I'd suggest leaving the needed signal points for the 64MB memory hack handy (TH machine pin). I have personally replaced the A3000's ZIP RAM socket zone with the 16MB DRAM PCB on machine pin headers, and honestly, a PCB that has the GAL (for the different memory matrix type, and/or additional addressing) and space for 64MB of SMC DRAM on it is the better solution if one is going to just max the memory and be done with it. When building such, one leaves the sockets off the motherboard and the 64MB (or larger) memory PCB is inserted into them and also to the (proposed) spare address lines. It can sit safely below any accelerator on simple machine pin header pins (soldered in). This would minimize the need to go additional layers, too.
i really like this project and as other people said i'd like to build one of those one day. So do you have considered to sell the boards and/or some motherboards kits or to pubblicly distribute the schemes and the bill of materials, firmware and what's needed to build one of those by our self?
I will be selling only blank PCBs and provide the BOM, firmware, etc. so people can assemble the boards themselves.
Thanks for the input, much appreciated. The plan is to add 112MB Fast RAM hack to the rev 2.0 without additional boards but do you guys know if these hacks (64MB or 112MB) have incompatibility issues with some hardware or software? Either I could hardwire the hack to the board or make it toggleable via a jumper.
As the latest picture I posted, the board is quite dense with traces so adding more features to the board will require more space than what I can get with 4 layers using the current form factor. I'd rather do a board that has all planned features integrated on the motherboard itself than adding features with extra boards.
Hello.
I wanted to find out about this project.
I hope it is doing well.
Is the production board near its release date?
Also, is this the main project site?
I look to buy one this or next year.
Congratulations.