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ISYS8020: Created iSBC80-20.c file

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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 Copyright (c) 2010, William A. Beech
@ -23,10 +23,10 @@
used in advertising or otherwise to promote the sale, use or other dealings used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from William A. Beech. 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 This software was written by Bill Beech, Dec 2010, to allow emulation of Multibus
Computer Systems. Computer Systems.
?? ??? 10 - Original file.
*/ */
#include "system_defs.h" #include "system_defs.h"
@ -102,10 +102,12 @@ int32 get_mbyte(int32 addr)
int32 val, org, len; int32 val, org, len;
/* if local EPROM handle it */ /* 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); return EPROM_get_mbyte(addr);
} /* if local RAM handle it */ } /* 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); return RAM_get_mbyte(addr);
} /* otherwise, try the multibus */ } /* otherwise, try the multibus */
return multibus_get_mbyte(addr); return multibus_get_mbyte(addr);
@ -127,11 +129,13 @@ int32 get_mword(int32 addr)
void put_mbyte(int32 addr, int32 val) void put_mbyte(int32 addr, int32 val)
{ {
/* if local EPROM handle it */ /* 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); sim_printf("Write to R/O memory address %04X - ignored\n", addr);
return; return;
} /* if local RAM handle it */ } /* 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); RAM_put_mbyte(addr, val);
return; return;
} /* otherwise, try the multibus */ } /* otherwise, try the multibus */
@ -146,4 +150,4 @@ void put_mword(int32 addr, int32 val)
put_mbyte(addr+1, val >> 8); put_mbyte(addr+1, val >> 8);
} }
/* end of iSBC80-10.c */ /* end of iSBC80-20.c */