diff --git a/l7801.lua b/l7801.lua
index dcf9988..677a6a1 100644
--- a/l7801.lua
+++ b/l7801.lua
@@ -41,10 +41,10 @@ local Keywords_7801 = {
     'aci','adi','adinc','ani','bit0','bit1','bit2','bit3',
     'bit4','bit5','bit6','bit7','block','calb','calf','call',
     'calt','clc','ei','eqi','eqiw','daa','di','dcr',
-    'dcrw','dcx','ex','exx','gti','halt','inr','inrw',
+    'dcrw','dcx','ex','exx','gti','halt','in','inr','inrw',
     'inx','jb','jmp','jr','jre','ldaw','ldax','ldaxd',
     'ldaxi','lti','lxi','mov','mvi','mviw','mvix','nei',
-    'nop','offi','oni','ori','pen','per','pex','pop','push','ret',
+    'nop','offi','oni','ori','out','pen','per','pex','pop','push','ret',
     'reti','rets','rld','rll','rlr','rrd','sbi','sio','skc',
     'skit','sknit','skz','sknc','sknz','sll','slr','softi',
     'staw','stax','staxd','staxi','stc','stm','sui','suinb',
@@ -80,7 +80,7 @@ local opcode_implied = lookupify{
     'stc','stm','table'
 }
 local opcode_immediate = lookupify{
-    'calf','calt','call','jmp',
+    'calf','calt','call','in','jmp','out',
 }
 local opcode_wa = lookupify{
     'inrw','ldaw','dcrw','staw',
@@ -1488,7 +1488,7 @@ local function ParseLua(src, src_name)
                         mod_st, mod_expr = ParseExpr(scope)
                         if not mod_st then return false, mod_expr end
                     end
-                    stat = emit_call{name=op, args={expr, mod_expr}, inverse_encapsulate=inverse_encapsulate, paren_open_white=paren_open_whites} break
+                    stat = emit_call{name=op .. 'imm', args={expr, mod_expr}, inverse_encapsulate=inverse_encapsulate, paren_open_white=paren_open_whites} break
                 end
                 if (opcode_wa[op] or opcode_wab[op] or opcode_reg_ind[op] or opcode_reg_ind_ex[op]) and tok:ConsumeSymbol('(', tokenList) then
                     local paren_open_whites,paren_close_whites = {},{}
diff --git a/samples/scv_test.l65 b/samples/scv_test.l65
index 1eba337..507573b 100644
--- a/samples/scv_test.l65
+++ b/samples/scv_test.l65
@@ -162,5 +162,11 @@ section{"rom", org=0x8000}
     sknit f1
     sknit f2
     sknit fs
-
+    in 0x00
+    in 0xa7
+    in 0xbf
+    out 0x00
+    out 0x5a
+    out 0xbf
+    
 writebin(filename .. '.bin')
\ No newline at end of file
diff --git a/uPD7801.lua b/uPD7801.lua
index f0274b1..09624df 100644
--- a/uPD7801.lua
+++ b/uPD7801.lua
@@ -162,12 +162,26 @@ end
 local opw = {
     call=M.op(0x44,16),
     jmp=M.op(0x54,10),
+} M.opw = opw
+for k,v in pairs(opw) do
+    M[k .. 'imm'] = function(late, early)
+        local l65dbg = { info=debug.getinfo(2, 'Sl'), trace=debug.traceback(nil, 1) }
+        local size = function() late,early = M.size_op(late,early) return 3 end
+        local bin = function() local l65dbg=l65dbg 
+            local x = M.op_eval_word(late,early)
+            return { v.opc, x&0xff, x>>8 }
+        end
+        table.insert(M.section_current.instructions, { size=size, cycles=v.cycles, bin=bin })
+    end
+end
+
+local opr16w = {
     lxisp=M.op(0x04,10),
     lxibc=M.op(0x14,10),
     lxide=M.op(0x24,10),
     lxihl=M.op(0x34,10)    
-} M.opw = opw
-for k,v in pairs(opw) do
+} M.opr16w = opr16w
+for k,v in pairs(opr16w) do
     M[k] = function(late, early)
         local l65dbg = { info=debug.getinfo(2, 'Sl'), trace=debug.traceback(nil, 1) }
         local size = function() late,early = M.size_op(late,early) return 3 end
@@ -179,7 +193,8 @@ for k,v in pairs(opw) do
     end
 end
 
-M.calt = function(late, early)
+
+M['calt' .. 'imm'] = function(late, early)
     local l65dbg = { info=debug.getinfo(2, 'Sl'), trace=debug.traceback(nil, 1) }
     local op = { cycles=19 }
     op.size = function() late,early = M.size_op(late,early) return 1 end
@@ -194,7 +209,7 @@ M.calt = function(late, early)
     table.insert(M.section_current.instructions, op)
 end
 
-M.calf = function(late, early)
+M['calf' .. 'imm'] = function(late, early)
     local l65dbg = { info=debug.getinfo(2, 'Sl'), trace=debug.traceback(nil, 1) }
     local op = { cycles=16 }
     op.size = function() late,early = M.size_op(late,early) return 2 end
@@ -379,6 +394,24 @@ for k,v in pairs(op48int) do
     end
 end
 
+-- IN/OUT
+local opinout={
+    ['in']=M.op(0x4c,10),
+    out=M.op(0x4d,10),
+} M.opinout = op4inout
+for k,v in pairs(opinout) do
+    M[k .. 'imm'] = function(late, early)
+        local l65dbg = { info=debug.getinfo(2, 'Sl'), trace=debug.traceback(nil, 1) }
+        local op = { cycles=v.cycles }
+        op.size = function() late,early = M.size_op(late,early) return 2 end
+        op.bin = function() local l65dbg=l65dbg 
+            local x = 0x00 + M.op_eval_byte(late,early)
+            return { v.opc, 0x00, x }
+        end
+        table.insert(M.section_current.instructions, op)
+    end
+end
+
 return M
 
 --[[ [todo]