Home » Personal collection » Acorn DFS disks » dfs_box03_disk13_bcpl_calc.scp » EXCLNXB
EXCLNXB
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn DFS disks » dfs_box03_disk13_bcpl_calc.scp |
| Filename: | EXCLNXB |
| Read OK: | ✔ |
| File size: | 06FB bytes |
| Load address: | FF37B0 |
| Exec address: | 0007 |
File contents
SECTION "EXCLNXB"
// Floating/fixed point calculator - fixed point function key
// routines.
// The calculation procedures used are
// copyright Richards Computer Products Ltd. (C) 1983
// Written by C Jobson 19/04/83
// Contains DISPFNS & INTERPFN.
GET "LIBHDR"
GET "FPHDR"
GET "EXCLHDR"
// DISPFNS is called on startup and whenever function key 0 is pressed
// to change the use of the other function keys. It must set up the
// globals MAXFN & FNSETMAX and display the function key usage on row
// 23 of the screen (' ' should be displayed for f0 and a
// 3-character legend for each of f1 to f9).
LET DISPFNS() BE
$( LET STR = ?
FNSETMAX := 0 // only one set of functions
MAXFN := FIRSTFN+7 // only keys f0 to f7 used
CURSOR(0, 23)
WRITES(" e exp ln sqr -x x^2 1/x ")
$)
// INTERPFN is called by GETCH when a function key is pressed. It
// must set FUNCOP to the address of the appropriate procedure to
// perform the function and return a value of T.NUMOP if the function
// provides a constant (e.g. e) or T.MONOP if it is a function of one
// variable (e.g. exp). On entry CH holds the code given by the
// function key.
AND INTERPFN() = VALOF
$( LET KEYNO = CH - FIRSTFN // function key number
IF KEYNO = 1 THEN // e
$( FUNCOP := FE
RESULTIS T.NUMOP
$)
FUNCOP := KEYNO=2 -> FEXP,
KEYNO=3 -> FLN,
KEYNO=4 -> FSQRT,
KEYNO=5 -> FNEG,
KEYNO=6 -> SQUARE, RECIP
RESULTIS T.MONOP
$)
// RECIP calculates B := 1/A.
AND RECIP(A, B) = VALOF
$( LET ONE = VEC FP.LEN
RESULTIS FDIV(FFLOAT(1, ONE), A, B)
$)
// SQUARE calculates B := A*A.
AND SQUARE(A, B) = FMULT(A, A, B)
00000000 53 45 43 54 49 4f 4e 20 22 45 58 43 4c 4e 58 42 |SECTION "EXCLNXB|
00000010 22 0d 0a 0d 0a 2f 2f 20 46 6c 6f 61 74 69 6e 67 |"....// Floating|
00000020 2f 66 69 78 65 64 20 70 6f 69 6e 74 20 63 61 6c |/fixed point cal|
00000030 63 75 6c 61 74 6f 72 20 2d 20 66 69 78 65 64 20 |culator - fixed |
00000040 70 6f 69 6e 74 20 66 75 6e 63 74 69 6f 6e 20 6b |point function k|
00000050 65 79 0d 0a 2f 2f 20 72 6f 75 74 69 6e 65 73 2e |ey..// routines.|
00000060 0d 0a 2f 2f 20 54 68 65 20 63 61 6c 63 75 6c 61 |..// The calcula|
00000070 74 69 6f 6e 20 70 72 6f 63 65 64 75 72 65 73 20 |tion procedures |
00000080 75 73 65 64 20 61 72 65 0d 0a 2f 2f 20 63 6f 70 |used are..// cop|
