Skip navigation
Welcome, Guest! Please Login or Join
Loading...

Finding the oldest Sega Genesis

Oct 31, 2018 at 7:59:36 AM
sean42 (0)
avatar
(----FATHER TIME----- VIDEO GAMES IN 1972) < Tom-Tom >
Posts: 97 - Joined: 03/08/2013
United States
Profile
Well I found Something interesting on my two machines and wonder if some one had my oldest machine repaired at one time.

On my newest machine here are the chip dates
Serial number 39S93002
Anyways what I have found out about mine is that it is a Version VA2

on the 68000 CPU chip it has a date code of 8837 which is 1988 in the 37 week
also on the Z80 chip co processor chip the date code was 8922 Which dates the chip to 1989 in the 22nd week

My oldest Machine
Serial number 39W25227

It turns out to be a VA3
with the 68000 CPU chip with a date code of 8935 which is 1989 in the 35th week
Then on the Z80 chip CO processor chip date was 8942 which is 1989 in the 42nd week.

This is a newer board than what in my higher Serial number.
Which leads me to believe the machine was repaired at one time or the board was swapped out.

Anyway you look at it this does not make much since to have a newer board in a lower serial
number machine.
The version is also higher and the older machine would have the older version boards in them

Here is a helpful link to Variations of boards and systems. This may be some help to someone.
I found this link, so these are not my  oppinions. There is some very good technical data shown at this link
on the Variations of boards.
http://www.sega-16.com/forum/show...

Important read my next post it clears up the mother board issues.


 


Edited: 11/01/2018 at 02:30 PM by sean42

Nov 1, 2018 at 1:23:20 PM
sean42 (0)
avatar
(----FATHER TIME----- VIDEO GAMES IN 1972) < Tom-Tom >
Posts: 97 - Joined: 03/08/2013
United States
Profile
Hi Everyone with some very close looking since the letter in the serial number is the production run this has shown a pattern
for what mother board could be possibly be in your unit.

Here are some examples.
Sean42         Serial number 39W25227 Mother board type VA3
KThrower       Serial number 39V50234 Mother board type VA3
thegirlg33K     Serial number 39W83487 Mother board type VA3

If I had to take a guess you would probably find a VA3 mother board in
Totally terrific Pant unit with the serial number 39V02139
Seem like runs V and W in 1989 had VA3 boards in them and the S and T runs had VA2 mother boards in them.
This is in 1989 units.

Anyways this is what I have observed since all the serial numbers have been coming in.
The list will show this as well. On Units in 1989 with the serial number with the letter U in it we have had no one
let us know what version is printed on their mother boards. So at this point serial numbers with the letter U
could be a VA2 or VA3 mother board. IF your serial number start with a 39U please let us know your version of
mother board.

What the list does show that all 39S or 39T serial numbers have in common is they have the VA2 mother boards.
I also going to say the 39S serial numbers are going to contain the oldest mother boards then follow by the 39 T serial numbers.
Just remember what I mean is that they will have the earliest date codes on the chips on the mother boards.
The 39V and 39W will still have date codes of 1989 in them.
Unless you have a 1988 Japan Made unit. Which have the VA0 and VA1 Mother boards.

I will use my two units as the example to show what I am talking about. I am going to try and make this simple.
We are looking at the CPU chip and Math co processor chip date codes.

First we will look at the serial number 39S93002 which has the VA 2 mother Board.

The 68000 CPU has a date code on it of 8837  . This breaks down to 1988 in the 37 week this chip was made.
The Z80 math co processor chip has a date code of 8922. This breaks down to 1989 in the 22nd week this chip was made.

Now lets look at serial number 39W25227 which has VA 3 mother board in it

The 68000 CPU chip has a date code on it of 8935. This breaks down to 1989 in the 35th week this chip was made.
The Z80 math co processor chip has a date code of 8942. This breaks down to 1989 in the 42nd week this chip was made.

