Connecting Gouda slot expander on Toshiba HX-10

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By Louthrax

Prophet (2051)

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16-02-2017, 05:12

So my Toshiba HX-10 has an extension port on the back (that's not a cartridge port), with a cable plug on which it seems I could connect my Gouda slot expander cable (just need to remove the foolproof notch on the Gouda cable).

Has anybody ever tried that or knows if the pins are compatible?

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By Jipe

Paragon (1365)

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16-02-2017, 12:36

By Wild_Penguin

Hero (538)

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16-02-2017, 15:50

Hi!

TL;DR: You can switch even and odd pins of a pin header with the help of: 1) 2 x 50-pin flat cable connectors, 2) 2x25 straight pin headers meant for a PCB and 3) a short strip of flat cable (assuming the short part of the pins is long enough to make contact, which it was at least with the parts I sourced).

As Jipe's link is in French, I don't understand it but I can see the pictures.

Also I know nothing about the Gouda extender.

However, if I understand correctly, the problem is that even and odd pins are reversed (there are two versions of the expansion port in MSXes). A breadboard - as in the pictures - is a cleaner way, but more labor intensive way to achieve the same thing I needed previously myself in this thread. Never mind the "inserting cartridges reversed" -part - you do NOT need to do that, I'm not sure what I was thinking; the "beginning" of the cart - or flat cable connector in hist case - is still going to point the same way.

Note however I do not know the Gouda (is that cheese?) thing at all so I may have misunderstod (guessed) the problem.

EDIT: More generally, the expansion port pinout is exactly same as the cartridge pinout, except even<->odd pins are sometimes swapped (depending on MSX model).

By Jipe

Paragon (1365)

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16-02-2017, 15:52

Louthrax is French Wink

By Wild_Penguin

Hero (538)

Wild_Penguin's picture

16-02-2017, 15:57

Now I looked at Jipe's thread more carefully (EDIT: yeah, it's a bit difficult for me to follow, but not so for Louthrax, as Jipe pointed out, sorry for the noise).

I think it is not actually doing any pin swapping - only working as a expansion port -> cartridge port adapter. However, From this link I've gathered the Gouda expander has a cartridge, which has a 50-pin flat cable connector at the top.

So I guess the real question is, If the cart is just an adapter (without any electronics or pin order swapping inside) or not.

By Louthrax

Prophet (2051)

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18-02-2017, 11:21

Thanks Jipe and Wild_Penguin for the answers! I think I'll be reasonable and just build myself a little adapter like described in Jipe's link. I don't want to damage my precious Gouda slot expander, that's one of my favorite MSX device Smile (even opening the cartridge adapter requires damaging the sticker I think !).

By gdx

Prophet (2775)

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18-02-2017, 13:08

Open the HX-10 to locate the pin 1 and check with an ohmmeter if the slot expander has the pin 1 at the same location, then check the location of the GND pin and the pins of the voltages. Off course keep the MSX and the slot expander to do it.

If you do not want to open your HX-10, this picture can help:
http://bilgisayarlarim.com/Toshiba/HX-10/Toshiba_HX-10_01.jpg

Do not forget to put an external power supply to the slot expander!

By gdx

Prophet (2775)

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18-02-2017, 16:03

gdx wrote:

Off course keep leave the MSX and the slot expander to Off do it.

By Louthrax

Prophet (2051)

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22-03-2019, 23:27

So two years after this post, I finally found an old SCSI cable an a cartridge slot in my attic Smile
Time for some extended soldering this week-end!

By the way, I,m also wondering wether the slot (3) on the HX-10 is expanded or not?

By Manuel

Ascended (15451)

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23-03-2019, 07:41

By gdx

Prophet (2775)

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23-03-2019, 09:38

Yes, you can find all the information in the wiki.

The modification to add the sound pin is for the HX-10DP. The PCB of the HX-10 is a little different but I think you should be able to adapt it easily.

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