From http://www.maushammer.com/vmu.html

The last two undocumented opcodes are $50 and $51, and I'm going to
tentatively name them LDF and STF (email me if you have a better name, these
aren't supported in the assembler). The $50 instruction reads the flash
memory and works like an LDC except that it doesn't add ACC to the address.
The 17th address bit is taken from SFR $154. Opcode $51 writes the flash,
but it has a safeguard which makes it a bit more difficult to use.


----- Original Message -----
From: "Michel Gerritse" <michel_gerritse@...>
To: <vmu-dev@yahoogroups.com>
Sent: Tuesday, October 01, 2002 1:02 AM
Subject: [vmu] Potato missing opcodes


> - Does anyone has information of opcodes 0x50 and 0x51 ?? The Sega VMU
> Hardware manual doesn't have a description of them (probably because they
> are only used by the bios).
>
> - Are the indirect (@Rj) byte opcodes always related to RamBank0 ?? No
> matter what the value of the RAMBK0 flag is ??
>
> - Also, does someone has Sega binaries, so I can test my POTATO core even
> more ??
>
> Thanks in advance,
>
> Gerrie
>
>
>
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