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Cory5412

MacSD - new SCSI SD card emulation tool

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9 hours ago, dcr said:

But, the other possibility I am wondering about is if they were able to do an online configuration tool.

It has crossed my mind.  The problem of incorrectly entering filenames, etc remains.  I'll add more to the documentation about partitions.  For now, here's an example:

 

[2:hdd]        ; Map SCSI ID 2 to MBR partition 4
partition=4

 

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8 hours ago, ymk said:

The problem of incorrectly entering filenames, etc remains.

You have that problem manually doing the .ini file too.  But, in the case of an online configuration tool, you can put up a big bold red (or whatever) warning to double-check the filenames before submitting.

 

8 hours ago, ymk said:

I'll add more to the documentation about partitions.

Cool.  Thanks!  Though, in my case, I'd most likely have a pretty basic setup.  I'm just throwing ideas out there to hopefully make it easier for people who want to use those other options but still want relative simplicity.

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13 hours ago, Cory5412 said:

However, doing so does, in fact, kind of negate the (at least implicit, but I believe this has been stated) benefit of the MacSD relative to the other extant options, which is that configuration and operation are simple

This is not "SCSI2SD for dummies".  If features I add to this product conflict with what you think it is or should be, you are mistaken.  Most of my customers already had a SCSI to SD solution.

 

13 hours ago, Cory5412 said:

But in terms of pigeonholing the MacSD as a "Mac" product, well: 

I've sold to non-Mac users and will continue to.  Don't concern yourself with it.

 

13 hours ago, Cory5412 said:

I don't intend to steer potential customers away from your product, but in a meta-discussion about extant SCSI hard disk replacement options, it's worth considering the properties of each solution and how those properties become pros and cons.

That discussion is best led by people who have actually used the device, or at least bothered to read the documentation before speculating.

 

I'll let you know about a vendor account.

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On 9/20/2020 at 12:31 PM, Cory5412 said:

With regard to >4GB images, I'm curious what the demand for that is like. Only '040 Macs will officially run volumes over 4GB,

 

I'm curious about this. Apple says that 7.5.2+ supports up to 2TiB. Is their KB article an error?

 

On 9/20/2020 at 4:03 AM, ymk said:

Any color LED can be used, however current is only around 1mA so I recommend using a modern, high intensity type.  Brightness will be adjustable through the config file.

 

If I'm not seriously mistaken, a typical T1-3/4 LED, red, uses about 20mA when operating on a 100% duty cycle (or...just on). I don't have it immediately available but if I'm recalling correctly green, blue and especially white require more to reach full brightness. Now the LEDs used in 1989 were not particularly bright, and were probably not driven at full power either, but I couldn't help but notice that 1mA is probably barely enough to forward-bias the LED.

Edited by Mk.558

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8 hours ago, Mk.558 said:

If I'm not seriously mistaken, a typical T1-3/4 LED, red, uses about 20mA when operating on a 100% duty cycle (or...just on). I don't have it immediately available but if I'm recalling correctly green, blue and especially white require more to reach full brightness. Now the LEDs used in 1989 were not particularly bright, and were probably not driven at full power either, but I couldn't help but notice that 1mA is probably barely enough to forward-bias the LED.

 

You are mostly correct.  I would not say an LED uses 20mA, but that it tolerates that current.  It emits light with far less current, but as you've mentioned, a 1989 LED is less efficient than what is available today.  The LED code was overhauled for v0.8.0.  Maximum external LED drive is 3.3v through a 220 Ohm resistor at 9.7% duty cycle.

Edited by ymk

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8 hours ago, Mk.558 said:

I'm curious about this. Apple says that 7.5.2+ supports up to 2TiB. Is their KB article an error?

 

Doing so requires SCSI Manager 4.3, which is present in the '040 Macs. I don't know about 7.5 in particular, although 7.6 has been seen doing 2TB with SATA cards. There's, uh, no real reason why you couldn't do the same with 7.5, although I'll admit I'd personally rather run 7.6.1 on any PCI PowerMac that'll run it than 7.5.

 

Here's another overview:

 

So, SCSI Manager 4.3 on an '040 Mac is, as far as I can tell, required for above-4GB volumes. I've seen some discussion about getting >4GB on '030s but I don't know where it went. This is some kind of hardware limitation because it applies even to 8.1, and of course because plain-HFS can itself go up to 2TB. (Just: the files will be very big if you make a 2TB plain HFS volume.)