With this you can see both serial numbers show the units were made in 1989 . It just also shows that the unit containing
 the VA3 mother boards will be newer than the ones with the VA2 mother boards. This also shows the 39 S ,serial number
had older chips in it than the 39 W  Serial number which had newer chips in it.

I hope this help out some when looking at the Genesis units.










Thanks


Edited: 11/01/2018 at 02:59 PM by sean42

Nov 1, 2018 at 6:33:19 PM
MODERATOR
flatuswalrus (54)
avatar
(Mr. Dane) < Max Thunder >
Posts: 7697 - Joined: 11/12/2010
Queensland
Profile
I know you've touched on that before but it's good to have a refresher or a further explanation as it can be confusing for some, thanks.

Nov 1, 2018 at 7:08:13 PM
Maverick (0)
avatar
< Flicky >
Posts: 10 - Joined: 09/23/2014
California
Profile
Okay, I'm posting my stuff here since it looks like this list is being maintained, while at Sega-16 it seems to have stalled with pages and pages of serial numbers scattered throughout the forum thread.

Copy pasted.

Model 1: (MK-1601), NTSC
FCC ID: FJ846EUSASEGA
Revision: VA2 (HDG text, Yamaha YM2612, CXA1145 video encoder)
Manufactured Date: Stamped 1989 (26th week) June, 1989 Under PCB (August 1988 on CPU) Motherboard PCB underside reads SEGA 1989 171-5765-11
Serial Number: 39S46028 - Factory 3, Year 1989, Production S, and Console # 46028
Made in: Taiwan

This one is missing the 1 in 1800 USA SEGA font. Anyone know the story behind that? Somewhere during the S production of these consoles the "IF YOU NEED HELP" sticker label the 1 digit was somehow left out. I believe another forum member here at Sega Age or another forum owns one of these uncommon consoles with this particular sticker. I'll try to track down the thread, because I remember reading a post about it last year and forgetting to bookmark it.

Imgur Album
https://imgur.com/a/Z6sGlDI

-------------------------


Edited: 11/24/2018 at 03:23 AM by Maverick

Nov 20, 2018 at 1:04:22 AM
Orangecrushgamer (0)

< Flicky >
Posts: 12 - Joined: 11/19/2018
California
Profile
Going to have to dig mine out somewhere I had one with a serial number in the 200s, May have sold it ,I have one currently which is 30w01794 va3
Hdg, non tmss 68000 chip is 9027, z80 chip is 9028, I wonder if it was repaired at some point as if it was only 1794 that year with chips in the 27th and 28th week that seems low. I will have to look in storage I have 7 or 8 consoles right now. Edit: checked all the others majority are 91 and 92s, one though was 39v66572 hdg non tmss haven’t taken it apart yet though and I believe I have a few more somewhere , just moved and have to find stuff again.


Edited: 11/20/2018 at 01:43 AM by Orangecrushgamer

Nov 21, 2018 at 2:46:50 PM
Orangecrushgamer (0)

< Flicky >
Posts: 12 - Joined: 11/19/2018
California
Profile
A picture , for some reason when I post them they rotate themselves . Bit confused by some marking and or lack of, every other one I’ve seen has had a stamp by the expansion port but this is blank.


Edited: 11/22/2018 at 04:45 AM by Orangecrushgamer

Dec 16, 2018 at 2:54:33 AM
sean42 (0)
avatar
(----FATHER TIME----- VIDEO GAMES IN 1972) < Tom-Tom >
Posts: 97 - Joined: 03/08/2013
United States
Profile
Hi orangecrushgamer.

I can give you an answer to your question. Your system has not been repaired and the dates on the chips make sense.

First your serial number indicates it was made in factory 3 , and the production year was 1990 and since it has a W in the serial number the VA3 mother board is correct.
It just means your was the 1794 unit made in 1990

I hope this help you out a lot.

