thoughts on Digitech Space Station eprom copying?

[mongo]

Opened my commodore, no dice, no good ol' 41464 inside 

[marmaliser]

PM sent re the ram

[digi2t]

PM sent re the ram

marmer to the rescue!! 

[Govmnt_Lacky]

Just a quick thought...

Try to meter out the sockets for the added RAM. It would be a shame to buy new chips and find out you had a cold/bad solder joint.

Food for thought.

[mongo]

I've been very busy since last week, I hope to update the status of my mod this weekend

[Swamp]

Searching somo info for the ram on comodore and amiga 1000 websites.

here some compatible rams.

http://www.c64-wiki.de/index.php/RAM/Herstellercodes

[Govmnt_Lacky]

I've been very busy since last week, I hope to update the status of my mod this weekend

Any update on this?

Searching somo info for the ram on comodore and amiga 1000 websites.

here some compatible rams.

http://www.c64-wiki.de/index.php/RAM/Herstellercodes

Cheers! And thanks for the link 

[Swamp]

tested today some of the chips I bought last year for this Xp-all Project.
NEC USA D41464C-10 8937VA91   OKAY


I tested one of the XP200 I have and it sound like shit, the modulated sound is very distorted.  
The signal enter okay in the ADC, and get´s out bad from the DAC.
The DAC is a CS4330 from Cirus logic, obsolete now.
http://floe.butterbrot.org/matrix/hacking/limp/docs/cs4330.pdf

After some search the equivalent is an CS4338 by cirus logic too.
http://www.cirrus.com/jp/pubs/proDatasheet/CS4334-5-8-9_F6.pdf

Really hope its the DAC that is faulty.

Those chip are prety cheep, maybe it can be a improvement on the xp sound. I will see.


UPDATE
used the DAC and ADC from another unit. and they are okay.
Anyone had this problem with any XP family pedal?

[Swamp]

and more...

To have an output Volume control.

Why not making the same as done on the Line6 DL-4?

a pot in the place of r27 and r18 to control the gain of the output opamp U5

or maybe changing r25 and r23.

Not interested in making such mod, but i can try.

[slacker775]

I'm getting my XP-100 -> XP-ALL+ build started and have a likely simple question - from what I can tell from the doc, the only wiring from the main PCB to the EEPROM adapter board is the two for R30, correct?  The 5V that I pull near the regulator goes to the switch and provides + for the LEDs, and VSS from the adapter PCB is ground, used at the switch as well as the LEDs.  The wires from the MC34064P connect to the 6P4T.  A14/15/16 from the adapter go to the switch for switching firmware from the EEPROM.

[digi2t]

I'm getting my XP-100 -> XP-ALL+ build started and have a likely simple question - from what I can tell from the doc, the only wiring from the main PCB to the EEPROM adapter board is the two for R30, correct?  The 5V that I pull near the regulator goes to the switch and provides + for the LEDs, and VSS from the adapter PCB is ground, used at the switch as well as the LEDs.  The wires from the MC34064P connect to the 6P4T.  A14/15/16 from the adapter go to the switch for switching firmware from the EEPROM.

Vss connects only to the side of the switch that will relate to A14/15/16. I'm not sure if mixing/using it with the chassis ground will affect anything. I believe digital stuff tends to be fussy when it comes to grounds, and I can remember if Vss comms with the chassis ground too. Use the chassis to ground your LED's instead, just in case.

This is what I think, but Greg will chirp in to correct me if I'm wrong. He's been around the block a few times with these builds.

Everything else reads correct to my eyes. The diagram in the build doc is pretty clear, but if there's anything that can be improved, don't be shy to point it out. The document, as is life, is always a work in progress.

[slacker775]

The VSS stuff did sound fishy to me, but I think the way it's worded in the doc may be unclear.   For chassis ground, there is a pin off the adapter that I should be able to use then if I'm not mistaken.

[digi2t]

The VSS stuff did sound fishy to me, but I think the way it's worded in the doc may be unclear.   For chassis ground, there is a pin off the adapter that I should be able to use then if I'm not mistaken.

If you could, please PM me the offending wording, and I'll see to clarifying (to the best of my abilities).

Cheers.

[the3secondrule]

Admittedly, I haven't read this whole thread, but I've searched and can't find an answer:

Is there any sub for the J113 jfet? I think it's the only thing that I am missing. If it's used for switching then I assume a j201, 2n5457, or 2sk30a should be ok?

[Govmnt_Lacky]

Admittedly, I haven't read this whole thread, but I've searched and can't find an answer:

Is there any sub for the J113 jfet? I think it's the only thing that I am missing. If it's used for switching then I assume a j201, 2n5457, or 2sk30a should be ok?

I have only used the J113 so I could not say. They are still in production and are very easy to come by.

If you need any, PM me here or at MBP and I 'll see what I can do 

[the3secondrule]

Admittedly, I haven't read this whole thread, but I've searched and can't find an answer:

Is there any sub for the J113 jfet? I think it's the only thing that I am missing. If it's used for switching then I assume a j201, 2n5457, or 2sk30a should be ok?

I have only used the J113 so I could not say. They are still in production and are very easy to come by.

If you need any, PM me here or at MBP and I 'll see what I can do 

Thanks man,

If I can't find a local solution, I'll hit you up! I'm in New Zealand, but I don't imagine postage on a couple of FETs will kill me

J

[slacker775]

I got mine from mklec on eBay.  Not sure how their shipping to NZ might be.

[the3secondrule]

$20 shipping on $5 worth of FETs from Mklec...

Lost of cheaper options on the bay though.

[digi2t]

Check Nightfire Electronics. They stock them, and I think the shipping might be more reasonable. Choose a quantity for the cart, fill out your shipping info, and scroll down to the "Click to calculate shipping" button.

[the3secondrule]

Thanks Dino,

Shipping from Nightfire was much more reasonable

J