IIe or not IIe, that is the question!

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Joined: Jul 30 2011
Posts: 86

Sorry about the title chaps, couldn't resist it!

The question is valid though, I have two IIe machines but only one of them will run ProDOS. The other states it will only run on an 'enhanced IIe'. I read that the 'e' referred to the enhanced model but ProDOS is looking for an enhanced enhanced computer!

What are the essential differences between these and is it possible to upgrade one to the other (by way of ROM replacement) or am I looking at a motherboard swap?

Cheers,

Richard.

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Dog Cow's picture
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Joined: Dec 11 2008
Posts: 461
Re: IIe or not IIe, that is the question!

Briefly:
- the enhanced IIe contains a 65C02 microprocessor
- updated ROM with new Applesoft and improved IRQ support, among others
- MouseText

Apple sold a 65C02 enhancement kit the consisted of a new microprocessor, system ROM, and video ROM.

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Joined: Jul 30 2011
Posts: 86
Re: IIe or not IIe, that is the question!

Thanks for that,

That does not seem to much to upgrade, I suppose I could burn an updated ROM (If I ever find out how to use my ROM burning card!)and I'm sure I could source the processor, otherwise a motherboard swap could be a simpler solution.

Cherrs,

Richard

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Joined: Nov 20 2007
Posts: 5
Re: IIe or not IIe, that is the question!

The earlier versions of ProDOS (I think up to version 1.9 ?) ran without the enhancement or 128k. I use it on my Apple ][+ with no issues.

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Joined: Apr 11 2006
Posts: 1013
Re: IIe or not IIe, that is the question!

bugman wrote:

The earlier versions of ProDOS (I think up to version 1.9 ?) ran without the enhancement or 128k. I use it on my Apple ][+ with no issues.

Exactly. You're probably booting 2.0.3; just boot 1.9 and you'll be fine. You'll lose some neat capabilities for SmartPorts, but if you only have one or two disk drives... it doesn't make a bit of difference.

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Joined: Jul 30 2011
Posts: 86
Re: IIe or not IIe, that is the question!

That's great Guys, Thanks.

I guess the hardware can stay as it is for a while.

gsmcten's picture
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Joined: Oct 4 2005
Posts: 2609
Re: IIe or not IIe, that is the question!

Richard,

Apple used to sell the "IIe Upgrade Kit" long ago that turned a regular IIe into the enhanced IIe. They are kind of hard to come by now.

I have one sitting on the shelf for a IIe upgrade project, brand new, sealed in the box.

Although there is another source for these kits: Reactive Micro

http://www.reactivemicro.com/

has them for $25.00 plus S&H

They are under new management and are closed for the rest of this year, but are supposed to open for business again in January,2012.

It would be worth waiting until then to get a kit.

Steven Smile

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Joined: Jul 30 2011
Posts: 86
Re: IIe or not IIe, that is the question!

Superb website Mate, look forward to them trading again.

Thanks,

Richard.

woogie's picture
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Joined: Dec 20 2003
Posts: 267
Re: IIe or not IIe, that is the question!

Comment:

Lots easier to just change out a few socketed
ICs than try to source another motherboard!
Plus you have the old ICs as spares in event that
something fails. Just saying.

Changeout is less than 5 minutes of work and
does not require any other dismantling other
than opening the case top for access.

Motherboard swaps require complete dismantling
of the machine and re-installing all of the cards,
etc.

Just saying....

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