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WonderSwan compatibility patches [message #6730]

Sun, 26 June 2022 08:29

asie [PM]

Hello. As part of working on a WonderSwan homebrew toolchain, I've decided to patch up Mednafen a little as I implement various elements of the hardware.

Today, I'd like to present a draft patch for improving the quality of EEPROM emulation by:

fixing the internal EEPROM size to 0x80 bytes (WS) and 0x800 bytes (WSC), as well as correcting the ability to read owner information by WSC-mode games (this is broken as of latest release),
actually emulating the EEPROM transfer protocol, complete with at least some of its quirks,
properly initializing more IPL-maintained fields (including the WSC-exclusive config field), as opposed to relying on a shaky dump.

The patch also fixes handling of the color/packed/4bpp flags to match real hardware.

.patch file available here (v2). Testing welcome!

[Updated on: Sun, 26 June 2022 10:26]

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Re: WonderSwan compatibility patches [message #6896 is a reply to message #6730 ]

Tue, 11 July 2023 16:14

asie [PM]

More patches:

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Re: WonderSwan compatibility patches [message #6932 is a reply to message #6896 ]

Sun, 03 September 2023 01:47

asie [PM]

wswan: Implement sound DMA "hold" (bit 2), fix offset/length port write behaviour.

Test ROMs available for the AAM/AAD fix and the sound DMA fix above here.

[Updated on: Sun, 03 September 2023 01:48]

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