diff --git a/src/devices/cpu/rsp/rspdrc.cpp b/src/devices/cpu/rsp/rspdrc.cpp
index 34204110139..c384c94eb54 100644
--- a/src/devices/cpu/rsp/rspdrc.cpp
+++ b/src/devices/cpu/rsp/rspdrc.cpp
@@ -671,7 +671,7 @@ void rsp_device::generate_checksum_block(drcuml_block *block, compiler_state *co
 
 			if (seqhead->delay.first() != nullptr && seqhead->physpc != seqhead->delay.first()->physpc)
 			{
-				base = m_direct->read_ptr(seqhead->delay.first()->physpc | 0x1000);
+				base = m_direct->read_ptr((seqhead->delay.first()->physpc & 0x00000fff) | 0x1000);
 				assert(base != nullptr);
 				UML_LOAD(block, I1, base, 0, SIZE_DWORD, SCALE_x4);                 // load    i1,base,dword
 				UML_ADD(block, I0, I0, I1);                     // add     i0,i0,i1
@@ -702,7 +702,7 @@ void rsp_device::generate_checksum_block(drcuml_block *block, compiler_state *co
 
 				if (curdesc->delay.first() != nullptr && (curdesc == seqlast || (curdesc->next() != nullptr && curdesc->next()->physpc != curdesc->delay.first()->physpc)))
 				{
-					base = m_direct->read_ptr(curdesc->delay.first()->physpc | 0x1000);
+					base = m_direct->read_ptr((curdesc->delay.first()->physpc & 0x00000fff) | 0x1000);
 					assert(base != nullptr);
 					UML_LOAD(block, I1, base, 0, SIZE_DWORD, SCALE_x4);                 // load    i1,base,dword
 					UML_ADD(block, I0, I0, I1);                     // add     i0,i0,i1
@@ -813,7 +813,7 @@ void rsp_device::generate_delay_slot_and_branch(drcuml_block *block, compiler_st
 	/* set the link if needed -- before the delay slot */
 	if (linkreg != 0)
 	{
-		UML_MOV(block, R32(linkreg), (int32_t)(desc->pc + 8));                    // mov    <linkreg>,desc->pc + 8
+		UML_MOV(block, R32(linkreg), (int32_t)((desc->pc + 8) & 0x0000fff));                    // mov    <linkreg>,desc->pc + 8
 	}
 
 	/* compile the delay slot using temporary compiler state */
diff --git a/src/devices/cpu/rsp/rspfe.cpp b/src/devices/cpu/rsp/rspfe.cpp
index c86ed6f5298..5bbf6c94c2e 100644
--- a/src/devices/cpu/rsp/rspfe.cpp
+++ b/src/devices/cpu/rsp/rspfe.cpp
@@ -37,7 +37,7 @@ bool rsp_frontend::describe(opcode_desc &desc, const opcode_desc *prev)
 	uint32_t op, opswitch;
 
 	// fetch the opcode
-	op = desc.opptr.l[0] = m_rsp.m_direct->read_dword(desc.physpc | 0x1000);
+	op = desc.opptr.l[0] = m_rsp.m_direct->read_dword((desc.physpc & 0x00000fff) | 0x1000);
 
 	// all instructions are 4 bytes and default to a single cycle each
 	desc.length = 4;