This example actually puts the Transputer to some sort of use… well, it’s still way beneath him but it does its job as an example.
Two tasks: a) Read the Transputer executable from disk and b) exchange data with the Transputer.

Here we go:

10 PRINT"INIT TRANSPUTER"
20 POKE 56840,0
30 POKE 56844,0
40 POKE 56840,1:POKE 56840,0
50 FOR W=0 TO 1000:NEXT W
60 POKE 56834,0
70 POKE 56835,0
80 REM READ STATI
90 PRINT "I STATUS: ";(PEEK(56834)AND1)
100 PRINT"O STATUS: ";(PEEK(56835)AND1)
110 PRINT"ERROR: ";(PEEK(56840)AND1)
140 PRINT"O STATUS: ";(PEEK(56835)AND1)

Up to here everything should be clear. Init Transputer, read stati -just to be sure.
Now we’re reading the executable (“GRAB”) from floppy and poke the bytes to the Transputer as they come flying crawling in:

150 DIM R(4)
160 PRINT"SENDING PROGRAM TO TRANSPUTER..."
170 REM READ TRANSPUTER BIN FILE
180 OPEN 1,8,2,"0:GRAB,S,R"
190 FOR I=0 TO 1 STEP 0
200 IF ST=64 GOTO 240
210 GET#1,A$:A=ASC(A$+CHR$(0))
220 POKE 56833,A
230 NEXT I
240 CLOSE 1

Ok, the Transputer binary expects us to tell it the number of integers we’re about to send to it (AN), the we send these (X) and finally re-read the results… which should all be X+7.

250 INPUT"COUNT:";AN
255 POKE 56833,AN
260 FOR AA=1 TO AN
270 PRINT"ENTER ";AA:INPUT X
280 POKE56833,X
290 NEXT AA
295 PRINT"GETTING";PEEK(56832);" RESULTS"
300 FOR BB=1 TO AN
310 PRINTPEEK(56832);
320 NEXT BB

Some final words about Transputer executables. There are many kinds depending which development system was used. Some need special loaders or bootfiles before the actual binary will be send to the Transputer. A ‘raw’ upload is only possible with binaries mostly having the extension of “.btl” (BooTfromLink). AFAIK only the OCCAM SDK and the Inmos C-compiler ‘icc’ will create those executables.

For those geeks who actually (still) do know their OCCAM, here’s the source of GRAB:

PROC first(CHAN OF BYTE in, out)
  #USE "hostio.lib"

  BYTE data.in, data.out :
  INT count, temp :
  [1000]BYTE array :

-- {{{ start main SEQ

  SEQ
    in ? data.in
    count := (INT data.in)
    SEQ i=0 FOR count
      in ? array[i]                   

        -- {{{ inner loop
        
            SEQ i=0 FOR count
              SEQ
                temp := (INT array[i])
                temp := temp + 7
                array[i] := (BYTE temp)
        
        -- end of inner loop
        -- }}}
                
    out ! (BYTE count)
    SEQ i=0 FOR count
      out ! array[i]          
    in ? data.in       -- debug only
    CAUSEERROR()

-- }}}
        
: