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-rw-r--r--src/devices/oprom/x86emu/ops.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/src/devices/oprom/x86emu/ops.c b/src/devices/oprom/x86emu/ops.c
index 536b4041b2..6917a08162 100644
--- a/src/devices/oprom/x86emu/ops.c
+++ b/src/devices/oprom/x86emu/ops.c
@@ -4301,16 +4301,25 @@ Handles opcode 0xe9
****************************************************************************/
static void x86emuOp_jump_near_IMM(u8 X86EMU_UNUSED(op1))
{
- int ip;
+ u32 ip;
START_OF_INSTR();
DECODE_PRINTF("JMP\t");
- ip = (s16)fetch_word_imm();
- ip += (s16)M.x86.R_IP;
- DECODE_PRINTF2("%04x\n", ip);
- JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, " NEAR ");
- TRACE_AND_STEP();
- M.x86.R_IP = (u16)ip;
+ if (M.x86.mode & SYSMODE_PREFIX_DATA) {
+ ip = (u32)fetch_long_imm();
+ ip += (u32)M.x86.R_EIP;
+ DECODE_PRINTF2("%08x\n", (u32)ip);
+ JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, " NEAR ");
+ TRACE_AND_STEP();
+ M.x86.R_EIP = (u32)ip;
+ } else {
+ ip = (s16)fetch_word_imm();
+ ip += (s16)M.x86.R_IP;
+ DECODE_PRINTF2("%04x\n", (u16)ip);
+ JMP_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, " NEAR ");
+ TRACE_AND_STEP();
+ M.x86.R_IP = (u16)ip;
+ }
DECODE_CLEAR_SEGOVR();
END_OF_INSTR();
}