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Only return 012345 for tty (bus).

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folkert van heusden 2022-06-12 21:25:11 +02:00
parent 6e17f4b747
commit 93e7af7705
1 changed files with 5 additions and 5 deletions
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10
bus.cpp
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@ -59,9 +59,6 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev,
if (word_mode)
DOLOG(debug, false, "READ I/O %06o in byte mode", a);
if (peek_only)
return 012345;
if (a == 0177750) { // MAINT
DOLOG(debug, !peek_only, "read MAINT");
return 1; // POWER OK
@ -258,8 +255,12 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev,
if (rl02_ && a >= RL02_BASE && a < RL02_END)
return word_mode ? rl02_ -> readByte(a) : rl02_ -> readWord(a);
if (tty_ && a >= PDP11TTY_BASE && a < PDP11TTY_END)
if (tty_ && a >= PDP11TTY_BASE && a < PDP11TTY_END) {
if (peek_only)
return 012345;
return word_mode ? tty_ -> readByte(a) : tty_ -> readWord(a);
}
// LO size register field must be all 1s, so subtract 1
const uint32_t system_size = n_pages * 8192 / 64 - 1;
@ -375,7 +376,6 @@ uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, c
}
else {
m_offset = a;
DOLOG(debug, !peek_only, "virtual address %06o maps to physical address %08o", a, m_offset);
}
return m_offset;