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Update sms.md

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@ -16,7 +16,7 @@ the original iteration of the SN76489 used in the TI-99/4A computer, the SN94624
# chip flags
## SN7 versions
SN7 was extremely popular due to low-cost. Therefore, it was cloned and copied to no end, often with minor differences between each other. Furnace supports several of these:
SN7 was extremely popular due to low cost. Therefore, it was cloned and copied to no end, often with minor differences between each other. Furnace supports several of these:
- SN94624, can only produce tones as low as 100Hz, and is clocked at 447 KHz.
- SN76494, which can play notes as low as 13.670 Hz (A -1). It has a different noise feedback and invert masks.
- SN76489, identical to SN94624, just without a clock divider
@ -26,6 +26,6 @@ SN7 was extremely popular due to low-cost. Therefore, it was cloned and copied t
- Sega Master System VDP version has a different, characteristic noise LFSR.
- Game Gear SN7, identical to the above, but with stereo
- NCR8496, different noise invert masks
- PSSJ3, literally identical to the former, it justs swaps "high" and "low" signals in the output, which results in no audible difference
- PSSJ3, literally identical to the former, it just swaps "high" and "low" signals in the output, which results in no audible difference
TODO: all these checkboxes