Wait, how come your DA-300 is blue? All mine are white!
(Topic ID: 153216)
Linked Games
Flight 2000
Stern Electronics, 1980
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1 month later
I may have a couple for you, @shimoda, maybe in Feb/March, if you cna wait that long. (I'm making a PCB of my own to replace my stern DA-300 boards to enable the comma *properly* (read: proper number format, not what Bally does in theirs..) in a Babcock glass. Once I get my boards made and glasses transferred over, I'll have four of them I won't need.
Quoted from acebathound:What's the proper number format? Do tell!
As far as the US goes (maybe elsewhere? I dunno..), it's "100" then "1000" then "10,000". The first comma doesn't show up until you hit 5 digits. Bally's displays have it "1,000" and for some reason my OCD hates that. I figure that with an extra latch and logic, can hold the bit (checking C & E segments on the 5th digit like the Bally display) and then activate comma next time the 4th digit is on if needed.
Plus, gives me experience making PCBs. 
Edit: Interesting. back when i was in school (late-80's, early-90's) that was the general rule. Now, it looks as though it should have commas for 4 digits and up. Wow, I must be getting old.
Quoted from gianfri:I was reading your idea and I think is going to be a bit difficult...
I explain why I think like that.
I'm already activating the comma on my displays using the C&E segments, the problem is that the digits are multiplexed and at the moment you get the C&E segments activated on digit 5 you are not powering digit 4 therefore even trying to connect the logic output from the compination of C&E to the comma of digit 4 you'll not light it up.
The only option I see it the have a memory status which stores the C&E condition while powering digit 5 and gives it the result to the comma pin only when this memory circuit gets the power signal from digit 4... funny for a personal project but is this effort worth the result?
Let me know if I'm mistaken
Addendum:
I was thinking while brushing my tooth and an easy solution would be to have an external led for the comma which would be powered by the common anode or catode of digit 5 but would be installed between digit 3 and 4
Acceptable solution?
I'm learning circuit design, so comments are welcome!
I was going to use a latch chip (similar to.. a 74HC373). The comma enable would be one input, latch enable would go high on digit #5, capturing the status of the comma (on/off). Output Enable would be tied through an inverter to digit #4. So, when digit #4 is getting driven, it would enable the output that was latched when #5 was being driven to determine comma status.
Again, however, I'm not a circuit designer, so.. I could be horribly wrong.
Quoted from shimoda:I probably will still need them by then I'm sure
Hell, if my board works, and you really need some, let me know. I can probably get a few more boards made.
1 month later
Quoted from emsrph:Yeah, who would have thunk it?
Put them up on eBay this morning for a little bit more to cover fees. Haven't sold on there for awhile. Can't believe it's up to 10% plus add on PayPal also. Sheesh.
Is it just the glasses, or the complete display? I need some glasses.
2 months later
Quoted from acebathound:How about Stern games? Oliver's page mentions a divide by 10 for METEOR. Same 4555 setup for that?
Just trying to get an idea of things here..
There is a 7-digit ROM for Meteor, and a few folks are working on a (better) 7-digit ROM for the game, and a couple other Sterns as well.
Quoted from shimoda:any chance roms for Nine Ball are part of that (not 7 digit, just maybe better code for the switches...)
I haven't heard anything, since I don't have one of those games. But, I wouldn't be surprised if there's a couple working on stuff..
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