Slotexpander wanted

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Por usuario_msx2

Paladin (756)

Imagen del usuario_msx2

22-04-2010, 11:08

are slot expanders are dificult to make ? It looks simple to me... some slots on a printboard ...? Ok i'm not a hardware guru... but they look so simple ...Hannibal
oO!
try to do it yourself.

for example:
http://www.flickr.com/photos/44218601@N06/sets/72157623783899127/
http://www.flickr.com/photos/44218601@N06/sets/72157623908413012/
http://www.flickr.com/photos/44218601@N06/sets/72157623908421876/

Por usuario_msx2

Paladin (756)

Imagen del usuario_msx2

22-04-2010, 11:42

I forgot it:

internal slot expansion in panasonic wx:
http://www.flickr.com/photos/44218601@N06/sets/72157623784027953/

Por edoz

Prophet (2437)

Imagen del edoz

22-04-2010, 16:41

.. ok ... that's looks hard to me ..... but if you can make it on a small printboard .. WinkHannibal

Por usuario_msx2

Paladin (756)

Imagen del usuario_msx2

22-04-2010, 17:41

.. ok ... that's looks hard to me ..... but if you can make it on a small printboard .. WinkHannibal
If you need an printboard then...

http://msx.deneb.nl/page2.HTM

Por RetroTechie

Paragon (1563)

Imagen del RetroTechie

23-04-2010, 23:40

A slot-expander is not a simple straight-through of all signal wires. For example if plugged into slot 2, the #SLTSL signal for that slot is converted into 4 #SLTSL signals representing 2-0, 2-1, 2-2 and 2-3 subslots. This conversion (involving a register at #FFFF in the expanded slot) is... well... 'non-trivial', it requires a bunch of logic circuitry. Sad
internal slot expansion in panasonic wx: http://www.flickr.com/photos/44218601@N06/sets/72157623784027953/
Why? Doesn't the engine in Japanese MSX2+ machines like this allow to expand both slot 0 and 3 (like the S1985 engine) ? Then you have slot 0-0, 0-1, 0-2, 0-3, 1, 2, 3-0, 3-1, 3-2 and 3-3. I know some software doesn't like expanded slot 0, but: if you need a #SLTSL signal to add just 1 specific thing: all the 3-x taken for the memory range you need :-?
Somehow it feels il-logical to add electronics to expand a slot, in a machine like this....

Por usuario_msx2

Paladin (756)

Imagen del usuario_msx2

24-04-2010, 00:47

A slot-expander is not a simple straight-through of all signal wires. For example if plugged into slot 2, the #SLTSL signal for that slot is converted into 4 #SLTSL signals representing 2-0, 2-1, 2-2 and 2-3 subslots. This conversion (involving a register at #FFFF in the expanded slot) is... well... 'non-trivial', it requires a bunch of logic circuitry. Sad
internal slot expansion in panasonic wx: http://www.flickr.com/photos/44218601@N06/sets/72157623784027953/
Why? Doesn't the engine in Japanese MSX2+ machines like this allow to expand both slot 0 and 3 (like the S1985 engine) ? Then you have slot 0-0, 0-1, 0-2, 0-3, 1, 2, 3-0, 3-1, 3-2 and 3-3. I know some software doesn't like expanded slot 0, but: if you need a #SLTSL signal to add just 1 specific thing: all the 3-x taken for the memory range you need :-?
Somehow it feels il-logical to add electronics to expand a slot, in a machine like this....

I'm using a cpld that expands slot 2 (pin 4 slot select)
2-1 used with L.Padial SD/MMC (see floppy disk , no disk drive!)
2-3 used with megaflashrom scc, front on/off rom select switch now for this use
2-0 & 2-2 free (external use with 2 x slot cartidge)

My panasonic WX :512k ram, 2xSD/MMC, megaflashSCC, slot 1,slot 2-0,2-2 free, no floppy disk needed.

;)

Por RetroTechie

Paragon (1563)

Imagen del RetroTechie

24-04-2010, 16:48

L.Padial SD / Megaflash SCC doesn't work in slot 0-x Question btw. you could always re-route / swap some slot signals, like move something from internal 3-x to a 0-x slot (if it works there, and another internal expansion doesn't)...

Por usuario_msx2

Paladin (756)

Imagen del usuario_msx2

24-04-2010, 20:56

L.Padial SD / Megaflash SCC doesn't work in slot 0-x Question btw. you could always re-route / swap some slot signals, like move something from internal 3-x to a 0-x slot (if it works there, and another internal expansion doesn't)...
L.Padial SD & megaflash works fine in slot 0-1
and slot 1-0 1-1 1-2 1-3 or 2-0 2-1 2-2 2-3

Wink

Por Ivan

Ascended (9305)

Imagen del Ivan

25-04-2010, 23:03

Btw, what was the price of Sunrise's 8 slot-expander?

Por Ivan

Ascended (9305)

Imagen del Ivan

06-06-2010, 21:13

sinfox has developed a nice MSX slot expander with 1024kB built-in:

blog.dreamwiz.com/usr/s/i/sinfox/6/sinfox_20100507063538_12732417_1.JPG

I don't know the price. Ask him!: amanohyo (at) hotmail (dot) com

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