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ISYS8020: Created iSBC80-20.c file

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This commit is contained in:
Bill Beech 2015-05-08 15:34:01 -07:00
parent 06f9cbe41d
commit 7dc9c86846
1 changed files with 38 additions and 34 deletions
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20
Intel-Systems/common/iSBC80-20.c
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@ -1,4 +1,4 @@
/* iSBC80-20.c: Intel iSBC 80/30 Processor simulator
/* iSBC80-20.c: Intel iSBC 80/20 Processor simulator
Copyright (c) 2010, William A. Beech
@ -23,10 +23,10 @@
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from William A. Beech.
NOTES:
This software was written by Bill Beech, Dec 2010, to allow emulation of Multibus
Computer Systems.
?? ??? 10 - Original file.
*/
#include "system_defs.h"
@ -102,10 +102,12 @@ int32 get_mbyte(int32 addr)
int32 val, org, len;
/* if local EPROM handle it */
if ((i8255_unit.u6 & 0x01) && (addr >= EPROM_unit.u3) && (addr < (EPROM_unit.u3 + EPROM_unit.capac))) {
if ((i8255_unit.u6 & 0x01) && /* EPROM enabled? */
(addr >= EPROM_unit.u3) && (addr < (EPROM_unit.u3 + EPROM_unit.capac))) {
return EPROM_get_mbyte(addr);
} /* if local RAM handle it */
if ((i8255_unit.u6 & 0x02) && (addr >= RAM_unit.u3) && (addr < (RAM_unit.u3 + RAM_unit.capac))) {
if ((i8255_unit.u6 & 0x02) && /* local RAM enabled? */
(addr >= RAM_unit.u3) && (addr < (RAM_unit.u3 + RAM_unit.capac))) {
return RAM_get_mbyte(addr);
} /* otherwise, try the multibus */
return multibus_get_mbyte(addr);
@ -127,11 +129,13 @@ int32 get_mword(int32 addr)
void put_mbyte(int32 addr, int32 val)
{
/* if local EPROM handle it */
if ((i8255_unit.u6 & 0x01) && (addr >= EPROM_unit.u3) && (addr <= (EPROM_unit.u3 + EPROM_unit.capac))) {
if ((i8255_unit.u6 & 0x01) && /* EPROM enabled? */
(addr >= EPROM_unit.u3) && (addr <= (EPROM_unit.u3 + EPROM_unit.capac))) {
sim_printf("Write to R/O memory address %04X - ignored\n", addr);
return;
} /* if local RAM handle it */
if ((i8255_unit.u6 & 0x02) && (addr >= RAM_unit.u3) && (addr <= (RAM_unit.u3 + RAM_unit.capac))) {
if ((i8255_unit.u6 & 0x02) && /* local RAM enabled? */
(addr >= RAM_unit.u3) && (addr <= (RAM_unit.u3 + RAM_unit.capac))) {
RAM_put_mbyte(addr, val);
return;
} /* otherwise, try the multibus */
@ -146,4 +150,4 @@ void put_mword(int32 addr, int32 val)
put_mbyte(addr+1, val >> 8);
}
/* end of iSBC80-10.c */
/* end of iSBC80-20.c */