Yes, CS8900 is a better lan controller but it is not old enough for me
The IDP bus has an interesting complexity.
It needs a fsm, so it needs a CPLD/FPGA
it needs a PLL
it has a lot of signals to be handled, 32bit address, 32bit data, spare other lines, no less than ~75 signals to be routed
it needs a connector of 3x32=96pins
it needs to be designed with signals @ 25Mhz
etc
so the PCB goes complex (especially if you want to support the burst mode)
I am afraid EagleCAD is not powerful enough to realize it, and I am afraid 2 layers are not enough.
I asked a senior, he answered that
Altium is suggested, with no less than 4 layers.
So, in order to realize a PCB, I'd better reduce features into different boards (one board will be ethernet only, one board will be NVRAM only, etc) and on each board everything is simplified in order to reduce the complexity.
For example, the CS8900 chip is 8bit data line, Olimex has kits, embedded modules with the RJ45 + filter + transfer. It's just ready out of the box, you just need to wire it, while the AM79C90 chip is 16bit data line, and I can't find kits, so I will require more work in order to achieve a working ethernet module.
hobby-constraints are needed in order to achieve the purpose in terms of hobby resources (equipment, CAD licenses, budget, and time)
Yes, I'm interested by a 68K gdb-stub, but I'm not in a hurry because for now I don't have spare time
me too, but I am scheduling time slots.
I have two sub projects scheduled, the gdb-stub, and a new debug TAP I am developing for a SoftCore.
assigned priorities:
high - to my debug protocol and TAP (which is composed by C source for both linux and metalbare (e.g. 68k), and VHDL for fpga)
low - to gdb-stub (it's only C/metalbare)
XRAY+ and pROBE+ are highly integrated
…
available through Motorola.
I don't think we will find all of these equipments and tools, perhaps we will find something, but I am afraid it will take a lot of time, also a lot of time to understand, what is missing, what is not.