00000090 79 72 69 67 68 74 20 52 69 63 68 61 72 64 73 20 |yright Richards |
000000a0 43 6f 6d 70 75 74 65 72 20 50 72 6f 64 75 63 74 |Computer Product|
000000b0 73 20 4c 74 64 2e 20 28 43 29 20 31 39 38 33 0d |s Ltd. (C) 1983.|
000000c0 0a 2f 2f 20 57 72 69 74 74 65 6e 20 62 79 20 43 |.// Written by C|
000000d0 20 4a 6f 62 73 6f 6e 20 20 31 39 2f 30 34 2f 38 | Jobson 19/04/8|
000000e0 33 0d 0a 0d 0a 2f 2f 20 43 6f 6e 74 61 69 6e 73 |3....// Contains|
000000f0 20 44 49 53 50 46 4e 53 20 26 20 49 4e 54 45 52 | DISPFNS & INTER|
00000100 50 46 4e 2e 0d 0a 0d 0a 47 45 54 20 22 4c 49 42 |PFN.....GET "LIB|
00000110 48 44 52 22 0d 0a 47 45 54 20 22 46 50 48 44 52 |HDR"..GET "FPHDR|
00000120 22 0d 0a 47 45 54 20 22 45 58 43 4c 48 44 52 22 |"..GET "EXCLHDR"|
00000130 0d 0a 0d 0a 0d 0a 2f 2f 20 44 49 53 50 46 4e 53 |......// DISPFNS|
00000140 20 69 73 20 63 61 6c 6c 65 64 20 6f 6e 20 73 74 | is called on st|
00000150 61 72 74 75 70 20 61 6e 64 20 77 68 65 6e 65 76 |artup and whenev|
00000160 65 72 20 66 75 6e 63 74 69 6f 6e 20 6b 65 79 20 |er function key |
00000170 30 20 69 73 20 70 72 65 73 73 65 64 0d 0a 2f 2f |0 is pressed..//|
00000180 20 74 6f 20 63 68 61 6e 67 65 20 74 68 65 20 75 | to change the u|
00000190 73 65 20 6f 66 20 74 68 65 20 6f 74 68 65 72 20 |se of the other |
000001a0 66 75 6e 63 74 69 6f 6e 20 6b 65 79 73 2e 20 49 |function keys. I|
000001b0 74 20 6d 75 73 74 20 73 65 74 20 75 70 20 74 68 |t must set up th|
000001c0 65 0d 0a 2f 2f 20 67 6c 6f 62 61 6c 73 20 4d 41 |e..// globals MA|
000001d0 58 46 4e 20 26 20 46 4e 53 45 54 4d 41 58 20 61 |XFN & FNSETMAX a|
000001e0 6e 64 20 64 69 73 70 6c 61 79 20 74 68 65 20 66 |nd display the f|
000001f0 75 6e 63 74 69 6f 6e 20 6b 65 79 20 75 73 61 67 |unction key usag|
00000200 65 20 6f 6e 20 72 6f 77 0d 0a 2f 2f 20 32 33 20 |e on row..// 23 |
00000210 6f 66 20 74 68 65 20 73 63 72 65 65 6e 20 28 27 |of the screen ('|
00000220 20 20 20 20 27 20 73 68 6f 75 6c 64 20 62 65 20 | ' should be |
00000230 64 69 73 70 6c 61 79 65 64 20 66 6f 72 20 66 30 |displayed for f0|
00000240 20 61 6e 64 20 61 0d 0a 2f 2f 20 33 2d 63 68 61 | and a..// 3-cha|
00000250 72 61 63 74 65 72 20 6c 65 67 65 6e 64 20 66 6f |racter legend fo|
00000260 72 20 65 61 63 68 20 6f 66 20 66 31 20 74 6f 20 |r each of f1 to |
00000270 66 39 29 2e 0d 0a 0d 0a 4c 45 54 20 44 49 53 50 |f9).....LET DISP|
00000280 46 4e 53 28 29 20 42 45 0d 0a 24 28 20 4c 45 54 |FNS() BE..$( LET|
00000290 20 53 54 52 20 3d 20 3f 0d 0a 20 20 20 46 4e 53 | STR = ?.. FNS|
000002a0 45 54 4d 41 58 20 3a 3d 20 30 20 20 20 20 20 20 |ETMAX := 0 |
