terryfi wrote on 2022-04-06, 21:08:
1- When I search Digikey for 311-20ARCT-ND and 311-2.2ARCT-ND part numbers, it finds parts with 20ohm and 2.2ohm instead of 20Kohm and 2.2Kohm resistor shown in BOM, are the part numbers wrong or there are typos in values?
When in doubt, forget all of the existing carts and/or part numbers posted (most are not quite complete), and refer back to the original documents posted by shock__. The values listed there are correct, and you would do well to make sure any other lists match what he originally called for.
terryfi wrote on 2022-04-06, 21:08:
2- Is M29F800FB55M3F2 good replacement for IW78C21M1?
As others have mentioned, the IW78C21M1 contains the 1 MiB instrument bank, consisting of parameters, other metadata and (mostly) 8-bit linear PCM samples (forget any other nonsense you may have read on Wikipedia). The data are not in the public domain, and nobody here has the authority to distribute them. The only way that is not known to be in violation of their copyrights is to acquire the original masked ROM. Whether they'd actually be inclined to take legal action is another matter (at least two of the three companies still exist). Any other parts mentioned are flash memory ICs, contain no data, and will produce no sound with software designed to use the on-board bank.
terryfi wrote on 2022-04-06, 21:08:
3- As others also mentioned the 16Mhz oscillator with exact value 16.9344 MHz is out of stock in Digikey, if we use 16.00 Mhz oscillator instead, will the card work? If yes, what would be side effect, slightly higher pitch sound?
Tiido has given you the answer to this one. If you're going to bother trying to build the card, it's not worth trying to substitute a part that is that far out of specifications. At best, you will get sound that plays at the wrong pitch. Since the InterWave can be sensitive to timing, other things may begin to fail (timers, MIDI data rate, etc.), and the chip may even stop responding outright. Do yourself a favour and use the right parts.