GameShark SP not supported?

[ArmadstheDoom]

Summary

//: # So I do not know if this is a bug on my end, a lack of feature that's been added, or if this is an innate problem with the emulator, so I will explain my reasoning and confusion, as I've not found anything via googling it or looking through the problems that are open or closed here.

I know that 'gameshark' as it was known was actually a bunch of things, however I have had no problem using it in bizhawk for gbc games, and I've not had issue with the codes in other emulators that use the same cores. To test this I downloaded retroarch with the mGBA core, and they worked.

The test codes I used for this were for Fire Emblem: The Sacred Stones. The two master codes are these:
00006777000A
10001BE00007
These follow the pretty standard 8 and 4 formula, so I figured they should be accepted. But I get an error when I try to use them, and as I said, I have no idea if that error is because I'm actually trying to use a feature that doesn't exist, I'm making a mistake that causes it, or there's something else going on. Again, I tried googling the error itself, tried googling fixes for it, and I looked through the open and closed threads, and it doesn't seem like anyone else is having these issues or maybe I'm clueless.

So I'm not sure if this is a feature request or a bug/error; I'm not someone who knows too much about vram editing beyond the extreme basics. I know the converter works for gbc games, so I assumed it was just me making a mistake. Is this something that is fixable or is this an emulator feature request?

Repro

1. open a gba game.
2. attempt to convert a 'gameshark' code using the code converter
3. have error message repeated as many times as you have lines in the box

Output

'codebreaker/gameshark sp/xploder codes are not yet supported'

Host env.

• BizHawk 2.9.1 windows 10 x64

[YoshiRulz]

This is one of our clearer error messages! A converter for that kind of code hasn't been written. See #1367 (comment) for a workaround Seems to be a different format from Codebreaker, so maybe we shouldn't be grouping them together. I had a quick look and wasn't able to find any docs for GameShark SP. Worst case, someone can copy from mGBA, RetroArch, or OpenEmu, whichever has the most comments :P

Calling this a duplicate of #897.