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Apple II ROMS

H

Holmes

Experienced Member
Joined
Dec 13, 2010
Messages
340
Location
Marietta, GA
I've just come into possession of an Apple II with integer ROMs, and looking at the ROMs, the printing on the tops looks different from most of the ones I've seen online. They don't have "Apple" written anywhere on them like most I've seen, so I was wondering if anyone could tell me about them. Are they bootlegs since they don't have "Apple" printed on top? They don't have the regular "341-000X-00" part numbers.

I tried to do an internet search for any info, but couldn't find anything.

The ROMs have the following:

ROM F8: 7750D C38012 A1MB-F8
ROM F0: 7751D C38011 A1MB-F0
ROM E8: 7750E C38010 A1MB-E8
ROM E0: 7751E C38009 A1MB-E0
ROM D8: (empty)
ROM D0: 7851E C48050 341-0016 00 (c) 78 D0

Here's a picture:
Apple Integer ROMs.jpg

I've noticed most of the chips begin with "77XX" - could that mean 1977?

The startup screen is also a bit different (thick vertical bars) and not the normal ??'s and @@'s.

Any thoughts?
 
OK, thanks.

I'm not worried about anything, since the computer seems to work great. It looked like a more unique set of ROMs to me, so I was just wondering if there was any additional info out there. I was also wondering if this was part of the reason for the different start-up screen.

I looked on apple2online.com and found two diagnostic disk images out there. One is version 4.1, but that image looks like it's for a 3.5" floppy (800KB). There's another that looks like it's for a II+, so I'll try that. I also found the Master Diagnostics for IIe, but not sure if it will work - at least it's 140KB so I'll try it.
 
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I've got several of those ROM Boards with various markings on the chips. Some are AMI, some Signetics (like yours) with date codes in the 1977/1978 range (yours are from the end of 1977, mostly.

All, however, have Apple copyrights on them.

Either way, if they boot to integer BASIC I wouldn't worry... I'm guessing that Apple had numerous sources and these were all marked differently.
 
Erik said:
I've got several of those ROM Boards with various markings on the chips. Some are AMI, some Signetics (like yours) with date codes in the 1977/1978 range (yours are from the end of 1977, mostly.
Click to expand...

You meant Synertek and typed Signetics instead. :)
 
Ah, okay. I had heard that the startup screen was just what was in uninitialized memory before reset, so that makes sense.

Cool, so they are early chips. I actually like this, and like that they don't have Apple on them, since it makes them a bit more unique. As long as they're not illegal bootlegs, I'm cool with it.

Thanks everyone!
 
MarkO_ said:
SpeedyG on Apple Fritter has a whole Web Site, Apple Box, dedicated to Apple I and II Technical Information. Some is still in German..

Here is the page for Apple II Chipsets ( ROM's and Other Logic ).

MarkO
Click to expand...

Hey Mark,

I am looking at a couple of Apple II's on eBay, including the one that is currently priced at 30K.
It has unusual ROMs here are the ROM numbers and the 34100xx they represent.

He also mentioned that he had to change ROMs as the originals were corroded.


7917E - C48037 3410004-00 Apple78 F8
7912E - C48079 3410003 Apple78 F0
7916E - C48078 3410002-00 Apple78 E8
7912E - C48077 3410001 Apple78 E0
7916E - C48050 3410016-00 Apple78 D0

There is another Apple II with these ROM chips

C28080M, C28079, C28078 and C38009

It boots to Integer Basic
 
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I was researching the topic of early Apple II ROM Part Number the other day and this thread was helpful. Looks like the link above is dead so here's that page in the Wayback Machine...
And a PDF attached for archival purposes.
 

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