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KA10, KI10, KL10: Open LPT, PTP devices for append

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This implements the principle of "least surprise", in that users won't
normally expect to start overwriting an existing file on these devices.
Real hardware didn't behave that way.  A new (empty) file can always
be created with the -N switch on the ATTACH.
This commit is contained in:
Mark Pizzolato 2020-04-28 14:35:22 -07:00
parent 6e6706f2a4
commit 3c081a80c1
2 changed files with 3 additions and 0 deletions
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1
PDP10/kx10_lp.c
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@ -393,6 +393,7 @@ t_stat lpt_attach (UNIT *uptr, CONST char *cptr)
{
t_stat reason;
sim_switches |= SWMASK ('A'); /* Position to EOF */
reason = attach_unit (uptr, cptr);
if (sim_switches & SIM_SW_REST)
return reason;

2
PDP10/kx10_pt.c
View file

@ -209,6 +209,7 @@ t_stat ptp_attach (UNIT *uptr, CONST char *cptr)
{
t_stat reason;
sim_switches |= SWMASK ('A'); /* Default to Append to existing file */
reason = attach_unit (uptr, cptr);
uptr->STATUS &= ~NO_TAPE_PP;
return reason;
@ -409,6 +410,7 @@ fprintf (st, "Paper Tape Punch (PTP)\n\n");
fprintf (st, "The paper tape punch (PTP) writes data to a disk file. The POS register\n");
fprintf (st, "specifies the number of the next data item to be written. Thus, by changing\n");
fprintf (st, "POS, the user can backspace or advance the punch.\n");
fprintf (st, "A new file can be created if you attach with the -N switch\n\n");
fprint_set_help (st, dptr);
fprint_show_help (st, dptr);
fprint_reg_help (st, dptr);