Sharp MZ-800 - Page 152

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(6) Keyboard and data recorder controller (8255)
The MZ-800 uses an 8255 to control the keyboard and data recorder.
In the MZ-700 mode, memory mapped I/O addresses $E000 to $E003 are assigned to 8255 while in
the MZ-800 mode, I/O mapped addresses $D0 to $D3 are assigned.
$DO: Port A 4
PAO to PA3: KEYSTROBE signals (out) < A ge lt
PA4 to PAS: JOYSTROBE signals (out)
PA7: cursor RST (out) / te °
$D1: Port B
PBO to PB7: KEYDATA signals (in)
$D2: Port C
PCO: SOUND MASK (out) 2— Zev ada/t ore » fore
PC1: CMTWR (out) pr
PC2: disable INT (out) 0~ ~o4~ Jretresemece om swad
PC3: MOTOR (out) ¢ 0 6e pretence s - Care
PC4: SENSE (in) » ¢* s lod
PCS: CMTRD (in)
PC6: cursor FLSH (in) <*> A °
PC7: VBLNK (in) 2» ¢
$D3: Control register