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Commits on Sep 24, 2016
Commits on Sep 21, 2016
  1. SCP: Allow range/count specifier to special last value reference ($) …

    …in EXAMINE
    
    As discussed in #343
    markpizz committed Sep 21, 2016
Commits on Sep 20, 2016
Commits on Sep 15, 2016
Commits on Sep 14, 2016
  1. SCP: Fix throttling to provide reasonable operation of calibrated clocks

    - Generate reasonable messages when presented with erroneous throttle input.
    - Add throttling recalibration logic if only if target rate drift exceeds 5%
    markpizz committed Sep 14, 2016
Commits on Sep 13, 2016
  1. PDP11: Add new breakpoint types for data and physical address

    Add support for physical and virtual address variants for the existing
    instruction (PC) breakpoint, and add memory read and memory write
    breakpoints.
    Paul Koning committed Sep 13, 2016
Commits on Sep 11, 2016
  1. SCP: Fix default breakpoint message format.

    When sim_brk_type_desc isn't populated, the matching breakpoint switches
    and matching address are displayed.  Fix to use the optional VM provided
    address formatting function sim_vm_sprint_addr.
    markpizz committed Sep 11, 2016
Commits on Sep 9, 2016
  1. DOC: More detail on breakpoints and instruction replay

    Add discussion of the recommended handling of instruction history
    recording.  Also recommendations for read and write breakpoints to
    cover cases such as I/O registers.
    Paul Koning committed Sep 9, 2016
Commits on Sep 1, 2016
  1. SCP: Add sim_brk_message() to facilitate easy reporting of matched br…

    …eakpoints.
    
    Also extended the optional VM supplied routines to include sim_vm_sprint_addr.
    Simulators which provide sim_vm_fprint_addr should also provide
    sim_vm_sprint_addr with sim_vm_fprint_addr reworked to leverage
    sim_vm_sprint_addr internally.  sim_vm_sprint_addr is currently only used by
    sim_brk_message() which is an API which a simulator may choose to use if
    it supports multiple breakpoint types,
    markpizz committed Sep 1, 2016
Commits on Aug 31, 2016
  1. SCP: Record breakpoint match details in globals

    sim_brk_match_type and sim_brk_match_addr can be used to generate
    appropriate messages relating to the breakpoint match.
    markpizz committed Aug 31, 2016
  2. SCP: Breakpoint enhancements

    - Reliable support for multiple breakpoint types
    - Optional separate breakpoint types defined concurrently with the same address
    markpizz committed Aug 31, 2016
Commits on Aug 30, 2016
Commits on Aug 29, 2016
  1. PDP10, PDP11, VAX: Make DMC/DMR initialization more accurate.

    These changes cure a number of issues in RSTS/E, which is more
    sensitive to details of emulation than most:
    
    1. Additional KMC opcodes supported for ROMI
    2. MCLR now initializes the CSRs per the spec
    3. MCLR and ROMI are processed immediately at CSR write rather than
       being deferred, because these actions are implemented in the device
       hardware rather than in the microprogram.
    Paul Koning committed Aug 29, 2016
Commits on Aug 28, 2016
Commits on Aug 26, 2016
  1. SCP: Breakpoint cleanup.

     - Add detailed error message info while parsing breakpoint commands
     - Properly limit breakpoint class values to reflect available mask bits
     - Declare globally sim_brk_npc since it is a documented API
     - Revise simh_breakpoints.doc to reflect current behavior
    markpizz committed Aug 26, 2016
Commits on Aug 25, 2016
  1. PDP11: Move history entry pointer initialization out of instruction l…

    …oop.
    
    This will be slightly more efficient for the normal case where history isn't
    being recorded.
    markpizz committed Aug 25, 2016
  2. PDP11: Record the actual source and destination values for history.

    Previously, the history would always use a register value as source or
    destination as if the mode were zero, even when it wasn't.  Also, now
    the destination value reflects the destination after instruction
    execution rather than before.
    Paul Koning committed with markpizz Apr 7, 2016
Commits on Aug 24, 2016
Commits on Aug 18, 2016
  1. PDP11: Reworked PCLK device to minimize scheduled events

    Rather than use a simh event to increment/decrement the counter register
    for each 'clock cycle', compute the time the interrupt will eventually fire
    and schedule a single event to deal with that.  If the clock counter is
    referenced before the interrupt fires, interpolate the value based on the
    number of instructions that have actually been executed.
    
    sim_activate_after() is used here, and the time value for the scheduled
    activation is a uint32 representing microseconds.  The range of values
    that the PCLK can programmatically specify could be large enough
    to exceed an uint32 when number of microseconds is converted to
    a count of instructions.  This is an issue that has minimal consequences,
    but should be addressed internal to the implementation of
    sim_activate_after().
    markpizz committed Aug 18, 2016
Commits on Aug 13, 2016
  1. HP2100: Latest updates from Dave Bryan

