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Discussion Starter · #1 ·
Hey folks -- I just found a longtime diamond-in-the-rough, a 1977 Computron in great working condition. It's a single-button model, second-generation, with a 229 module. The more-common N6 has the two buttons and there's lots of documentation about them, but I'm having a heck of a time finding any technical documentation on this single-button model.

It is pretty straight-forward to set — hit the button a few times and it enters timekeeping mode. The only thing I can’t figure out is the month — it cycles between 1-12 but there are 5 “stages” — in other words, it’ll go 1-12 with each push and then the number to the right will increase with each cycle of 12 until it hits 5 and then back to 1 — what does this mean? The months on the left will continue to cycle 1 up until 12 and then the number on the right will rise, 1-5, until it hits 5 and resets.

What kind of measurement is "1-5" as it relates to the month?

Thanks!

IMG_09A8F794C50F-1.jpg
 

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Discussion Starter · #3 ·
Thanks for these! Unfortunately, all of this references either the technical manual for the two-button module model (N6) or just some historical information. I’m looking for the setting instructions or technical manuals on this single-button (N7) version to find out what the heck this extra numeral is there for when setting the month!

Appreciate the help!
 

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If it was 1-4 I would think it's asking which year of the leap cycle you're on. 1-5 I have no clue.

I looked through my set of 70s-80s "Technical Letters" but only found instructions for series 228 (the one with one button and one knob that pushes and pulls). It does not know months at all, and you have to correct it on short months.
 

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Discussion Starter · #5 ·
Yeah, I've been trying to figure out what months would be "one out of five" -- If it were 30/31/29/28, that's only four! What's the fifth??? I feel like I'm going crazy.
 

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Discussion Starter · #7 ·
Are you sure yours is not module 254 or 255? 229 had two buttons.
There seems to be some confusion -- Mine is marked with "229" on the back, and is the single-button N7 model -- but yes, the 254/255 had a single button. There's also a chance that the 229 went from two buttons to one when it when from N6-N7, but I don't have confirmation on that.

I can't even find technical or setting instructions for the single-button 254/255 models, but I'm still out of luck.
 

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It would appear from the tech info I listed that the 229 was a 4 digit display and the 254 is a 6 digit display. That is a big difference and would lead you to which one you own.

BULOVA COMPUTRON 229 DRIVERS N6 LED 1976.jpg
 

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Discussion Starter · #9 ·
Thanks!

Pretty obvious based on my pic that this is a six-digit display with a single-button (which was a later design), making it a N7 with a 254?

The big question is still what this 1-5 scale for setting the month is for on it!
 

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This 254 module has a rare (Day of the Week Function). This is from an ebay posting below: Could the 1-5 be part of the Day of the Week function?


As for the one-button operation of the Bulova 254 module, the way it works is, you press the button a few times in rapid succession, and that causes it to go into the setting modes; then, every few seconds, it will switch through all the setting modes, automatically...numeric month, numeric day, day-of-the-week, hours, and minutes. At each step, press the button as needed, to advance any of the functions, and then finally, leave it alone for a couple of seconds, and the watch will exit the setting modes, all by itself...really cool, the way the setting modes work
 

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Discussion Starter · #11 ·
This 254 module has a rare (Day of the Week Function). This is from an ebay posting below: Could the 1-5 be part of the Day of the Week function?

That's a good guess, but then the next screen DOES allow for "Day of the Week" (in two-letter versions), on its own.

So why would the MONTH setting go through FIVE "versions"? Wouldn't it be on a scale of 1-7? Whatever that 1-5 number is, it's connected to the initial month choice.

Is my explanation making any sense? I feel like I'm a crazy person.
 

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Whatever that 1-5 number is, it's connected to the initial month choice.

Is my explanation making any sense? I feel like I'm a crazy person.
Yes, your question makes sense. I think the yellow circled digit is the area in question (1-5)? Correct? Or is it the digit(5) to the left of that that is in question?

