different VG8235 revision boards ?

By marcoexo

Expert (83)

marcoexo's picture

07-01-2018, 18:25

I recently came across an MSX2 Philips VG8235, my board matches the service manual, but I've seen different boards too, like here http://www.wumpus2000.de/Homecomputer%20neu/Computers/Philip... (missing the little sub pcb) and this http://bilgisayarlarim.com/Philips/VG-8235/VG-8235_01.jpg (using a gate array)... How many different boards have been made for this model ?

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By Philip

Champion (373)

Philip's picture

07-01-2018, 21:05

There a are two revisions, it's all explained in the wiki.

By Lord_Zett

Paladin (807)

Lord_Zett's picture

07-01-2018, 21:10

3 versions......

the /00 is a bigger board lot like the 8230.
then there is the /19 version. it got a error on the board and there is was a repair action. then there is most of the time a sticker over the /19 for /20

and then there is the /20 realy close to the nms8245 the mobo

By marcoexo

Expert (83)

marcoexo's picture

07-01-2018, 21:28

Thanks for pointing me at this, I did read it and could not find anything about the two models, but effectively the difference is just evident by looking at the two different downloadable service manuals Smile

By Lord_Zett

Paladin (807)

Lord_Zett's picture

07-01-2018, 21:34

yeah the first version of the vg8235 the mobo is max size in the case.

By marcoexo

Expert (83)

marcoexo's picture

07-01-2018, 21:34

Lord_Zett wrote:

3 versions......

the /00 is a bigger board lot like the 8230.
then there is the /19 version. it got a error on the board and there is was a repair action. then there is most of the time a sticker over the /19 for /20
and then there is the /20 realy close to the nms8245 the mobo

I have a /19 the error you refer to is the "inaccessible second bank memory mapper", or something else ? I've run testram on it and it says ok....

By Lord_Zett

Paladin (807)

Lord_Zett's picture

07-01-2018, 21:56

marcoexo wrote:
Lord_Zett wrote:

3 versions......

the /00 is a bigger board lot like the 8230.
then there is the /19 version. it got a error on the board and there is was a repair action. then there is most of the time a sticker over the /19 for /20
and then there is the /20 realy close to the nms8245 the mobo

I have a /19 the error you refer to is the "inaccessible second bank memory mapper", or something else ? I've run testram on it and it says ok....

yeah that is it. mine got a extra board on it mounted to the mobo to fix that