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task: don't zero parent_psp on 0x26

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Patch ported from
  * f49252ac6b
See
  * https://github.com/dosemu2/fdpp/issues/112
  * https://github.com/FDOS/kernel/issues/38
This commit is contained in:
Tee-Kiah Chia 2021-07-28 17:13:44 +00:00 committed by Kenneth J Davis
parent 858934f152
commit de7f0d6489
1 changed files with 5 additions and 0 deletions
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5
kernel/task.c
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@ -224,8 +224,13 @@ void new_psp(seg para, seg cur_psp)
p->ps_isv23 = getvec(0x23);
/* critical error address */
p->ps_isv24 = getvec(0x24);
/* RBIL is wrong on zeroing parent_psp, and in fact some
* progs (Alpha Waves game, https://github.com/stsp/fdpp/issues/112)
* won't work if its zeroed. */
#if 0
/* parent psp segment set to 0 (see RBIL int21/ah=26) */
p->ps_parent = 0;
#endif
/* default system version for int21/ah=30 */
p->ps_retdosver = (os_setver_minor << 8) + os_setver_major;
}