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1. fix hello.pal (in noncpu)
2. fix hello.pal (in multipdp8) (it only sees bytes with the lowest bit set)
+-----------+
+-----| Arbiter 1 |<--------------------------------------------+
| +-----------+ |
| ^ |
v | |
+--------+ +----------------+ +----------------+ +----------------+
| UART 0 |-->| Command Parser |-----+ | Off-chip DRAM | | Result Printer |
+--------+ +----------------+ | +----------------+ +----------------+
| ^ | ^
| | v |
+--------+ +-------+ | +----------------+ |
| UART 1 |-->| PDP-8 | v | RAM Controller | |
+--------+ +-------+ +-----------+ +----------------+ +-------------+
| Cache |--------->| Arbiter 2 |-->| Another Cache |-->| Broadcaster |
+-------+ +-----------+ +----------------+ +-------------+
^ |
| |
+-------------------------------------------------------------+
Arbiter 1: Trivial priority arbiter
Arbiter 2: Adds clog2(1 + number of PDP-8s) tag bits indicating which channel was selected
For inputs coming from a PDP-8 as opposed to the command parser, add the appropriate prefix to the memory address
Broadcaster: Removes clog2(1 + number of PDP-8s) tag bits to determine which channel to send to
For outputs going to a PDP-8 as opposed to the result printer, strip excess address bits
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