Msx turbo-r fs-a1st motherboard versions?

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Por popolon_

Resident (57)

Imagen del popolon_

09-04-2020, 07:52

Have there been MSX turbo-r FS-A1ST versions with and without RF output? Or what is this motherboard without RF output at all?

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Por popolon_

Resident (57)

Imagen del popolon_

09-04-2020, 09:43

Added high res link.
https://msx.pics/image/Viqks

Por dproldan

Supporter (16)

Imagen del dproldan

09-04-2020, 10:26

That looks like a preproduction unit. There are many more changes compared to a standard A1ST, but the most interesting is the R800 IC in the bottom, on the left of the RAM. That kind of packaging is used during the development stages of new ICs.
Nice find!

Por popolon_

Resident (57)

Imagen del popolon_

09-04-2020, 10:36

So if this is preproduction unit, is the 256K memory upgrade same as for normal unit? Or risk of damaging this unit? Anyway transformer change to 220v shuold not make harm?

Por dproldan

Supporter (16)

Imagen del dproldan

09-04-2020, 10:51

What you have is extremely rare. Companies only make 5-10 units of this kind during the development process and most of them are destroyed after the product goes into real production.
So, I wouldn't do any modification to it. Maybe the conversion to 220v if you're experienced with this stuff. The memory upgrade is a lot more delicate and invasive.
Try to dump the ROMs, as they are probably unique. Here are some instructions: https://www.msx.org/forum/msx-talk/emulation/dumpingreverse-engineering-msx

Por PAC

Guardian (5660)

Imagen del PAC

09-04-2020, 13:17

What's the S/N? Probably it will give us more clues... take a look:

https://www.msx.org/forum/msx-talk/hardware/how-many-turbo-r...

Por popolon_

Resident (57)

Imagen del popolon_

09-04-2020, 13:47

There is no serial number at the back, just empty there.

Por popolon_

Resident (57)

Imagen del popolon_

09-04-2020, 14:23

also the keyboard is not same as for production ?
https://msx.pics/image/Vi7CN

Por Meits

Scribe (5857)

Imagen del Meits

09-04-2020, 15:24

That's an MSX2+ keyboard. They were there before the grey turbo R ones. So either the grey keyboards did not exist yet, or the previous owner did a swap.

Por popolon_

Resident (57)

Imagen del popolon_

10-04-2020, 08:58

Here is closer pic link from nec and r800 chip. Also white rom socket can be seen barely.

https://msx.pics/image/Vibdd

Por popolon_

Resident (57)

Imagen del popolon_

13-04-2020, 20:15

I dumped the tc574000D rom chip, and according to Nyyrikki, it was same as production version.

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