[sdiy] Buchla 295 10-band comb filter topology

[Neil Johnson]

Hi Tom,

> There's *always* an advantage to having *everything* be a power-of-two!

Maybe in software, but not in hardware.

> If you're coding from binary, going to Octal or Hexadecimal makes sense. That gives you either 6-bit or 8-bit for a two-digit number, so seven bits is neither one thing or the other. Eight bits is a neat 0x00 to 0xFF.

9-bit memory was for 8 data bits and 1 parity bit.  The parity bit was
generated, checked and flagged in hardware.  Nowadays we have ECC RAM
with many more bits outside of the "data", and able to detect and
correct several bit errors.

If you look at NAND flash you have a sizeable chunk of OOB (out of
band) bits on each row to hold the ECC data.

Neil