Notes For V2.9-11

1. New Features

1.1 GRI-909

- This is a new simulator for the GRI-909.
- It has been hand-tested; so far, no software has been discovered.

1.2 VAX

- SET CPU CONHALT will cause a HALT instruction to return to the
  boot ROM console rather than to SIMH.  SET CPU SIMHALT restores
  the default behavior.
- BRB/W self at IPL 1F stops the simulator.  This is the default
  behavior of VMS at exit.

1.3 PDP-18b

- ATTACH -A PTR/PTP attaches the reader and punch in ASCII mode.
  In ASCII mode, the reader automatically sets the high order bit
  of incoming alphabetic data, and the punch clears the high order
  bit of outgoing data.

1.4 SCP

- DO -V echoes commands from the file as they are executed.
- Under Windows, execution priority is set BELOW_NORMAL when the
  simulator is running.

2. Release Notes

2.1 Bugs Fixed

- PDP-11 CPU: fixed updating of MMR0 on a memory management error.
- VAX FPA: changed function names to avoid conflict with C math library.
- 1401 MT: read end of record generates group mark without word mark.
- 1401 DP: fixed address generation and checking.
- SCP: an EXIT within a DO command will cause the simulator to exit.

3. In Progress

- Interdata 16b/32b: coded, not tested.
- SDS 940: coded, not tested.
- IBM 1620: coded, not tested.

If you would like to help with the debugging of the untested simulators,
they can be made available by special request.

PDP10/pdp10_tim.c

@@ -1,6 +1,6 @@
 /* pdp10_tim.c: PDP-10 tim subsystem simulator
 
-   Copyright (c) 1993-2001, Robert M Supnik
+   Copyright (c) 1993-2002, Robert M Supnik
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
@@ -25,6 +25,7 @@
 
    tim		timer subsystem
 
+   06-Jan-02	RMS	Added enable/disable support
    02-Dec-01	RMS	Fixed bug in ITS PC sampling (found by Dave Conroy)
    31-Aug-01	RMS	Changed int64 to t_int64 for Windoze
    17-Jul-01	RMS	Moved function prototype
@@ -54,6 +55,8 @@ d10 quant = 0;						/* ITS quantum */
 int32 diagflg = 0;					/* diagnostics? */
 int32 tmxr_poll = TIM_DELAY * DZ_MULT;			/* term mux poll */
 
+t_stat tcu_rd (int32 *data, int32 PA, int32 access);
+extern t_stat wr_nop (int32 data, int32 PA, int32 access);
 t_stat tim_svc (UNIT *uptr);
 t_stat tim_reset (DEVICE *dptr);
 extern d10 Read (a10 ea, int32 prv);
@@ -69,6 +72,8 @@ extern int32 pi_eval (void);
    tim_reg	TIM register list
 */
 
+DIB tcu_dib = { 1, IOBA_TCU, IOLN_TCU, &tcu_rd, &wr_nop };
+
 UNIT tim_unit = { UDATA (&tim_svc, 0, 0), TIM_DELAY };
 
 REG tim_reg[] = {
@@ -84,6 +89,12 @@ REG tim_reg[] = {
 MTAB tim_mod[] = {
 	{ UNIT_Y2K, 0, "non Y2K OS", "NOY2K", NULL },
 	{ UNIT_Y2K, UNIT_Y2K, "Y2K OS", "Y2K", NULL },
+	{ MTAB_XTD|MTAB_VDV, 000, "ADDRESS", NULL,
+		NULL, &show_addr, &tcu_dib },
+	{ MTAB_XTD|MTAB_VDV, 1, NULL, "ENABLED",
+		&set_enbdis, NULL, &tcu_dib },
+	{ MTAB_XTD|MTAB_VDV, 0, NULL, "DISABLED",
+		&set_enbdis, NULL, &tcu_dib },
 	{ 0 }  };
 
 DEVICE tim_dev = {