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11/70 has only 8 bits for "microprogram break register"?

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folkert van heusden 2023-03-20 19:39:31 +01:00
parent 5bc706d979
commit 6cbb5c3faa
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 9 additions and 3 deletions
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12
bus.cpp
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@ -188,18 +188,20 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev,
return c -> getPSW() >> 8;
}
if (a == ADDR_STACKLIM) { // stack limit register
DOLOG(debug, !peek_only, "readb stack limit register");
DOLOG(debug, !peek_only, "readb stack limit register (low)");
return c -> getStackLimitRegister() & 0xff;
}
if (a == ADDR_STACKLIM + 1) { // stack limit register
DOLOG(debug, !peek_only, "readb stack limit register");
DOLOG(debug, !peek_only, "readb stack limit register (high)");
return c -> getStackLimitRegister() >> 8;
}
if (a == ADDR_MICROPROG_BREAK_REG) { // microprogram break register
DOLOG(debug, !peek_only, "readb micropgrogram break register (low: %03o)", microprogram_break_register & 255);
return microprogram_break_register & 255;
}
if (a == ADDR_MICROPROG_BREAK_REG + 1) { // microprogram break register
DOLOG(debug, !peek_only, "readb micropgrogram break register (high: %03o)", microprogram_break_register >> 8);
return microprogram_break_register >> 8;
}
}
@ -239,6 +241,7 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev,
}
if (a == ADDR_MICROPROG_BREAK_REG) { // microprogram break register
DOLOG(debug, !peek_only, "read micropgrogram break register (%06o)", microprogram_break_register);
return microprogram_break_register;
}
}
@ -618,10 +621,12 @@ void bus::write(const uint16_t a, const bool word_mode, uint16_t value, const bo
}
if (a == ADDR_MICROPROG_BREAK_REG) { // microprogram break register
DOLOG(debug, false, "writeb micropgrogram break register (low: %03o)", value);
microprogram_break_register = (microprogram_break_register & 0xff00) | value;
return;
}
if (a == ADDR_MICROPROG_BREAK_REG + 1) { // microprogram break register
DOLOG(debug, false, "writeb micropgrogram break register (high: %03o)", value);
microprogram_break_register = (microprogram_break_register & 0x00ff) | (value << 8);
return;
}
@ -671,7 +676,8 @@ void bus::write(const uint16_t a, const bool word_mode, uint16_t value, const bo
}
if (a == ADDR_MICROPROG_BREAK_REG) { // microprogram break register
microprogram_break_register = value;
DOLOG(debug, false, "write micropgrogram break register (%06o)", value);
microprogram_break_register = value & 0xff; // only 8b on 11/70?
return;
}
}