2-decoder CPU board and the appropriate interface board). It also picks up more RAM errors, remembers credits on power off, rug sweeps twice rather than 7 times, has the correct scores on the attract mode for Landers. And likely some other tweaks I've forgotten.

invadar said:
(2)are the boards inter changeable for trouble shooting purposes?
Click to expand...

Yes - any combination should work. You can get it up an running with the CPU and ROM boards only.

invadar said:
(3 The memory/main boards are slightly different in layout and the batteries are in a different

place on the boards. the batteries are corroded and the holders are f***ed would it be ok

to fit modern AA battery holders or is it poss to still get the original ones?
Click to expand...

CR2032 mods are popular, I also did a FRAM hack years back which works like a charm - drops right in place of the 5101 CMOS.

Single decoder boards don't support cocktail mode, and the dual decoders ones do plus have some buffering on the video outputs. They are mostly the same otherwise.

invadar said:
(4}what was the original monitor fitted to this machine it looks original but i would like to confirm this?
Click to expand...

G07s were most prevalent, though I think some used a WG of some description too.

Give me a shout if you need help, I'm based (relatively) along the road from you in Elgin.

Cheers,

Chad

chadsarcade2011-09-10 12:43:15
 
I

invadarr

User
Credits
52CR
Hi All thank you all for your help.
All the labels on the white set appear to be White so Ill dump the roms and find out if it was a blue or green set it has only one decoder prom.

The red set is the newer romset as you sugested

the Monitor is an electrohome GO7.

Thanks again, I hope to start work on the machine next week It's going to take some time lots to do.

Pete

invadar2011-09-09 22:48:38
 
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