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PDP11: Support byte write access to DHCSR.

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This fixes issue #201, using a fix proposed bu Bjoren Davis.
This commit is contained in:
Paul Koning 2023-03-29 20:07:26 -04:00
parent 27bd6b81aa
commit b0f69eea95
1 changed files with 11 additions and 0 deletions
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11
PDP11/pdp11_dh.c
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@ -191,6 +191,17 @@ dh_wr(int32 data, int32 PA, int32 access)
switch (PA & 017) {
case 000:
sim_debug (DBG_IO, &dh_dev, "WRITE DHSCR %06o\n", data);
if (access == WRITEB) {
/* Only writing one byte of "SCR" */
if ((PA & 1) == 0) {
/* Even byte offset */
data = (dh_scr & ~0377) | data;
}
else {
/* Odd byte offset */
data = (dh_scr & 0377) | (data << 8);
}
}
dh_scr = data;
if (data & MCLR)
dh_reset (&dh_dev);