000002b0 20 20 20 20 20 2f 2f 20 6f 6e 6c 79 20 6f 6e 65 | // only one|
000002c0 20 73 65 74 20 6f 66 20 66 75 6e 63 74 69 6f 6e | set of function|
000002d0 73 0d 0a 20 20 20 4d 41 58 46 4e 20 3a 3d 20 46 |s.. MAXFN := F|
000002e0 49 52 53 54 46 4e 2b 37 20 20 20 20 20 20 2f 2f |IRSTFN+7 //|
000002f0 20 6f 6e 6c 79 20 6b 65 79 73 20 66 30 20 74 6f | only keys f0 to|
00000300 20 66 37 20 75 73 65 64 0d 0a 20 20 20 43 55 52 | f7 used.. CUR|
00000310 53 4f 52 28 30 2c 20 32 33 29 0d 0a 20 20 20 57 |SOR(0, 23).. W|
00000320 52 49 54 45 53 28 22 20 20 20 20 20 65 20 20 20 |RITES(" e |
00000330 65 78 70 20 6c 6e 20 20 73 71 72 20 2d 78 20 20 |exp ln sqr -x |
00000340 78 5e 32 20 31 2f 78 20 20 20 20 20 20 20 20 22 |x^2 1/x "|
00000350 29 0d 0a 24 29 0d 0a 0d 0a 0d 0a 2f 2f 20 49 4e |)..$)......// IN|
00000360 54 45 52 50 46 4e 20 69 73 20 63 61 6c 6c 65 64 |TERPFN is called|
00000370 20 62 79 20 47 45 54 43 48 20 77 68 65 6e 20 61 | by GETCH when a|
00000380 20 66 75 6e 63 74 69 6f 6e 20 6b 65 79 20 69 73 | function key is|
00000390 20 70 72 65 73 73 65 64 2e 20 20 49 74 0d 0a 2f | pressed. It../|
000003a0 2f 20 6d 75 73 74 20 73 65 74 20 46 55 4e 43 4f |/ must set FUNCO|
000003b0 50 20 74 6f 20 74 68 65 20 61 64 64 72 65 73 73 |P to the address|
000003c0 20 6f 66 20 74 68 65 20 61 70 70 72 6f 70 72 69 | of the appropri|
000003d0 61 74 65 20 70 72 6f 63 65 64 75 72 65 20 74 6f |ate procedure to|
000003e0 0d 0a 2f 2f 20 70 65 72 66 6f 72 6d 20 74 68 65 |..// perform the|
000003f0 20 66 75 6e 63 74 69 6f 6e 20 61 6e 64 20 72 65 | function and re|
00000400 74 75 72 6e 20 61 20 76 61 6c 75 65 20 6f 66 20 |turn a value of |
00000410 54 2e 4e 55 4d 4f 50 20 69 66 20 74 68 65 20 66 |T.NUMOP if the f|
00000420 75 6e 63 74 69 6f 6e 0d 0a 2f 2f 20 70 72 6f 76 |unction..// prov|
00000430 69 64 65 73 20 61 20 63 6f 6e 73 74 61 6e 74 20 |ides a constant |
00000440 28 65 2e 67 2e 20 65 29 20 6f 72 20 54 2e 4d 4f |(e.g. e) or T.MO|
00000450 4e 4f 50 20 69 66 20 69 74 20 69 73 20 61 20 66 |NOP if it is a f|
00000460 75 6e 63 74 69 6f 6e 20 6f 66 20 6f 6e 65 0d 0a |unction of one..|
00000470 2f 2f 20 76 61 72 69 61 62 6c 65 20 28 65 2e 67 |// variable (e.g|
00000480 2e 20 65 78 70 29 2e 20 20 4f 6e 20 65 6e 74 72 |. exp). On entr|
00000490 79 20 43 48 20 68 6f 6c 64 73 20 74 68 65 20 63 |y CH holds the c|
000004a0 6f 64 65 20 67 69 76 65 6e 20 62 79 20 74 68 65 |ode given by the|
000004b0 0d 0a 2f 2f 20 66 75 6e 63 74 69 6f 6e 20 6b 65 |..// function ke|
000004c0 79 2e 0d 0a 0d 0a 41 4e 44 20 49 4e 54 45 52 50 |y.....AND INTERP|
000004d0 46 4e 28 29 20 3d 20 56 41 4c 4f 46 0d 0a 24 28 |FN() = VALOF..$(|