I have update the list and both of you are on it now. I hope everyone like that the serial numbers are all on the first page and easy to find.
I have gone through the post and updated the list and it should be current now.

Thanks


Edited: 12/16/2018 at 03:26 AM by sean42

Jan 18 at 2:56:35 PM
Karmacutioner (0)
avatar
< Flicky >
Posts: 2 - Joined: 01/18/2019
Oregon
Profile
Not much of a forum poster, but been collecting for a long time and have enjoyed your posts here. Thanks for your research and insights! Always enjoy research on console revisions and video game variants as well. I believe you are correct that the production run numbers for US consoles began with 39S...and went alphabetically from there until the next years production run commenced (and things started getting more expansive and complicated around 1991). So, the “S” run from 1989 would be the first, then the “T” run, etc. Added evidence to this is the 800 number info (versus 1-800) on the shell that only exist on the earliest models which would be the 39s runs. As for why some component parts may be slightly newer in older units, I believe that is easily explained by the production process. It’s likely board assemblers had bins of CPUs and chips they would randomly pull from when assembling the boards. So, the oldest hardware components were not always matched up with the oldest consoles. That being said, the production number ranges of the component parts should be fairly tight within a production run. I could be wrong but this would be my guess.

I have what I believe may be the earliest Model 1 production console that I've seen anyway, if my thoughts on the production labeling process are accurate. Admittedly, I don't think a ton of people necessarily care about how early a console is as much as preferences for certain hardware components, but I think it's kinda cool from a historical perspective. I’m glad some others do as well!

39S00408/6800CPU--8849KE/Z80 chip--8918.

I'm linking to the pics. You'll see that unfortunately some of the components have some corrosion going on as I think someone had this atop a Sega CD and got some liquid under the separation shield. You can even see the outline of the liquid on the case. BUT, it still works! I've got a bunch of other early Model 1s as well. I could probably pull them from storage and record info such as chip numbers, etc, or at least the board type and info you have in your chart. From the excellent info you’ve provided in this thread, and in looking at your list, I’ve yet to see any inconsistencies in the consoles I have. Other than changing the earliest NA consoles to S runs first, T run second, etc., your info seems solid and it’s cool to see what people have. I’d love to see one in the first hundred off the line! I mostly prefer the VA2 boards along with model 2 variants with the 3/4 boards, but I've got some VA6s that sound and look great as well. Thanks again for your work.

https://imgur.com/a/DBPzC4g...


Edited: 01/19/2019 at 02:23 AM by Karmacutioner

Jan 24 at 5:41:23 PM
Karmacutioner (0)
avatar
< Flicky >
Posts: 2 - Joined: 01/18/2019
Oregon
Profile
Ok, I've opened up my non-TMSS Model I consoles (FJ846EUSASEGA) and here's the info from them.
It's interesting to me that my two earliest models have the same supposedly out of manufacturing date sequence 68K chip
number compared to all the others. No idea what to make of that and I'm guessing I'll probably never find out!

