Diodes-Matrix as ROM memory

In principle, Memory (RAM/ROM) should not be placed in the CPU Unit; a dedicated unit should be used instead. The "problem" here is that, using today's technologies, Memory will fits comfortable in a single card, so placing that only card in a unit would be a waste. I'm aware of that I'm seeking a justification to make things primitive and inconvenient, but I really wish to make my computer to look similar to those of the 70's.

So making a primitive, bulky ROM Memory with diodes has no other objective but to justify the use of a dedicated Memory Unit. It would be a card full of diodes; it could be "programmed" via jumpers: one jumper for each matrix node. The card would also contain decoders, buffers and some other logic.

This kind of memory would be perfect for storing a "Loader" (bootstrap) program so the operator don't have to enter it from the Control Panel switches. Diagnostic programs would also fit. I could even interchange different programs by just interchanging cards. It would be fun.

I will seriously consider this idea among others... such as using magnetic tapes as storage !