HD SCSI for PowerMac 7600

[indibil]

Hello, it is possible to use some "modern" SCSI-3 HD with 80 pin port, with 50pin-80pin adapter in this Power Mac?

The adapter is this:

https://es.aliexpress.com/item/1005...st_main.5.1a28194dxKExW3&gatewayAdapt=glo2esp

And the HD may be one of this:

https://es.wallapop.com/item/disco-duro-scsi-822641207

Thanks.

 

[ArmorAlley]

Hello, it is possible to use some "modern" SCSI-3 HD with 80 pin port, with 50pin-80pin adapter in this Power Mac?

The adapter is this:

https://es.aliexpress.com/item/1005...st_main.5.1a28194dxKExW3&gatewayAdapt=glo2esp

And the HD may be one of this:

https://es.wallapop.com/item/disco-duro-scsi-822641207

Thanks.

It should do.
I used to run an 80-pin U320 SCSI server drive in my Performa 475 so I'm fairly sure that it'll run in your PM 7600.
Make sure that the server drive support SE (Single-ended) mode.
It will usually have SE/LVD (or maybe LVD/SE) written on the label.
The power draw from these drives can be greater than standard SCSI drives from 1996 but if my P475 could handle the 72GB drive, then I expect that your PM 7600 will do too.

 

[Phipli]

The adapter is this:

Those adapters lack termination and don't tend to work sadly.

 

[indibil]

It should do.
I used to run an 80-pin U320 SCSI server drive in my Performa 475 so I'm fairly sure that it'll run in your PM 7600.
Make sure that the server drive support SE (Single-ended) mode.
It will usually have SE/LVD (or maybe LVD/SE) written on the label.
The power draw from these drives can be greater than standard SCSI drives from 1996 but if my P475 could handle the 72GB drive, then I expect that your PM 7600 will do too.

72GB on a performa 475? awesome!!!! I wouldn't know what to do with so many GB!! hahaha. on my 475 I have a BlueSCSI.

Those adapters lack termination and don't tend to work sadly.

Thank you both very much for the help, I'm going to try it, the HD is not very expensive and neither is the adapter.

THANK YOU!

 

[slomacuser]

I bought adapter from @max1zzz and works fine it was 4 EUR expensive than one on link but trusted to work ...

 

[ArmorAlley]

Those adapters lack termination and don't tend to work sadly.

There are pins for TPR (upper left) on the adapter in the link.
And even if it didn't, some HDs allow termination on the disk itself.
One could also use a 50-pin SCSI cable with several plugs and terminate the last port.

 

[indibil]

I bought adapter from @max1zzz and works fine it was 4 EUR expensive than one on link but trusted to work ...

There are pins for TPR (upper left) on the adapter in the link.
And even if it didn't, some HDs allow termination on the disk itself.
One could also use a 50-pin SCSI cable with several plugs and terminate the last port.

Perfect!!! Well, the seller told me that other users bought discs for old Amigas and it doesn't work for them.

Is there a link that explains how to configure the adapter jumpers? I am not very expert in SCSI, as a child I had an LC and I only used the internal hard drive, nothing more, I was lucky to have the computer, I could not order accessories, and my next computer after many years was a G4.

 

[Phipli]

There are pins for TPR (upper left) on the adapter in the link.
And even if it didn't, some HDs allow termination on the disk itself.
One could also use a 50-pin SCSI cable with several plugs and terminate the last port.

Yes, there is a jumper for it, but no actual termination on the PCB. The sellers mis-sell them.

And even if it didn't, some HDs allow termination on the disk itself.

Only a small number do.

Someone please back me up here -

@cheesestraws @max1zzz @GRudolf94 @Bolle @joshc ?

 

[Phipli]

I bought adapter from @max1zzz and works fine it was 4 EUR expensive than one on link but trusted to work ...

This - max1zzz makes adapters that include proper termination.

 

[chelseayr]

I've for quite a while been looking into trying buy one or two 36gb hdds for myself and it may indeed seem a bit large but at least it'll let me do several bunch of 'full install' cd games beside keeping a local folder of historic-sized movies etc. I know 72gb seem more frequent on ebay but I'm not too sure if thats indeed for me tho but mm yeah

 

[cheesestraws]

Thirding recommendation of Max's adaptors: not expensive and work well.

 

[indibil]

Thirding recommendation of Max's adaptors: not expensive and work well.

I live in Spain, importing from the United States is complicated and expensive. From China they manage the IOSS from there and it is easy for me.

 

[slomacuser]

I live in Spain, importing from the United States is complicated and expensive. From China they manage the IOSS from there and it is easy for me.

Max1zzz is from UK

 

[cheesestraws]

Most of the people in this thread are from various bits of Europe! Max is in the UK.

 

[indibil]

Oh! That is somewhat better, but Spain's problem is purchases outside the EU, and the UK is outside. They deceive us at customs, they charge us VAT and also "customs management fees", where they can add 50% of what it cost. We can only buy if they manage the VAT in advance and include the IOSS in the shipping invoice.

 

[ArmorAlley]

Try max. His adapters are good.
If he doesn't have any, I'll have a look for one of mine. If I find one that works with an 80-pin drive (and terminates it too), you are welcome to it. I prefer the SD-card based drives (ZuluSCSI, SCSI2SD and so on) anyway. I live in Switzerland.

 

[ArmorAlley]

Yes, there is a jumper for it, but no actual termination on the PCB. The sellers mis-sell them.

Only a small number do.

Ah, I did not know this.
This explains trouble I have had in the past.
Thanks for this.

 

[indibil]

Try max. His adapters are good.
If he doesn't have any, I'll have a look for one of mine. If I find one that works with an 80-pin drive (and terminates it too), you are welcome to it. I prefer the SD-card based drives (ZuluSCSI, SCSI2SD and so on) anyway. I live in Switzerland.

Thanks for your answer!!! Does MAX have an online store or does it sell here on the forum?

How is termination indicated on a SCSI bus? Does the device do it or is it applied to the cable?

I bought the adapter from Aliexpress but it will take a few weeks to arrive. I would like to see and try the MAX one, if it were possible to manage the IOSS in shipping.

 

[GRudolf94]

Termination is only applied at the ends of the bus - the last device, or past it, and at the host. For Wide devices on a Narrow bus, the unused byte must also be terminated, and this is where 99% of adapters fail, as @Phipli mentioned way up in the thread.

It's not "indicated" so much as it is visible as a physical characteristic - be it a terminator dangling at the end of the cable, a termination enable jumper, etc (note that termination enable is different from a jumper to supply termination power).

 

[ArmorAlley]

Thanks for your answer!!! Does MAX have an online store or does it sell here on the forum?

Max is @max1zzz on these fora.
Send him a private message (PM) and ask him.