Finally after 7 years I have an Original Macintosh, mostly:)

[mcdermd]

He didn't keep that - you have it.

 

[Paralel]

ROMs are copyrighted, correct? Well, that means it eventually expires. Especially if it was before a certain date where there was a change in the copyright law regarding ROM contents. If Apple failed to register their ROM contents before that date, they're already in the public domain. Even if they did register them, the copyright will still expire at some point (or possibly already has? [if Apple failed to file for the necessary extensions periodically under the law])

I was really surprised when I heard about the copyright law change in the 80's and that ROMs before that date needed to be registered otherwise they were in the public domain. This happened to Roland with the MT-32 ROMs. Turns out they were made before the copyright law and Roland failed to register them. As such, they are now in the public domain. We'd probably be surprised at how many ROMs from the 80's are actually in the public domain because companies failed to register their pre-copyright law ROMs according to the law. I'm sure that is the case for the Twiggy ROMs, they absolutely predate the copyright law, and I doubt Apple ever registered them, so they are in the public domain.

 

[uniserver]

I had to change the network filter twice, the first time, I must have over heated it with the heat gun removing it from the donor board, or it was just bad.

Not only did the internal floppy not work after the first replacement network filter, but the external was also not working. The second filter, gave the same issue as the original 128k filter. (Bum internal) - fully working external port.

Good news is my issue with the internal floppy port.

- its not the drive

- its not the network filter

- its not the floppy cable

- its not the ROM's

 

[Paralel]

With those 4 possibilities ruled out, what else could it be?

 

[uniserver]

i think mcdermd thinks i am nutts.

But i think its either the IWM, Witch i have no idea how the internal and external ports hook up to the IWM,

could be a resistor / cap / diode?

beats me…

the funny thing is with the plus board in, its internal floppy port runs the drive just fine.

So I doubt it could be an issue with the psu.

 

[mcdermd]

The only reason I think you're nuts is that I tested it in a 512k chassis with a 400k drive and original cable and it was good to go. I guess it's not entirely inconceivable that something could have gone bad in the mean time. I do know my 400k Macs (128k and 512k) are some of the pickiest I've had in regard to good floppies created with the right version of Disk Copy on System 6 with the right drive and cable blah, blah, blah. They're cranky.

 

[uniserver]

i knew you thought i was nutts

 

[uniserver]

wow looking here looks like i need to change the other filter? this schematic shows 2.\



http://www.kiramek.com/21test95/EarlyMacSchematics.pdf ( special thanks to JDW )

 

[uniserver]

looks like it shares with the mouse… Ok then

 

[uniserver]

basically a chain of events that occurred making me think it was something more complex then what it was due to my lack of experience with the 128k 512k plus .... Floppy drives and floppy cables.

One thing I do know after an hour of going back and forth online with MCD at like 2 am EST. I decided to make a cable. What I did was cut a chunk from wire 9 and wire 20.

The other thing i had to do is remove my 800k drive that was in there because something had some how gone terribly wrong with it.

Apparently when you upgraded a 128k or a 512k to a 800k drive back in the day, the kit included a new floppy cable(yellow stripe) as well as all the other stuff, Rom, Drive etc.

If anyone downgrades the floppy drive back to a 400k drive you have to install the original floppy cable(red stripe).

Additionally, in my case, my 128k was upgraded to a plus.

For whatever reasons instead of changing the floppy cable. They just made a change to the floppy drive its self to ignore pin 9 and 20.

ok and all is well as long as you are running a plus main-board with that floppy drive.

if you slap your 128k or 512k board back in there once you have downgraded your plus, and you do not also change the floppy drive back to 400k

( OR ) cut wires 9 and 20. Bad things will happen to the 800k floppy drive, if you run it like that over a short period of time.

As long as you cut wires 9 and 20 of a red striped cable or find a yellow striped floppy cable. The 800k drive in there will still work great as a 400k drive in the 128k or 512k.

**Later 800k floppy drives such as the ones in the SE, would still need pin 9 and 20 cut in the floppy cable in order to use it in a plus.



also good news is i have replaced both network filters.



EDIT:

TO MAKE A LONG STORY SHORT. IF YOU ARE GOING TO RUN AN 800K FLOPPY DRIVE IN A 512K OR 128K, JUST MAKE SURE THE FLOPPY CABLE HAS A YELLOW STRIPE ( NOT RED ) AND YOU CAN USE YOUR 800K FLOPPY DRIVE , WILL WORK AS 400K DIRVE NO PROBLEM. OR IF YOUR CABLE HAS A RED STRIPE, MAKE SURE TO CUT WIRES 9 AND 20, EMULATING A YELLOW STRIPED CABLE.

 

[onlyonemac]

And did it work?

 

[Paralel]

Excellent information, despite the fact that it cute the life of your 800k drive short :-/

Also, is the reverse detrimental to a 400k drive? (Running a 400k drive on a red stripe cable?)

 

[Macdrone]

I am glad I suggested the cable. I knew I was good for something.

 

[mcdermd]

Yeah, I don't think I explained myself to him well enough at 6:30AM yesterday.

There is more on the floppy drive cable issues here: viewtopic.php?f=7&t=19242&p=181869&hilit=400k+cable#p181869

 

[uniserver]

Yeah internal drive now works, boots up using that 800k drive. MacOS 2.0

 

[Trash80toHP_Mini]

I'm glad I waited until now to try to parse this thread.

I've been trying to reboot my technical lobe, it's been offline for a few months now. |)