Amiga Custom Chips and mystery components

[weirdami]

I added some Amiga custom chips to my for sale page. Please, buy them! :-)

Also, I have put up two pages of electronic components that I don't know what they are. I need help identifying them. I think some of them might have been pulled from an Amiga 3000, but I'm no expert. If you know what they are and want to buy them, make me an offer. I don't know if they work, though, so make your offer accordingly.

edit: I make thanks to you smarty pants people that helped me figure out what that stuff was.

[Brian]

Ehm... Some are pritty easy:


Mystery components page 1
1=Crystal of unknown Mhz
2=Crystal of 64Mhz
3=Empty 48pin socket (not 40pin Kickstart)

Mystery components page 2
1,2,4,5,7,8= Damaged memory chip
3,6= 70ns Memory chip suitable for A3000 (need at least 4 at a time)
9=Crystal of 75Mhz
10=Probably 1 of 3 chips used to passivly terminate a SCSI drive on the drive itself.

[Amiduffer]

Hi. The chips in the second mystery page are ZIP memory chips. You have quite a mixed bag there.

Look at those poor bent legs. awwww.

[weirdami]

@both you dudes

You guys are both advanced Amiga hardware knowledgeable persons! :-)

@brian

Do you mean damaged as in squigly legs?

[melange]

Yep, Brian nailed it good.
No 10: is a resistor pack, that could be for SCSI termination or something else perhaps.

[weirdami]

Oh, hey, it turns out that I have three of those number 10 guys. Should I ship them to that guy I just sold my 2 external SCSI hard-drive cases to so they will work right or are they only really needed for, say, drives mounted inside an Amiga?

[Brian]

There are legs missing from the chips I described as "damaged". If a leg is missing it's ready for the scrapper (unless some of the old pin is still available cause then there might be a chanse of soldering on a new leg to what's left of the old one... doesn't look to be possible on these chips though).

[weirdami]

@Brian

I see what you mean about the legs. I guess I'll have to put these up for really, really cheap or maybe just make millenium bug models out of them. :-)

[Brian]

With 3 of them on the drive itself it can be terminated so no extra terminator is needed on the SCSI cable.

Most external cases have a passthrough for further SCSI devices and requiers an external terminator on this passthrough connector. Once in a while you find a SCSI case that doesn't sport this feature and then the internal device need to be terminated either on the device itself or on the SCSI cable inside.

Due to this I don't think you need to worry about shipping the 3 resistor packs... store them for your own internal SCSI needs.

[Zac67]

The terminators are just resistor packs (arrays) for passive termination. 221/331 means 22 x 10^1 / 33 x 10^1, thus 220/330 Ohms.

In an A3000 you'd need sets of 8 of the ZIP chips - each one is 4 bit wide, 4 x 8 = 32. I could use a set of 514402 - but they're too beaten up, even for me.  ;-)

[X-ray]

That first oscillator looks exactly like the 50mHz oscillator from my Cyberstorm MKII. It had the same white tape and red glue on it.
The 64mHz oscillator is the same as the one I have on my Cyberstorm PPC.

[ethierbach]

@weirdami
No need to send along the resistor packs.  I like using external terminators, so I can reconfigure the chain without having to take drives out.  Thanks for thinking of me, though. :-)

[odin]

X-ray wrote:
That first oscillator looks exactly like the 50mHz oscillator from my Cyberstorm MKII. It had the same white tape and red glue on it.
The 64mHz oscillator is the same as the one I have on my Cyberstorm PPC.

You must be really afraid of overheating your PPC hardware if you underclock that much :-D.

[Lemmink]

I guess you can remove the Rev.7 busters from the customchip section, as no one would even pay 10ct for it. The Rev.11 Buster on the other hand is well priced at 15 $

[weirdami]

@Lemmink

10 carat's for a custom chip? It's a deal. Hand those diamonds over! :-)