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PDP1, PDP10, PDP11, ID16, ID32, NOVA, VAX: 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 07:09:20 -07:00
parent 580b388917
commit 4313f9fe3c
12 changed files with 120 additions and 11 deletions
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5
PDP11/pdp11_lp.c
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@@ -189,6 +189,7 @@ t_stat lpt_attach (UNIT *uptr, CONST char *cptr)
t_stat reason;
lpt_csr = lpt_csr & ~CSR_ERR;
sim_switches |= SWMASK('A');
reason = attach_unit (uptr, cptr);
if ((lpt_unit.flags & UNIT_ATT) == 0)
lpt_csr = lpt_csr | CSR_ERR;
@@ -206,7 +207,9 @@ t_stat lpt_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cpt
fprintf (st, "Line Printer (LPT)\n\n");
fprintf (st, "The line printer (LPT) writes data to a disk file. The POS register specifies\n");
fprintf (st, "the number of the next data item to be written. Thus, by changing POS, the\n");
fprintf (st, "user can backspace or advance the printer.\n");
fprintf (st, "user can backspace or advance the printer.\n\n");
fprintf (st, "The default position after ATTACH is to position at the end of an existing file.\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);

4
PDP11/pdp11_pt.c
View File

@@ -406,7 +406,9 @@ t_stat ptp_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cpt
fprintf (st, "PC11 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, "POS, the user can backspace or advance the punch.\n\n");
fprintf (st, "The default position after ATTACH is to position at the end of an existing file.\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);