Re: Apple II 'Super II' motherboard from 1981

[shoppa@alph02.triumf.ca (Tim Shoppa)]

In article <54ueur$jpt@darla.visi.com>, Nathan Mates <nathan@visi.com> wrote:
>   there's just too much wide open space. Also, all chips are socketed,
>   but that's to be expected for a prototype.

Don't forget that Apple's production machines in 1981 also had socketed
chips.

>   Identified as 'Video Conn.', there's a 60-pin slot left of the
>   processor. Not sure if this is the same number of pins as a //e's AUX
>   slot or whether only a few cards were made for this one.

Yes, a real //e's AUX slot has 60 contacts.

>   socket is white.] Also, a set of 4 pins in a row in the back right;
>   those might be for video connectons or something else.

Probably for a video modulator and/or PAL/SECAM adapters, as in the
II+.

>   There'a a set of 6 easy solder/cut points in the mid-right; X1 and X5
>   are connected, the rest are open.

Do these look like they're more closely connected to the clock logic
or the RAM decode logic?  I'm just extrapolating from my knowledge
of the II+ here:  As there are only 8 RAM sockets on the motherboard
and 256kbit DRAM wasn't even being sampled in '81, I doubt this is
for anything as fancy as allowing 256kbit memory.  It's probably
related to changing the video rates for PAL/SECAM.

Tim. (shoppa@triumf.ca)