000004e0 20 4c 45 54 20 4b 45 59 4e 4f 20 3d 20 43 48 20 | LET KEYNO = CH |
000004f0 2d 20 46 49 52 53 54 46 4e 20 20 20 2f 2f 20 66 |- FIRSTFN // f|
00000500 75 6e 63 74 69 6f 6e 20 6b 65 79 20 6e 75 6d 62 |unction key numb|
00000510 65 72 0d 0a 0d 0a 20 20 20 49 46 20 4b 45 59 4e |er.... IF KEYN|
00000520 4f 20 3d 20 31 20 54 48 45 4e 20 20 20 20 20 20 |O = 1 THEN |
00000530 20 20 20 20 2f 2f 20 65 0d 0a 20 20 20 24 28 20 | // e.. $( |
00000540 46 55 4e 43 4f 50 20 3a 3d 20 46 45 0d 0a 20 20 |FUNCOP := FE.. |
00000550 20 20 20 20 52 45 53 55 4c 54 49 53 20 54 2e 4e | RESULTIS T.N|
00000560 55 4d 4f 50 0d 0a 20 20 20 24 29 0d 0a 0d 0a 20 |UMOP.. $).... |
00000570 20 20 46 55 4e 43 4f 50 20 3a 3d 20 4b 45 59 4e | FUNCOP := KEYN|
00000580 4f 3d 32 20 2d 3e 20 46 45 58 50 2c 0d 0a 20 20 |O=2 -> FEXP,.. |
00000590 20 20 20 20 20 20 20 20 20 20 20 4b 45 59 4e 4f | KEYNO|
000005a0 3d 33 20 2d 3e 20 46 4c 4e 2c 0d 0a 20 20 20 20 |=3 -> FLN,.. |
000005b0 20 20 20 20 20 20 20 20 20 4b 45 59 4e 4f 3d 34 | KEYNO=4|
000005c0 20 2d 3e 20 46 53 51 52 54 2c 0d 0a 20 20 20 20 | -> FSQRT,.. |
000005d0 20 20 20 20 20 20 20 20 20 4b 45 59 4e 4f 3d 35 | KEYNO=5|
000005e0 20 2d 3e 20 46 4e 45 47 2c 0d 0a 20 20 20 20 20 | -> FNEG,.. |
000005f0 20 20 20 20 20 20 20 20 4b 45 59 4e 4f 3d 36 20 | KEYNO=6 |
00000600 2d 3e 20 53 51 55 41 52 45 2c 20 52 45 43 49 50 |-> SQUARE, RECIP|
00000610 0d 0a 0d 0a 20 20 20 52 45 53 55 4c 54 49 53 20 |.... RESULTIS |
00000620 54 2e 4d 4f 4e 4f 50 0d 0a 24 29 0d 0a 0d 0a 0d |T.MONOP..$).....|
00000630 0a 2f 2f 20 52 45 43 49 50 20 63 61 6c 63 75 6c |.// RECIP calcul|
00000640 61 74 65 73 20 42 20 3a 3d 20 31 2f 41 2e 0d 0a |ates B := 1/A...|
00000650 0d 0a 41 4e 44 20 52 45 43 49 50 28 41 2c 20 42 |..AND RECIP(A, B|
00000660 29 20 3d 20 56 41 4c 4f 46 0d 0a 24 28 20 4c 45 |) = VALOF..$( LE|
00000670 54 20 4f 4e 45 20 3d 20 56 45 43 20 46 50 2e 4c |T ONE = VEC FP.L|
00000680 45 4e 0d 0a 20 20 20 52 45 53 55 4c 54 49 53 20 |EN.. RESULTIS |
00000690 46 44 49 56 28 46 46 4c 4f 41 54 28 31 2c 20 4f |FDIV(FFLOAT(1, O|
000006a0 4e 45 29 2c 20 41 2c 20 42 29 0d 0a 24 29 0d 0a |NE), A, B)..$)..|
000006b0 0d 0a 0d 0a 2f 2f 20 53 51 55 41 52 45 20 63 61 |....// SQUARE ca|
000006c0 6c 63 75 6c 61 74 65 73 20 42 20 3a 3d 20 41 2a |lculates B := A*|
000006d0 41 2e 0d 0a 0d 0a 41 4e 44 20 53 51 55 41 52 45 |A.....AND SQUARE|
000006e0 28 41 2c 20 42 29 20 3d 20 46 4d 55 4c 54 28 41 |(A, B) = FMULT(A|
000006f0 2c 20 41 2c 20 42 29 0d 0a 0d 0a |, A, B)....|
000006fb 
EXCLNXB.m0
EXCLNXB.m1
EXCLNXB.m2
EXCLNXB.m4
EXCLNXB.m5
.