thoughts on Digitech Space Station eprom copying?

[Mojsisije]

Does anyone have any extra preprogrammed 27C1001's they could sell me? I'm not keen on buying a programmer just yet for only one chip that I need.

[marmaliser]

Does anyone have any extra preprogrammed 27C1001's they could sell me? I'm not keen on buying a programmer just yet for only one chip that I need.

Where are you ?

[FuzzAldrin]

I am abandoning my XPALL+ idea and just plan on converting my XP200 to an XP300.
I have no use for the XP100, and I never liked any of the tones of the XP400 either. Plus I got a strymon to cover my reverb needs. I owned an XP1000 Jet Pack, so I know I wont get any use from those. All I really want is the Space Station.

Can anyone burn me an XP300 chip? I will pay obviously and I can also provide the chip if necessary.

[Govmnt_Lacky]

I am abandoning my XPALL+ idea and just plan on converting my XP200 to an XP300.
I have no use for the XP100, and I never liked any of the tones of the XP400 either. Plus I got a strymon to cover my reverb needs. I owned an XP1000 Jet Pack, so I know I wont get any use from those. All I really want is the Space Station.

Can anyone burn me an XP300 chip? I will pay obviously and I can also provide the chip if necessary.

Pm'd

[FuzzAldrin]

Can I use 10uF Tantalum caps rated at 16v for the RAM caps, or should I only use 25v?

[digi2t]

If memory serves me correctly, the power supply at that point is down to 5vdc, so 16v caps should be fine.

[Govmnt_Lacky]

Can I use 10uF Tantalum caps rated at 16v for the RAM caps, or should I only use 25v?

I second what Dino says above...

If you have them on-hand, use 16V. If you have to order, ger the 25V 

[FuzzAldrin]

Thanks guys! 

[Mojsisije]

Okay, so I now have a 27C010 chip from marmaliser, and am experiencing the same problem I believe, the second mode doesn't work and the third one is the XP200 mode. I'm still reluctant on getting a programmer, but if someone could get me a tested working EPROM for under 20$ shipped to Cro, I'd be forever thankful, so that I can get to the bottom of this once and for all.

On the other hand, I've already wired everything in, but haven't drilled anything yet, and I got the idea to omit the switch, and use a microcontroller to switch modes and handle bypass. Also I'm planning on making mine true bypass, and possibly even adding the ability to make it able to be used in two different places in the effect chain. I think I got the modes, LED indication and bypass all figured out with an Arduino to control it, I just have to get a working IC and make a schematic and I'll post it up here.

Cheers!

[Govmnt_Lacky]

Are you using the adapter board from marmaliser as well? There were some issues with it and I believe it was discussed here. Might want to check the adapter board and compare it with the diagram in the build document to verify that the proper connections are being made.

[Mojsisije]

No, I made the adapter board from the vero layout in the document. With the corrected placement of the A14 pin. And I omitted the relay part for the XP100 stereo mode.

I should also mention that I'm using an XP400 as the base.

[digi2t]

Who burned the chip? I've looked over the vero/perfboard/PCB versions, and to my eyes, everything looks kosher.

[Govmnt_Lacky]

Who burned the chip? I've looked over the vero/perfboard/PCB versions, and to my eyes, everything looks kosher.

Look like it was marmaliser. HE might need to revisit his burn files and/or where he is getting his chips 

[Mojsisije]

it was indeed marmaliser. I've sent him a recompiled .bin file to try it out.

Also, in the build document, on the vero adapter, the A14 switch point should go a row higher, this way it connects to pin A13 of the 27C1001.

On another note, I've just checked my mailbox and replaced the stock D41464C-80 rams with D41464C-10's, and now I'm having trouble with getting anything to work at all. Oh well, more debugging time.

[digi2t]

it was indeed marmaliser. I've sent him a recompiled .bin file to try it out.

Also, in the build document, on the vero adapter, the A14 switch point should go a row higher, this way it connects to pin A13 of the 27C1001.

