Limits of 3B ECU (as opposed to ABY and/or AAN)

[ramkaz]

It looks I'm reviving a really old server lol. A little bit of introduction on my first post: I'm a college student who loves VW/Audi stuff, especially the 20v EA113 and 034 motors. In the span of 2 years, I (to my surprise) acquired cars that have each motor. I'm by no means an expert in old Audis, but I'm hoping to learn a lot. I'm not an idiot when it comes to car mechanics. I also have a technological background; I understand digital (and a bit of analog) electronics, as well as old microprocessors and assembly language (although I've never really got into Intel assembly or 8051 assembly for that matter).
Anyway, I picked up a '91 200Q with the 3B engine a few months ago. Needless to say, it's going to need a lot of work to get running again. In the meantime, I've been doing as much research as I can during my free time regarding modifications, especially information pertaining to the ECU. I found this site, m232.org, s2central.com, and even found some informational stuff on 034 which have all been great resources. One thing that I haven't been able to clearly find a straight answer for is what are the limitations of the 3B ECU?
After looking at the m232 schematic on prj's github repo, I soon realized that the schematic is slightly different than my ECU (btw: would anyone know where I could view/get the 3B specific schematic?). I understand that the ABY and AAN ECUs used coil-over-plug ignition, which explains some of the schematic differences, but was anything else modified from the 3B ECU to the ABY and AAN ECU hardware?
Thanks.

[newsh]

The ABY ECU runs faster processing and bigger EPROMs and is altogether more powerful.
You can your 3B fairly easily to the later ECU by doing the “Pin Swap” a search on here should bring up a thread with all you need to know. You can then if you wish go the M232 route and go speed density tuneable.

There was a 3B schematic on here a while ago, a search might bring it up. Probably posted by s2central.