Added a few instructions
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README.md
25
README.md
@ -13,16 +13,21 @@ The T400 is a 12-bit stack machine operating at 1Hz (due to ABMs only running on
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### Instructions
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There are 8 instructions for the T400. Any values encountered by the processor that are not instructions are treated as data and pushed to the stack. While this does make both the code for the emulator and the code for the emulated computer simple, it has the downside that if you really do want the value 4095 you have to add two things together.
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| ins | function | mnemonic |
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|--------|------------------------------|---------------|
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|4095 | push program counter | ppc |
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|4094 | swap TOS | swp |
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|4093 | read memory from TOS | read |
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|4092 | write to memory from TOS | write |
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|4091 | add TOS | add |
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|4090 | suptract TOS | sub |
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|4089 | jump to TOS | jmp |
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|4088 | skip if TOS = zero | sez |
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| ins | function | mnemonic |
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|--------|----------------------------------------------|---------------|
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|4095 | push program counter | ppc |
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|4094 | swap TOS | swp |
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|4093 | read memory from TOS | read |
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|4092 | write to memory from TOS | write |
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|4091 | add TOS | add |
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|4090 | suptract TOS | sub |
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|4089 | jump to TOS | jmp |
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|4088 | skip if TOS = zero | sez |
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|4087 | jump if TOS = zero | jez |
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|4086 | jump to subroutine, push pc to retstack | jsr |
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|4085 | return from subroutine, PC = top of retstack | ret |
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|4084 | duplicate TOS | dup |
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|4083 | drop TOS | drop |
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## T410
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The T410, is, in essence, the write instruction in a block. You put in an address and a value and it tries to write the value to that address.
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@ -23,7 +23,7 @@ local function push(pos,val)
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local sstring = ""
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local sstab = string.split(meta:get_string("stack"),"\n")
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sstab[#sstab+1] = tostring(tonumber(val) % 4096)
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if #sstab > 16 then
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if #sstab > MEMSIZE then
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table.remove(sstab,1)
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end
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for k,v in ipairs(sstab) do
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@ -47,10 +47,13 @@ end
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local function t400_digiline_receive(pos, node, channel, msg)
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print("Digiline: "..tostring(pos.x)..","..tostring(pos.y)..","..tostring(pos.z).."; Channel: "..tostring(channel).."; Message: "..tostring(msg))
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local meta = minetest.get_meta(pos)
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print(meta:get_string("state").." "..meta:get_string("waitingfor"))
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if meta:get_string("state") == "waitingdat" and meta:get_string("waitingfor") == channel then
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print("got data")
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push(pos,tonumber(msg))
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meta:set_int("pc",meta:get_int("pc")+1)
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meta:set_string("state","running")
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print("finished getting data")
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elseif meta:get_string("state") == "waitingins" and meta:get_string("waitingfor") == channel then
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meta:set_int("ci",tonumber(msg))
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meta:set_string("state","running")
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@ -65,6 +68,7 @@ local function t400_set_meta(pos)
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ms = ms .. "0\n"
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end
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meta:set_string("stack",ms)
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meta:set_string("retstack",ms)
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meta:set_string("channel","Default")
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meta:set_string("state","running")
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meta:set_string("waitingfor","")
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@ -116,40 +120,83 @@ minetest.register_abm({
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local skipnext = false
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print("Attempting to run T400 node at "..pos2string(pos))
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local ci = meta:get_int("ci")
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if ci == 4095 then
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if ci == 4095 then -- ppc
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push(pos,meta:get_int("pc"))
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elseif ci == 4094 then
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elseif ci == 4094 then -- swp - why do I have this?
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local a = pop(pos)
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local b = pop(pos)
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print("Swapping "..tostring(a).." for "..tostring(b))
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push(pos,b)
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push(pos,a)
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elseif ci == 4093 then
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elseif ci == 4093 then -- read
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skipnext = true
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local addr = pop(pos)
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meta:set_string("state","waitingdat")
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meta:set_string("waitingfor",meta:get_string("channel")..string.format("%X",addr))
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meta:set_int("pc",meta:get_int("pc")+nins)
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digiline:receptor_send(pos,digiline.rules.default,meta:get_string("channel")..string.format("%X",addr),"get")
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elseif ci == 4092 then
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return
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elseif ci == 4092 then -- write
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local addr = pop(pos)
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local dat = pop(pos)
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print("Writing "..tostring(dat).." to address "..addr)
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digiline:receptor_send(pos,digiline.rules.default,meta:get_string("channel")..string.format("%X",addr),dat)
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elseif ci == 4091 then
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elseif ci == 4091 then -- add
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print("Adding stuff")
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push(pos,pop(pos)+pop(pos))
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elseif ci == 4090 then
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elseif ci == 4090 then -- sub
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push(pos,pop(pos)-pop(pos))
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elseif ci == 4089 then
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elseif ci == 4089 then -- jmp
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local npc = pop(pos)
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print("Jumping to "..tostring(npc))
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meta:set_int("pc",npc)
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elseif ci == 4088 then
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nins=0
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elseif ci == 4088 then -- sez
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local val = pop(pos)
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print(val,type(val))
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if val == 0 then
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print("Skipping because "..tostring(val).." = 0")
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nins=nins+1
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end
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elseif ci == 4087 then -- jez
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local addr = pop(pos)
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local val = pop(pos)
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if val == 0 then
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print("Jumping to "..addr.." because "..val.." = 0")
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meta:set_int("pc",addr)
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nins=0
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end
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elseif ci == 4086 then -- jsr
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local sstring = ""
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local sstab = string.split(meta:get_string("retstack"),"\n")
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sstab[#sstab+1] = tostring(tonumber(meta:get_int("pc")) % 4096)
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if #sstab > MEMSIZE then
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table.remove(sstab,1)
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end
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for k,v in ipairs(sstab) do
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sstring = sstring .. v .. "\n"
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end
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meta:set_string("retstack",sstring)
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meta:set_int("pc",pop(pos))
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nins=0
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elseif ci == 4085 then -- ret
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local sstring = ""
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local sstab = string.split(meta:get_string("retstack"),"\n")
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local sval = tonumber(table.remove(sstab,#sstab))
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for k,v in ipairs(sstab) do
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sstring = sstring .. v .. "\n"
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end
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meta:set_string("retstack",sstring)
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if not sval then sval = 0 end
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meta:set_int("pc",sval)
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elseif ci == 4084 then -- dup
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local v = pop(pos)
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push(pos,v)
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push(pos,v)
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print("Duplicating "..v)
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elseif ci == 4083 then -- drop
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print("Dropping stuff")
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pop(pos)
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else
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print("Pushing "..ci.." to "..pos2string(pos))
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push(pos,ci)
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@ -12,7 +12,7 @@ end
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print("Loading.")
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local function t416_digiline_receive(pos, node, channel, msg)
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print("Digiline: "..tostring(pos.x)..","..tostring(pos.y)..","..tostring(pos.z).."; Channel: "..tostring(channel).."; Message: "..tostring(msg))
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--print("Digiline: "..tostring(pos.x)..","..tostring(pos.y)..","..tostring(pos.z).."; Channel: "..tostring(channel).."; Message: "..tostring(msg))
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local meta = minetest.get_meta(pos)
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local mem = string.split(meta:get_string("mem"),"\n")
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local ms = ""
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