IMG_09A8F794C50F-1.jpg
 

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Discussion Starter · #13 ·
Yup! That circled digit - which goes from 1-5 every time the left digit goes past 12 - is the QUESTION! Any clue?
 

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Well, with all my searches of known LED sites, I have no clue what that 1-5 setting deal is. So if it were me I would do 4 things.

1. Hope that someone on this site with that exact watch will see your thread and respond.
2. Visit this all Digital watch forum Newdwf.com Link and ask them. If anybody would know, they would. (FYI: I looked over the 22 pages of threads there and I didn't see anything about a Computron 254 but it wouldn't hurt to ask in a new thread).
3. Contact this seller on ebay Ebay Seller Sold Listings Link and ask him. He sold one in Feb and sells several LED watches so he may be a collector with some knowledge and not a Flipper. He seemed to know the inner workings of the 254 he sold.
4. Since the 1-5 doesn't seem to effect the 12 month calendar, just forget its there and set the watch. If it's truly a big deal with setting the watch, you will find out soon enough. Otherwise, you may never know that weird setting exists and the watch will perform normally.
 

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Could it be the week of the month? There are typically 5 weeks in a month. Just brainstorming. Steve


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I know this is going to be a pain and might cost you a whole set of batteries, but would you try something? Set the watch to mystery# 1, Feb 28 11:58 PM, then mystery# 2, Feb 28 11:58 PM, etc., until mystery# 5, and in each case let it roll over past midnight, and see what date you get after Feb 28?
 

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Discussion Starter · #17 ·
I know this is going to be a pain and might cost you a whole set of batteries, but would you try something? Set the watch to mystery# 1, Feb 28 11:58 PM, then mystery# 2, Feb 28 11:58 PM, etc., until mystery# 5, and in each case let it roll over past midnight, and see what date you get after Feb 28?
I feel like the wear-and-tear-and-battery-usage might be a little extreme for this one, but I see where you're going and I LIKE IT!

It would make sense this would be for leap years, and factor in with the type of piece it is... so far, I think this is the best theory.

Wouldn't you agree it is crazy that this rather advanced and specialized function wouldn't be notated anywhere in documenting this 254 module?!
 

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Discussion Starter · #18 ·
2. Visit this all Digital watch forum Newdwf.com Link and ask them. If anybody would know, they would. (FYI: I looked over the 22 pages of threads there and I didn't see anything about a Computron 254 but it wouldn't hurt to ask in a new thread).
3. Contact this seller on ebay Ebay Seller Sold Listings Link and ask him. He sold one in Feb and sells several LED watches so he may be a collector with some knowledge and not a Flipper. He seemed to know the inner workings of the 254 he sold.
These are great tips -- I'll look up that seller. I did a deep dive into Digital Watch Forum and I opted against starting a thread there because that place feels very dead, especially for these vintage pieces... unless there's someone particular who's active there? Thanks again!
 

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I did a deep dive into Digital Watch Forum and I opted against starting a thread there because that place feels very dead, especially for these vintage pieces... unless there's someone particular who's active there? Thanks again!
I agree that the DWF has slowed alot in the past few years. If there is anybody that visits that forum to read topics, its a person with a Digital watch and that is why I would post your question there if you feel the need to. There may not be alot of chat going on but the Digital watch folks still view it so if a good tech question does come up that can be answered it will be. No guarantees it will get answered but its one option to try. I have belonged to that site for years but haven't posted in a long time. I really don't follow LED watches much anymore even though I own a few examples.

*****If you find the answer, please post it here. It would educate all of us!!!!:thumbup1:
 

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Discussion Starter · #20 ·
Little update -- I tried to join DWF but they have a weird "email us" form that feels very dubious to gain membership. So we'll see.

I emailed that prolific seller of Computron and other "red LED" watches on eBay and she got back to me, but alas, has no idea what this extra digit is for! It's confusing her, too! She said she would dig up some other old-school collectors and ask them, but also suggested the nebulous dead-zone of DWF.
 
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