    273. ENHANCEMENT:  Burst-fill only the first of two MPX receive buffers in FASTTIME mode.
    
         OBSERVATION:  When the 8-channel multiplexer is set for "optimized timing"
         mode, buffered characters are transferred in blocks to and from the Telnet
         connection.  That is, the line service routine will send or receive
         characters as long as they are available.  This is more efficient than the
         "realistic timing" mode, which sends or receives one character per service
         invocation.  Effectively, this means that up to 508 characters (two buffers
         of 254 bytes each) may be sent or received between one CPU instruction or
         DCPC cycle and the next.  This works well for sending, but it can cause
         buffer overflows when receiving.
    
         Consider an application (such as Kermit) that receives large blocks of data
         at high speed from a client.  The multiplexer is designed to handle this
         condition by interrupting the CPU when the first buffer is filled and
         filling the second buffer while the CPU is unloading data from the first.
         In realistic mode at 19,200 baud, the CPU has approximately 800
         instructions or DCPC cycles available per character received.  With a
         second buffer of 254 bytes, the CPU has approximately 203,000 instructions
         available to unload the first buffer after receiving the interrupt
         notification.  Once started, the DCPC transfer takes no more than 508
         instruction times, so the CPU can easily keep up with data arriving at the
         maximum baud rate.
    
         In fast timing mode, however, the first buffer burst-fills in a single CPU
         instruction time, and, if available from the Telnet connection, the second
         buffer fills in the next instruction time.  At that point, any additional
         characters received will result in a buffer overflow condition.  The
         problem is that the CPU has no time between the first burst and the second
         to empty the first buffer.
    
         RESOLUTION:  Modify "mpx_line_svc" (hp2100_mpx.c) to shift from burst
         transfers to character-at-a-time transfers when a receive buffer is full
         and awaiting unloading by the CPU.  This allows the CPU and DCPC time to
         read the buffer contents into memory before the second multiplexer buffer
         is full.  Once the completed buffer is freed, the service routine returns
         to burst mode to fill the remainder of the other buffer, permitting the
         efficiency of block transfers while avoiding buffer overruns with large
         data transfers.
    
    274. PROBLEM:  A second connection to the BACI device leaves the client unresponsive.
    
          OBSERVATION:  The BACI device supports a single terminal client connection.
         If a second connection is attempted, the client connects but is otherwise
         unresponsive.  It would be better if the client received the "All
         connections busy" message that is reported by the terminal multiplexers
         (MPX and MUX devices) when the number of connections is exceeded.
    
         CAUSE:  The "baci_poll_svc" is calling the "tmxr_poll_conn" routine only if
         the port is not connected.  The routine should be called unilaterally, so
         that it will report an error and disconnect the client when all lines are
         in use and another connection is attempted.
    
         RESOLUTION:  Modify "baci_poll_svc" (hp2100_baci.c) to call
         "tmxr_poll_conn" unconditionally, so that a second concurrent connection
         attempt will be rejected with "All connections busy".
    
    275. PROBLEM:  The exported program counter name (PC) clashes with other libraries.
    
         OBSERVATION:  In HP 21xx/1000 systems, the P register is the program
         counter.  In keeping with the naming of the other register variables (e.g.,
         for A register, B register, etc.) in the simulator, the variable used
         should be named "PR".  However, for traditional reasons, the program
         counter in SIMH is named "PC".
    
         The main CPU module declares its hardware register variables as global, so
         that they may be accessed by other CPU helper modules.  Unfortunately, the
         "curses" library also declares the symbol "PC" as global, leading to
         conflicts when it is loaded by SCP.  A workaround had been implemented that
         renamed "PC" to "PC_Global" in the HP2100 simulator, but that meant that
         the new name had to be used when debugging, which was awkward.
    
         CAUSE:  A poor choice of global symbol names from the "termcap" library,
         which was inherited by the "curses" library.
    
         RESOLUTION:  Change the program counter variable name from "PC" to "PR"
         (hp2100_cpu.c, hp2100_cpu1.c, hp2100_cpu2.c, hp2100_cpu3.c, hp2100_cpu4.c,
         hp2100_cpu5.c, hp2100_cpu6.c, hp2100_cpu7.c, hp2100_dr.c, and hp2100_ipl.c)
         to avoid a name clash and for register naming consistency.
    markpizz committed Aug 13, 2016
Commits on Aug 12, 2016
  1. ETHER: Removed references to pcap_get_servicename since that API won'…

    …t exist
    
    Early versions of Npcap for Windows added pcap_get_servicename, but this
    code was dropped when the latest libpcap codebase was merged into Npcap.
    markpizz committed Aug 12, 2016