EPROM Copy of Macintosh 512K ROMS 64KB

[Mikemike690]

Does anyone on here have EPROM copies of Macintosh 512K 64KB ROMs? Thanks.

 

[360alaska]

You can always buy this guy:http://www.bigmessowires.com/mac-rom-inator/

 

[Mikemike690]

Wow thank you!

 

[techknight]

Sadly ill never have time, but I wanted to hack a Plus to run a Superdrive FDHD. Patching the .Sony driver from an SE into the Plus ROMs, and swapping the IWM. 

 

[Elfen]

That would be a kick-ass +Plus!

 

[Mikemike690]

So you mean like a modern SuperDrive as in DVD/CD drive?!

 

[Elfen]

1.44 HD Floppy Drives.

 

[Mikemike690]

Don't mind my idiocy

 

[Paralel]

Yeah, the 1.44 HD Floppy Drives were the very first "SuperDrive" from Apple in the Mac line.

 

[trag]

Don't mind my idiocy

Not your fault that Apple reuses the same only tired marketing terms for different products.

 

[bigmessowires]

Sadly ill never have time, but I wanted to hack a Plus to run a Superdrive FDHD. Patching the .Sony driver from an SE into the Plus ROMs, and swapping the IWM. 

That's a really interesting idea. Do you know offhand if the SWIM is pin-compatible with the IWM? I think it's not, so some kind of adapter board would be needed.

 

[trag]

It's a socketed replacement in the SE and Mac II. i.e., they sold 800K floppy equipped IIs and SEs which were later upgradeable to 1.44 floppy operation by swapping the IWM for a SWIM and changing the ROM chips.

That suggests that the two are pin compatible, unless the SWIM has more pins and the two Macs were built with a longer socket with upgrades in mind, but that seems unlikely.

 

[Elfen]

As I remember, the SIWM and IWM chips are same size and same pin outs. They should fit the Plus without problems or modifications. It is the ROMs that determine how to read a disk from the S\IWM.

The question is - do you lose the ability to read 400K MFS disks and are stuck with 800K/1.4M HSF disks?

 

[CC_333]

No, the SWIM is capable of working with 400k drives in addition to 800k/1.44MB.

And the ability to work with MFS is somewhat dependent on the SSW (SSW 6 or earlier is best for MFS compatibility).

c

 

[techknight]

That's a really interesting idea. Do you know offhand if the SWIM is pin-compatible with the IWM? I think it's not, so some kind of adapter board would be needed.

I cant recall if the Plus and SE are identical, but I think they are. I know SWIM and IWM can be swapped around in the SE. and if I am not mistaking, the SE carried the same chip as the Plus did. 

So, in theory, swapping for a SWIM And doing the necessary ROM changes it would work fine.