Add to NMS8250 third SLOT

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Por Taburoto

Champion (296)

Imagen del Taburoto

22-03-2011, 15:33

Hi everyone!

Does anyone around here has added the third slot to a philips NMS8250 through the internal connector MY?

I want to make this extension but the information I have is enough for my level of electronic, and Holland.

If anyone knows of that is, thanks more info.

Greetings!

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Por luppie

Paladin (854)

Imagen del luppie

22-03-2011, 15:35

Tal vez sea más fácil para publicar en Inglés

Here you can find an English version of SLOT3 : http://www.msxarchive.nl/pub/msx/docs/hwmodsetc/hanso/hwmodsetc/philipsnms82xxslot3.pdf
It's not the MY connector version, but an other one.

Por bartl68

Expert (86)

Imagen del bartl68

22-03-2011, 20:39

@Taburoto what's your email so i can send you some documentation about this one.

edit : the MY connection version can also be found with this direct link : http://www.passionmsx.org/modules/newbb/dl_attachment.php?attachid=1240759106&post_id=1332

so nomore email account is needed from you Taburoto :P

Por luppie

Paladin (854)

Imagen del luppie

12-04-2011, 12:00

I'm also busy building a 3th slot in my NMS8250.
Just finished modding the 3th slot into the housing and i'm realy happy how it worked out.

upload.luppie.net/uploaded/3thslot_2.jpg

upload.luppie.net/uploaded/3thslot_1.jpg

I had to give up my 2nd drive, but on the other hand I hardly use diskdrives at all, so I wont miss it.

Por FiXato

Scribe (1520)

Imagen del FiXato

12-04-2011, 12:27

flashcarts are the new floppydrives anyway Tongue

Por luppie

Paladin (854)

Imagen del luppie

07-03-2014, 21:52

Probably you have noticed, that I'm finishing my unfinished projects Big smile
One of those projects is adding a 3th slot to a NMS8250

The mechanical part of the project I had finished almost 3 years ago, but the electronical part is still not finished. Somehow I cant get it to work, so I'm asking for help.

My goal is to get this to work using this instruction.

I prever this version above the MY connector version, because this version uses the buffers. But this makes it also a bit more complex.

I followed the entire instructions and getting a black screen. Then I found some comments

Quote:

Additional information by Luciano Sturaro (via Ricardo Jurczyk Pinheiro): add pull-up resistors (10K will do) to pin 6, 8 and 11 of the new 74LS15, because the 74LS15 has open collector outputs.

So I've added the pull-up resistors to the 74LS15 and the MSX boots up normaly, but none of the 3 slots work. When I replace te 74LS15 with the 74LS08, Slot 1 and Slot 2 works normaly.

I already found one thing in the instruction, that is wrong, so I'm wondering if someone else ever used this instruction and if this instruction has more errors.

The step (that I think) is wrong is :

Quote:

15. Connect pen 1 of IC143 with pen 4 of slot 3 connector (BUSDIR)

The /BUSDIR signal needs to be on pin 10 and not 4 (SLTSL3.1)

Also I think the 3th slot needs to have it's own /INT signal, but i'm not sure.

What am I missing and/or does anyone knows how to achieve to add a 3th slot using the buffers?

Por flyguille

Prophet (3029)

Imagen del flyguille

07-03-2014, 23:06

/INT is pulled up, any low state will trigger the interruption, don't matther from where is coming.

is a task of the software to recognize what kind of interruption was.

Por luppie

Paladin (854)

Imagen del luppie

07-03-2014, 23:28

Ok, so I can use the /INT provided from the 1st or 2nd slot. But still somehow it doesn't work.
Also the use of the 74LS15 is not clear to me, in orther schematics for slotexpanders I see that a 74LS21 is used to combine the BUSDIR signal of all 3 slots.

Por floppiefrans

Master (237)

Imagen del floppiefrans

09-05-2017, 10:28

Someone ever managed to get this working?
Luppie, did you manage to get it work?

Por hamlet

Scribe (2822)

Imagen del hamlet

09-05-2017, 21:45

I wonder if it´s possible to upgrade a Sony HBF700 with a third slot. While examining my T600 (the Sony, not the Terminator one), which have a internal third slot connected the modem, it should be practicable. But this is another story I guess...

Por raulsantacruz

Hero (534)

Imagen del raulsantacruz

09-05-2017, 22:39

hamlet wrote:

I wonder if it´s possible to upgrade a Sony HBF700 with a third slot. While examining my T600 (the Sony, not the Terminator one), which have a internal third slot connected the modem, it should be practicable. But this is another story I guess...

Yes. This internal third slot is amazing. Probably you can try to swap the front of other Sony HBF700 with this (only if you are sure about what are you doing ;D ) I'm happy you enjoy the T600 !! Hannibal

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