Oeka Kids tablet: Difference between revisions
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The Oeka Kids tablet is a Famicom accessory from Bandai that resembles a drawing tablet, and plugs into the expansion port. There are two known games that use this peripheral, using [[iNES Mapper 096]], both of which contain a variety of activities, such as painting, drawing lessons, hiragana lessons, and a variety of minigames such as mazes and sliding puzzles. | |||
Very little information about this accessory is available, and only [http://forums.nesdev.org/viewtopic.php?p=19454#19454 basic reverse engineering] has been performed so far. As such, this information '''may be incorrect''', but it seems to be acceptable for the two commercial games that use it. | |||
=== Input ($4016 write) === | === Input ($4016 write) === | ||
| Line 7: | Line 9: | ||
xxxx xxAS | xxxx xxAS | ||
|| | || | ||
|+- Strobe (0 = Latch, 1 = Read | |+- Strobe (0 = Latch, 1 = Read mode) | ||
+-- Advance to next bit | +-- Advance to next bit | ||
Bits can be read only while S is 1. It advances to the next bit when S is 1 and A transitions from 0 to 1. | |||
=== Output ($4017 read) === | === Output ($4017 read) === | ||
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7 bit 0 | 7 bit 0 | ||
---- ---- | ---- ---- | ||
xxxx | xxxx DSxx | ||
|| | |||
|+-- 0 if strobe is 1, 1 otherwise. | |||
+--- (Inverted) Serial data if strobe is 1, 0 if strobe is 0. | |||
The serial data is returned ''most significant bit first'', and inverted. | The serial data is returned ''most significant bit first'', and inverted (including the touch and click bits). | ||
$4017.2 | $4017.2 | ||
| Line 32: | Line 34: | ||
||||||||++++++++--- Stylus Y, scaled to 0-255 | ||||||||++++++++--- Stylus Y, scaled to 0-255 | ||
++++++++----------- Stylus X, scaled to 0-239 | ++++++++----------- Stylus X, scaled to 0-239 | ||
The fact that X and Y are scaled backwards is ''not'' an error - the games which use this mapper rescale the coordinates by multiplying X by 256/240 and multiplying Y by 240/256. | |||
[[Category:Controllers]] | |||
[[Category:Pointing devices]] | |||
Latest revision as of 04:35, 6 March 2022
The Oeka Kids tablet is a Famicom accessory from Bandai that resembles a drawing tablet, and plugs into the expansion port. There are two known games that use this peripheral, using iNES Mapper 096, both of which contain a variety of activities, such as painting, drawing lessons, hiragana lessons, and a variety of minigames such as mazes and sliding puzzles.
Very little information about this accessory is available, and only basic reverse engineering has been performed so far. As such, this information may be incorrect, but it seems to be acceptable for the two commercial games that use it.
Input ($4016 write)
7 bit 0
---- ----
xxxx xxAS
||
|+- Strobe (0 = Latch, 1 = Read mode)
+-- Advance to next bit
Bits can be read only while S is 1. It advances to the next bit when S is 1 and A transitions from 0 to 1.
Output ($4017 read)
7 bit 0
---- ----
xxxx DSxx
||
|+-- 0 if strobe is 1, 1 otherwise.
+--- (Inverted) Serial data if strobe is 1, 0 if strobe is 0.
The serial data is returned most significant bit first, and inverted (including the touch and click bits).
$4017.2 ^ | <-- <-- <-- <-- XXXXXXXXYYYYYYYYBA |||||||||||||||||| |||||||||||||||||+- Click ||||||||||||||||+-- Stylus is touching tablet ||||||||++++++++--- Stylus Y, scaled to 0-255 ++++++++----------- Stylus X, scaled to 0-239
The fact that X and Y are scaled backwards is not an error - the games which use this mapper rescale the coordinates by multiplying X by 256/240 and multiplying Y by 240/256.
