From 3d21e9afe03c606fa7deeb2d377114fc392fcad2 Mon Sep 17 00:00:00 2001 From: Tim Allen Date: Mon, 23 Oct 2017 13:24:14 +1100 Subject: [PATCH] Mention that higan does not yet emulate the timing of the SGB2. --- docs/guides/import.md | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/docs/guides/import.md b/docs/guides/import.md index f3037a1c..e3a0efd9 100644 --- a/docs/guides/import.md +++ b/docs/guides/import.md @@ -407,17 +407,24 @@ released for the Super Famicom (and all its regional variants around the world) that allowed Game Boy games to be played via the Super Famicom's controllers and video output. -The Super Game Boy 2 was released in Japan, -and had some minor extra features -beyond the original Super Game Boy, -but importing and playing games -works the same way in higan. +The Super Game Boy does not emulate the Game Boy hardware, +it physically includes all the Game Boy components +so compatibility with Game Boy games is high. +However, the Super Game Boy drives the Game Boy hardware +from the Super Famicom's timing signals, which means +games play 2.4% faster than on a real Game Boy. -The Super Game Boy cartridge includes -the complete hardware of an original -(black-and-white) -Game Boy, -so it needs a boot ROM: +The Super Game Boy 2 was a Japan-only release +that fixed the timing problem of the original Super Game Boy, +and included a different set of default borders. +higan supports the Super Game Boy 2 base cartridge, +so you can use the extra borders, +but does not yet emulate the timing change +so games still play slightly too fast. + +Because the Super Game Boy cartridge includes +the original Game Boy hardware, +it needs a boot ROM: