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        Halo88 - API

        Entry:

          BX = function
                64h arc
                65h bar
                66h box
                67h circle
                68h clr
                69h default hatch style
                6Ah default line style
                6Bh delhcur
                6Ch delln / deltcur
                6Dh ellipse
                6Eh fill
                6Fh flood
                70h flood2
                71h init graphics
                72h init hcur
                73h init marker
                74h init tcur
                75h inqarc
                76h inqbknd
                77h inqclr
                78h inqerr
                79h inqgcur
                7Ah inqhcur
                7Bh inqmarker
                7Dh inqtcur
                7Eh inqtext
                7Fh lnabs
                80h lnrel
                81h markerabs
                82h markerrel
                83h moveabs
                84h movehcurabs
                85h movehcurrel
                86h moverel
                87h movetcurabs
                88h movetcurrel
                89h movefrom
                8Ah moveto
                8Bh pie
                8Ch polylnabs
                8Dh polylnrel
                8Eh ptabs
                8Fh ptrel
                91h setasp
                92h set color
                93h set font
                94h set hatch style
                95h set line style
                97h settext
                98h set text color
                99h btext
                9Ah setseg
                9Bh display
                9Ch setscreen
                9Eh close graphics
                9Fh ftinit
                A0h ftlocate
                A1h ftext
                A5h set viewport
                A6h set window
                A7h set world
                AAh ftcolor
                ACh initlp
                ADh inqasp
                AEh inqdev
                AFh inqdisplay
                B0h inqft
                B1h inqftcolor
                B2h inqinterlace
                B3h inqlpa
                B4h inqlpg
                B5h inqmode
                B6h inqscreen
                B7h inqversion
                B8h roam
                B9h scroll
                BAh setieee
                BBh set interlace
                BCh shift
                BDh start graphics
                BEh vpan
                CBh gwrite
                CCh gread
                CDh setxor
                CEh rbox
                CFh rcir
                D0h rlnabs
                D1h rlnrel
                D2h delbox
                D3h delcir
                D5h setseg2
                DCh worldoff
                DDh mapwtod
                DEh mapdtow
                DFh mapwton
                E0h mapntow
                E1h mapdton
                E2h mapntod
                E3h inqworld
                E4h inqviewport
                E5h set line width
                E6h lnjoint
                E7h set locator
                E8h read locator
                E9h setdev
                EBh setstext
                ECh setstclr
                EDh setstang
                EEh stext
                EFh inqstext
                F0h setdegree
                F1h inqstsize
                F2h polyfabs
                F3h polyfrel
                F4h inqdrange
                F5h inqstang
                F6h orglocator
                F7h inqlocator
                F8h inqarea
                F9h setipal
                FAh setborder
                FBh inqcrange
                FEh setclip
                FFh fcir
               100h setcrange
               101h setdrange
               102h setlattr
               103h polycabs
               104h polycrel
               108h memcom
               109h memexp
               10Ah memmov
               10Eh movefx
               10Fh movetx
               110h inqrgb
               111h save image
               112h restore image
               113h setapal
               114h setxpal
               118h inqtsize
               12Eh gprint
               130h setprn
               131h setpattr
               133h setbattr
               135h pexpand
               136h ptnorm
               137h pfnorm
               13Bh inqprn
               13Ch lopen
               13Dh lclose
               13Eh lappend
               13Fh lrecord
               140h lswitch
               142h inqfun
               15Dh lsetup
               15Eh lrest
               15Fh lsave
        additional parameters on stack

        Return:
          ???

        Notes:  Halo88 is a suite of graphics routines according to
                Stuart Kemp, the code appears to make no provisions for
                chaining