Canon V-20 Slot layout

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By rderooy

Paladin (686)

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15-02-2018, 13:44

We have some conflicting data on the slot layout of the Canon V-20 systems. There are three known variations
- Japanese
- French
- UK

According to the service manual, which documents the UK and French variations the memory is in Slot 3 which is not expanded. But according to the openMSX machine profile for both the UK variation (Canon_V-20.xml) and the Japanese variation (Canon_V-20_JP.xml) the memory is in expanded slot 3-0.

Can someone from the openMSX team confirm that this is correct?

The slot layout is on page 21 of the service manual: http://msx.hansotten.com/uploads/files/canonv20sm.pdf

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By mars2000you

Enlighted (6428)

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15-02-2018, 14:06

I think openMSX config file is wrong, it's probably based on this picture:

https://plus.google.com/photos/112629367302659371233/album/6...

But this another picture clearly says that there is no secondary slot register:

https://plus.google.com/photos/112629367302659371233/album/6...

The confusion with first picture comes from the fact that the rom dumps were not made with a data tape recorder or a disk drive.

By gdx

Enlighted (6069)

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15-02-2018, 14:35

I think it's a mistake from the openMSX team. Canon would not extend a slot for nothing. This requires more components.

If a guy has a real Canon V-20 he can check by entering the POKE-1,255 instruction. It will not crash if it's a primary slot.

By mars2000you

Enlighted (6428)

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15-02-2018, 20:19

Msxholder has confirmed that slot 3 of Canon-20 is not expanded.

He has also mentioned that slot 2 (with sub-rom) of Sanyo MPC-25 is not expanded (another error in openMSX config files), but the Sub-ROM is mirrored over pages 0 to 3 of this slot.

By rderooy

Paladin (686)

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15-02-2018, 20:19

For completeness, which variation did Msxholder confirm that on?

By mars2000you

Enlighted (6428)

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15-02-2018, 20:24

Canon V-20 (EU)

As the available manual is also for the French version and as the picture I've mentioned says the same for the Japanese machine, we can conclude that all variations of Canon V-20 don't have the slot 3 expanded.

By Manuel

Ascended (19270)

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15-02-2018, 20:58

The Canon V-20 in openMSX has been like this since 2004. I'm changing the config as it's obviously wrong.

By rderooy

Paladin (686)

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15-02-2018, 21:12

Manuel, did you also see the comment above about the Sanyo MPC-25 config also being wrong?

By Manuel

Ascended (19270)

Manuel's picture

15-02-2018, 21:16

I also fixed the Sanyo MPC-25FD. Thanks for mentioning it, mars2000you! Original info was here: https://www.msx.org/forum/msx-talk/trading-and-collecting/ms...
But with your 'fixes', I get exactly the same output in openMSX now, without having the slot expanded. It also seemed quite unlikely, but I guess it's some glitch in getrom.bin.

Anyway fixed now!

More things that need fixing? Please let me know!

By mars2000you

Enlighted (6428)

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15-02-2018, 21:28

It's thanks to Msxholder! Smile

By Manuel

Ascended (19270)

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15-02-2018, 21:30

So please let me know if there's something else that needs fixing.

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