HW shortage ?

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Por sd_snatcher

Prophet (3486)

Imagen del sd_snatcher

20-07-2010, 22:59

There is a thread on the MRC about one of the best slot-expanders once available for MSX: link

that's cool !

But where can I find the diagrams for this expander ?

Does anyone (Else) have these?

I do own two of those expanders and I can assure they are an excellent product.

The only thing I miss is on the aesthetics point: a plastic case to cover the upper side of the circuit board. When I show my MSX to friends they always thing that the expander is some kind of prototype or unfinished design.

Por marlon-B

Expert (88)

Imagen del marlon-B

21-07-2010, 19:27

mail with request was sent !

still no answer from that Carchano fellow ...

I'll wait until this weekend and if by then no answer I'll start building and testing the KC 3.0/3.1 slot-expander.
Unless there are people who have info about problems that exist with this expander???

user-experiences are welcome...

Por OeiOeiVogeltje

Paragon (1402)

Imagen del OeiOeiVogeltje

22-07-2010, 01:41

go make the 3.1 expander
a loose case with a cable is easier to handle than a pcb you have to stick in a slot

Por SLotman

Paragon (1238)

Imagen del SLotman

22-07-2010, 02:05

still no answer from that Carchano fellow ...

Don't hold your breath... Carchano is very good at making hardware, but answering emails definitively isn't one of his strongest points Tongue

Por marlon-B

Expert (88)

Imagen del marlon-B

22-07-2010, 17:27

well I have ordered just enough parts for 8 slotexpanders.

btw I now get most of the parts (for the slotexpander) from Digikey because I can only find the 2x25 CARD EDGE CONNECTOR at digikeys,
but with shipping and customs/import costs it becomes quite expensive.
Thus making the slotexpander more expensive. I dont want that and you dont want that !

So does anybody know where to find the 2x25 connector in The Netherlands or Germany or Belgium??
I dont know how the connector is called in spanish/french/polish/cszech...otherwise I could search those countries as well.

Too bad Mouser does not have them. With mouser no VAT/import costs over big orders. They pay it for you

I'll start building the proto-type this weekend.
I'll keep you all informed on my progress...

Por Bastiaan

Champion (333)

Imagen del Bastiaan

23-07-2010, 08:51

what is the price to beat?
creative solution: can you use a bigger connector and block the extra pins with a piece of glued in PCB?

long shot: http://www.farnell.com/cad/320433.pdf

Por marlon-B

Expert (88)

Imagen del marlon-B

23-07-2010, 22:47

what is the price to beat?
creative solution: can you use a bigger connector and block the extra pins with a piece of glued in PCB?

long shot: http://www.farnell.com/cad/320433.pdf

Larger connector means larger PCB. So rather not. You pay by the mm when ordering PCB boards.

Por marlon-B

Expert (88)

Imagen del marlon-B

15-08-2010, 20:21

PROGRESS UPDATE:

Finished standard version prototype of slotexpander based on MK 3.1 design but with some of my own revisions.
It's now a full SMT-design.

Everything works perfectly ! Even without external power it remains stable because of low power components.

Was suggested to integrate several hardware into one device. After thorough investigation and testing
I've decided to add some extra's:

- 512K SRAM (which can be used as memmapper or switched to flash-mode to run normal roms)
- integrated SD-interface (my own design with 32k buffer memmapped access VERY FAST!!)
- Real Time Clock
- USB interface

In order to integrate the above mentioned 1 slot needed to be sacrificed.
So only 3 msx-standard slots on the slotexpander.

Would this be acceptable ?

Por Creepy

Champion (335)

Imagen del Creepy

15-08-2010, 20:36

The reason for me for getting a slot expander would be to insert a mem. mapper, sd interface and stuff like FM-PAC etc. Sacrificing one slot for an intergrated SD interface and 512KB ram extension would be very acceptable Smile Depending on the price: this would be an instant buy for me.

Por marlon-B

Expert (88)

Imagen del marlon-B

15-08-2010, 21:09

The reason for me for getting a slot expander would be to insert a mem. mapper, sd interface and stuff like FM-PAC etc. Sacrificing one slot for an intergrated SD interface and 512KB ram extension would be very acceptable Smile Depending on the price: this would be an instant buy for me.

Can't say anything about the pricing yet cause it's not finished yet.

But smd-components are usually cheaper than through-hole.

But will try to keep it as low as possible.

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