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zero-based bits dammit (fix kaypro keyboard bell) (nw)

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This commit is contained in:
Vas Crabb 2017-10-30 16:25:22 +11:00
parent e0bb6680d0
commit ab79685b45
1 changed files with 6 additions and 5 deletions
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11
src/mame/machine/kay_kbd.cpp
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@ -71,7 +71,7 @@ P1 is connected to the key matrix columns.
P2.1, P2.2 and P2.3 are CTRL, CAPS LOCK, and SHIFT inputs.
P2.6 drives the speaker (1.5625kHz tone generated using timer/counter).
P2.5 drives the speaker (1.5625kHz tone generated using timer/counter).
P2.7 is the serial data output to the host.
@ -99,9 +99,10 @@ due to bugs it omits the first byte of each page (0x000, 0x100, 0x200,
The serial command processing is quite lax in what it accepts:
xxxx xxx1 ignored
xxxx xx10 short beep
xxxx x100 long beep
xxx1 x000 answer back with 0xAA?
xxxx Mx10 short beep, set keyclick mute to M
xxxx M100 long beep, set keyclick mute to M
xxx1 M000 answer back with 0xAA?, set keyclick mute to M
xxx0 M000 set keyclick mute to M
The Kaypro II was sold with a different keyboard using an 8751 (MCS-51)
MCU, but we don't have a dump for it.
@ -406,7 +407,7 @@ WRITE8_MEMBER(kaypro_10_keyboard_device::p2_w)
}
}
m_bell->level_w(BIT(data, 6));
m_bell->level_w(BIT(data, 5));
m_rxd_cb(BIT(data, 7));
}