 

I've heard varying reports of the stability of big volumes in 7.5.2, but 7.5.3 or 7.5.5 should do it fine.

 

11 hours ago, ymk said:

That discussion is best led by people who have actually used the device, or at least bothered to read the documentation before speculating.

 

I'm excited to hear more from them.

 

Over the past several years, we've seen several different round-ups on the available options. One that Fizzbin wrote a year ago is linked in the lead post to this thread. I'm sure it won't be long until someone who has a few of the different devices posts another write-up or round of benchmarks.

 

11 hours ago, ymk said:

I'll let you know about a vendor account.

 

I'm coordinating with my co-admin to decide on where vendor accounts should "go". Announcements will be made if the policies change from what's currently on the rules page.

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On 9/30/2020 at 12:24 PM, Cory5412 said:

allow exfat as an alternative

Last time I looked, exfat was both patent-encumbered and very badly documented, and the possibilities for fragmentation sound painful.   I wouldn't personally want to implement it...

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15 hours ago, ymk said:

I've sold to non-Mac users and will continue to.  Don't concern yourself with it.

Well, given the way you've marketed it, at least on the web/eBay it's not an unreasonable assumption that it's quite tightly focussed.  If that isn't your intent, it might be good to tweak your prose slightly.  That said, I'm intending to test drive it in other SCSI-based machines (assuming I can reclaim my most interesting one from someone else's garage...) so at least in my case your marketing hasn't done much harm :-).

 

(Parenthetically, I do find it very interesting that "toy" is taken as a pejorative (not just here, in lots of places—this is not personal in the least!), rather than just a label for a way of using something.  In my Ludicrously Overengineered Home Network I have some exquisitely engineered electronics (and in one specific bit, optics).  Are they toys?  In my context, yup.  But they're such good toys precisely because they're so well-built.  Perhaps "luxury" is a less loaded term here, but I think it's such a shame that adults are so ashamed of wanting to play and learn that being told that one has made a good toy can feel like an insult...)

 

15 hours ago, ymk said:

That discussion is best led by people who have actually used the device

 

11 hours ago, Cory5412 said:

I'm excited to hear more from them.

Mine should be arriving today (?).  If my neurochemistry decides to behave next week I'm planning to do a comparison (I have scsi2sd v5 and v6 here to compare against).  Though, as I'm sure you're used to by now, my priorities are very much flexibility, ease of use and "having a quiet life" rather than raw performance, so while I will benchmark, if you want to do serious benchmark snooping you will probably have to talk someone else into it.  Given the documentation, I have high hopes :-).

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@ymk it just arrived safe and sound :-).  Looks really nice.  Impressed by the physical quality of it.  Won't have time to seriously play with it until next week, but wanted you to know it had got here.

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20 hours ago, cheesestraws said:

@ymk it just arrived safe and sound :-).  Looks really nice.  Impressed by the physical quality of it.  Won't have time to seriously play with it until next week, but wanted you to know it had got here.

Good to know you've received it.  :)

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On 9/30/2020 at 1:57 PM, tt said:

I am still observing some freezing which happens to be occurring with HyperCard across 3 different CD images, but I am not sure if its an image file issue or the hardware (MacSD or otherwise).

I had the same hard lockup running HyperCard from that image on my Centris 610 with System 7.5.5.  There were no SCSI faults.

 

I used the Centris to copy the contents of that CD image to a 2GB HDD image.  I then switched the boot drive in macsd.ini to Realitystorm's 6.0.8 image, put the card in my Classic and the stack ran fine.  It appears to be a software issue.

bmug.jpg

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On 10/1/2020 at 5:50 PM, cheesestraws said:

Last time I looked, exfat was both patent-encumbered and very badly documented, and the possibilities for fragmentation sound painful.   I wouldn't personally want to implement it... 

As of august of 2019, the situation has changed significantly, for the better: https://www.zdnet.com/article/microsoft-readies-exfat-patents-for-linux-and-open-source/

 

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This is a very cool device!  I put a MacHD in an external HD case so I can use it with my vintage Macs and IIgs.  I've got a RaSCSI too, for which the price is definitely right, but it's nice not having to wait for the Pi to boot up before you turn your computer on, and it's also nice to be able to hook up an HD activity light.

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16 hours ago, LaPorta said:

Question: how configurable is this thing via a modern Mac rather than a PC? How's it been going for everyone?

Everything is configurable by popping the MacSD's SD card into your modern computer and editing the macsd.ini text file, so no difference.  An SD extension cable is highly recommended...

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