New Saturn asm "add loop" benchmark for the HP48G

[brouhaha]

[Possibly memory controller behavior. The memory controller is not well doscribed in any public documentation, but it matches the 4-bit Satun bus to 8-bit memory, and depending on the memory access pattern can introdue delays. Perhaps a tight loop is a case where that happens.

You might try unrolling the loop a bit, perhaps by putting two or four increments consecutively, and see whether the overhead is lower.