#39S00408, VA2, 68K chip--8849KE, Z80 CPU--8918, 800-USA-SEGA

#39S05721, VA2, 68K chip--8849KE, Z80 CPU--8918, 800-USA-SEGA

#39S19299, VA2, 68K chip--8829KD, Z80 CPU--8918, 800-USA-SEGA

#39S55256, VA2, 68K chip--8833LD, Z80 CPU--8922, 800-USA-SEGA

#39S58758, VA2, 68K chip--8833LE, Z80 CPU--8922, 1-800-USA-SEGA

#39T08861, VA2, 68K chip--8837LD, Z80 CPU--8924, 1-800-USA-SEGA

#39U53713, VA2, 68K chip--8901KE, Z80 CPU--8932, 1-800-USA-SEGA

#39V25209, VA3, 68K chip--8922L-, Z80 CPU--8936, 1-800-USA-SEGA

#30S17866, VA3, 68K chip--8940K-, Z80 CPU--8942, 1-800-USA-SEGA

#30T52668, VA3, 68K chip--9001K-, Z80 CPU--9022, 1-800-USA-SEGA

Feb 05 at 12:11:11 PM
sean42 (0)
avatar
(----FATHER TIME----- VIDEO GAMES IN 1972) < Tom-Tom >
Posts: 97 - Joined: 03/08/2013
United States
Profile
Hi Thanks for the information on your consoles. I will try and get them posted.
Yes the age of US units would be the oldest on S and T in the serial numbers.
I am very impress that you found one with the 408 in the serial number. That is something you just not see everyday.


Thanks for your post

Jul 26 at 9:05:38 PM
Orangecrushgamer (0)

< Flicky >
Posts: 12 - Joined: 11/19/2018
California
Profile
Came across a super low one I wanted, it was an 89 with 262 serial but the guy wanted 200$ and it was broken , wouldn't even budge on the price.

Jul 27 at 7:39:23 AM
MODERATOR
flatuswalrus (54)
avatar
(Mr. Dane) < Max Thunder >
Posts: 7697 - Joined: 11/12/2010
Queensland
Profile
You should have stolen it.

Sep 24 at 3:14:24 PM
Curriculum Crasher (0)
avatar
< Flicky >
Posts: 18 - Joined: 03/15/2017
Florida
Profile
I have some more Model 1's to add to the list, if this is still being updated:

#88M32178, VA0, no TMSS, HDG, NTSC-J
#89N07087, VA1, no TMSS, HDG, NTSC-J
#39S04740, VA2, no TMSS, HDG, NTSC
#39S14946, VA2, no TMSS, HDG, NTSC
#30T45990, VA3, no TMSS, HDG, NTSC
#31S77335, VA6, TMSS, HDG, NTSC
#B10139891, VA6, TMSS, HDG, NTSC
#G20028172, VA6.5, TMSS, no HDG, no EXP port, NTSC (has discrete YM2612, so not a VA7)
#020569743, VA6.5, TMSS, no HDG, no EXP port, NTSC (has discrete YM2612, no not a VA7)
#G20136453, VA7, TMSS, no HDG, no EXP port, NTSC (uses ASIC YM3438 instead of discrete YM2612)

-------------------------

 

Sep 25 at 3:27:02 AM
MODERATOR
flatuswalrus (54)
avatar
(Mr. Dane) < Max Thunder >
Posts: 7697 - Joined: 11/12/2010
Queensland
Profile
Originally posted by: Curriculum Crasher

I have some more Model 1's to add to the list if this is still being updated:
If you wish to keep track of the model numbers and other information regarding consoles you own feel free to start a thread which you can update instead of including it all in your signature as it is a bit distracting and takes up quite a bit of room on the forum. It is an impressive list though, thanks very much.

Sep 25 at 8:00:54 AM
Curriculum Crasher (0)
avatar
< Flicky >
Posts: 18 - Joined: 03/15/2017
Florida
Profile
Understood. 

-------------------------

 

Sep 29 at 7:41:34 PM
retro17247 (0)

< Tom-Tom >
Posts: 56 - Joined: 02/17/2017
Profile
I just bought a model 1 on Ebay with serial # 39U33965. Pretty low number, I hope it's a VA2.

Sep 30 at 12:57:51 PM
Curriculum Crasher (0)
avatar
< Flicky >
Posts: 18 - Joined: 03/15/2017
Florida
Profile
I'm pretty sure it will be a VA2. I know that 39U07056 and 39U43057 are both VA2s. 

-------------------------

 

Oct 07 at 5:19:06 PM
retro17247 (0)

< Tom-Tom >
Posts: 56 - Joined: 02/17/2017
Profile
I received it and it's a VA2.  Date code on the 68000 is 8901.


Edited: 10/08/2019 at 12:15 AM by retro17247