GW BASIC ASM CODE NOTES

GW-BASIC ASM CODE NOTES

Step 1 Create Object (*.obj) Code in TASM - Parameter Passing is unique to GW-BASIC.

TASM MYCODE.ASM

The same method does not work in Turbo Pascal even though you can link it Take a look at SetRGB/SetERGB and Mouse code to see format of parameter passing

Step 2

Use TLINK to link to object (*.OBJ) to .EXE

TLINK MYCODE.OBJ

Step 3

Use EXE2BIN to convert *.EXE file to *.COM (could be other extension like *.BIN)

if you are using Dosbox use the WATCOM EXE2BIN

EXE2BIN MYCODE.EXE MYCODE.COM

Step 4

Use BIN2BSV to convert *.COM to *.BSV file - Use BLOAD to load into an array.

BIN2BSV MYCODE.COM NYCODE.BSV

eg V1%=10:V2%=20 'must assign values to variables before calling - you cannot just call mycmd(10,20)

the variables are needed for returning values also. This is just way GW-BASIC expects things to be done

DIM CODE%(200):BLOAD "MYCMD.BSV",VARPTR(CODE%(0)):CALL MYCMD(V1%,V2%)

or

Use BIN2SRC to convert *.COM to DATA statements that can be read into an array.

eg DIM CODE%(200):FOR I=1 to 100:READ CODE%(I):NEXT I

or

Use BIN2SRC to convert *.COM to array elements with values assigned (this works well when code is very small)