Apple II Motherboard ID

[westcoastech]

Hi guys

I was hoping someone could help ID a few motherboards, these are two separate boards I am looking at and I want to make sure they are Apple II and not Apple II+ motherboards. I need to get a secondary board to swap ICs between my current board. My current board is an Apple II from 1978.

Here is the first board (first three pictures). The second board are the last two pictures.

Thanks guys.

 

[bear]

The first one is a II+ board. The bottom one has the characteristics of a II board, but some went into II+es so without seeing more details I don't think anybody can say that it definitely didn't come out of a II+.

In either case, I don't know why it matters. If chip swapping is your aim, the vast majority of them are identical between the II and II+.

 

[Elfen]

Like Bear said, the top is an Apple II+ board, the bottom is an Apple II. The boards are nearly identical, it is the ROM and the date tag that tell you but its a late model Apple II.

The chip you show activates the 16K bank that is missing on the Apple II board. Also 2 of your ROMs D8 and D0 are missing on the Apple II. It might load up in Integer BASIC but I do not know, I do not think so. 

 

[snuci]

As mentioned above, the first board is a Rev 7 RFI motherboard used in the Apple II+.  The second board looks like an earlier Rev 4 motherboard that was probably used in an Apple II+ also.  Earlier versions of this board had green slots and were in both the Apple II and Apple II+.  There is a possibility this board was used in an Apple II as well but the serial number label really makes that determination on late Apple II/early Apple II+ computers, so let's call it an Apple II board   In any case, your goal is to replace chips so they will be the same if the Rev level is the same.  If they're not the same rev level, just check the chip identifiers.

You can remove the CPU on the second board to double check the Rev number if you're curious.

Hope this helps.

 

[westcoastech]

Here is my motherboard in my Apple II, I wasn't able to find the part number, maybe its under the keyboard part. My board has different slots, they have a little flange at the end opposed to be straight like the others.

I am not sure if one board would be better than the other, if you guys could tell me what board or if both boards would work to swap chips between. I would have to buy one of the boards, the first board I could get a lot cheaper than the second. Thanks

 

[westcoastech]

Hey guys

im wondering what you think about this board, im guessing its a II+?

http://www.ebay.com/itm/Original-1979-Apple-II-Motherboard-/351403760285?pt=LH_DefaultDomain_0&hash=item51d14bda9d

So basically you are saying if I want to swap chips between the two I would need to find the same revision board? Or would I be able to use a II+ board to swap chips between my II. Sorry I don't have any real experience messing with the Apple II series computers.

 

[raoulduke]

http://umich.edu/~archive/apple2/misc/hardware/motherboard.ii.txt

It's an Apple ][ board revision RFI (or revision D of the RFI variant, maybe - not sure exactly how to phrase that).