On another note, I've just checked my mailbox and replaced the stock D41464C-80 rams with D41464C-10's, and now I'm having trouble with the Reverberator part as well. Oh well, more debugging time.

Please send me the bin file as well; digi2t@netscape.net . I'm just curious.

If you look in the Gallery, I updated the build doc to reflect the correction to the vero, and I also added numbering to the switch lugs in the wiring schematic. The latter posed a problem, since the ALPS switch lug numbers are not perfectly sequential (numbers jumped). Link to doc;

http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=50457

*EDIT*

Also, where did you get your RAM from? I believe I posted about this a while back; I made the mistake of thinking that I had "scored" a great deal on ten D41464C-12's, at $1.38 each. This is what I got;

http://www.diystompboxes.com/smfforum/index.php?topic=100518.0

[Govmnt_Lacky]

On another note, I've just checked my mailbox and replaced the stock D41464C-80 rams with D41464C-10's, and now I'm having trouble with the Reverberator part as well. Oh well, more debugging time.

I "believe" that, if they are indeed good chips, that the -80 should work just fine. The -80 indicated an 80nS response time where the -10 is a 100nS response time. What you DO NOT want to use is the -15 chips.

The -80, -10, and -12 should work fine here. What you might have are either bad chips -OR- they may be loose in the sockets. Did you use the cheap sping-type 18-pin sockets from Tayda?

Dino... feel free to correct me if this is not good info 

[Mojsisije]

I must have an outdated version then, thanks. And my ALPS switch is wired exactly the same way as that.

Also, it seems that something else went wrong because I've returned the original RAMs and still nothing, the only thing that passes sound actually is the Reverberator, the others don't pass sound at all, with the XP300 mode still unavailable.

EDIT: It might be bad RAMs, the ones I've ordered are also NEC Japan, the ones in the device being NEC Ireland, this is where I got them from, when I was still thinking of using an XP100, before the XP400 came into play:

http://www.ebay.ca/itm/400424414582?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

[digi2t]

I've edited my message above.

What G_L says about the sockets is true as well. Make sure to test conductivity from pin to board.

As an aside, I've been burned again of late by the fake IC bug. This time by UTSource, over some MPQ2484 transistor arrays. All had matching serial numbers... and all were duds. I believe it's a clear cue, order a bunch, and if they all sport the same serial number, beware!

I must have an outdated version then, thanks. And my ALPS switch is wired exactly the same way as that.

Also, it seems that something else went wrong because I've returned the original RAMs and still nothing, the only thing that passes sound actually is the Reverberator, the others don't pass sound at all, with the XP300 mode still unavailable.

EDIT: It might be bad RAMs, the ones I've ordered are also NEC Japan, the ones in the device being NEC Ireland, this is where I got them from, when I was still thinking of using an XP100, before the XP400 came into play:

http://www.ebay.ca/itm/400424414582?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

I hate to say it, but they might be duds as well.

This is a reliable source;

http://www.ebay.ca/itm/RAM-D41464C-12-NEC-18-Pin-DIP-41464C-41464-/370263994587?pt=LH_DefaultDomain_0&hash=item56357430db

And I think that G_L also gets them from Jamesco. Correct me if I'm wrong bro.

[Mojsisije]

The sockets were the ones that came with the XP400 unit. I don't mind so much if they are duds, eBay buyer protection's got me covered, but what I'm worried about is that the device won't work with the old RAMs installed, not even in the modes it - DID - work in before.

[Govmnt_Lacky]

The sockets were the ones that came with the XP400 unit.

The XP400 only comes with 3 of the 4 RAM sockets installed and populated. You need to have ALL 4 sockets and RAMs installed to get the XP300 Space Station.

Furthermore... the XP100 and XP200 only use 1 of the RAMs. It would stand to reason that if you are getting the XP400 to work that the 100 and 200 "should" work as well as the chips are cascaded.

Is there any way you could post some pics of your PCB? Might be able to see an issue.