Forth by W. P. SALMAN, O. Tisserand, B. Toulout

By W. P. SALMAN, O. Tisserand, B. Toulout

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This automatic handling of changes in scale by the machine has certainly been ill thought through and can be held to be detrimental to good programming. What are the legitimate uses of the floating point? 1. You want to use the machine as a floating-point calculator. 2. You value development time more highly than execution time. 3. The variation in range of your data is really too great. 4. You have a hard-wired, floating-point processor which optimises this type of calculation. For its part, FORTH has many more affinities for fixed point than for floating point, since it fits in better with the moderate and precise character of the FORTH programmer.

TYPE o DO DUP C@ EMIT 1+ ( LOOP ( DROP OK Addr n --Addr --- ) Addr c --Addr --- ) Addr+1 --- ) Here is another application of the keyboard and the screen. PLAY CR BEGIN 32 WORD HERE 1+ C@ WHILE HERE COUNT TYPE CR REPEAT OK PLAY AT HOME AT HOME OK (Transfers word to end of dictionary) (Value of first character) (Test for end) (Prepares parameters for TYPE) (Prints word) The interpreter detects and executes the words in the input stream in succession. Detection is by means of the separator - here a space.

ELSE FLAG IF NEXTPAGE @ DISK<-MEM THEN THEN NEXTPAGE @ MEM<-DISK +PAGE OK The heart of the overlay algorithm of course resides in +PAGE. The principal stages in the resolution of this problem are FIFO allocation - the oldest of the resident pages is replaced. Statistical allocation - the least frequently used page is replaced. Hierarchical allocation - the lowest priority page is replaced. In conclusion we note that operating systems generally use a combination of these different methods; sometimes the algorithm can even evolve in order to optimise response time.

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