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a5200: Fix keypad scanning

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This commit is contained in:
AJR 2023-10-02 22:04:08 -04:00
parent 0d9eaa46ff
commit e22d8e8ad6
1 changed files with 3 additions and 6 deletions
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9
src/mame/atari/atari400_m.cpp
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@ -108,8 +108,9 @@ POKEY_KEYBOARD_CB_MEMBER(atari_common_state::a800_keyboard)
x10 |Pause| 6 | 5 | 4 |
x11 |Start| 3 | 2 | 1 |
K0 & K5 are ignored (we send them as 1, see the code below where
we pass "(atari_code << 1) | 0x21" )
K0 & K5 are ignored. Ignoring K5 doubles the rate at which the
matrix is scanned, and ignoring K0 allows the POKEY to register
keypresses with "debounce" mode disabled.
To Do: investigate implementation of KR2 to read accurately the
secondary Fire button (primary read through GTIA).
@ -138,10 +139,6 @@ POKEY_KEYBOARD_CB_MEMBER(atari_common_state::a5200_keypads)
}
/* decode regular key */
/* if kr5 and kr0 not set just return */
if ((k543210 & 0x21) != 0x21)
return ret;
k543210 = (k543210 >> 1) & 0x0f;
/* return on BREAK key now! */