(* programme comment‚ et expliqu‚ dans le livre *)
(* LE DESASSEMBLEUR 8086 COLIBRI, publi‚ par    *)
(*           L'INSTITUT PASCAL:                 *)
(*      26 Rue Lamartine, 75009 PARIS           *)
(*           Tel: (1) 42.85.10.82               *)


      procedure commente_dos;
        begin
          met(' ; ');
          case l_ah_precedent of
           $00 : met('termine pg. PSP= CS');
           $01 : met('lis clavier avec echo. Car:= AL');
           $02 : begin
                   met2('affiche car: ', f_octet_hexadecimal(l_dl_precedent));
                   if l_dl_precedent in [32..126]
                     then met2(' ', chr(l_dl_precedent));
                 end;
           $03 : met('lis aux. Car:= AL');
           $04 : begin
                   met2('ecris aux: ', f_octet_hexadecimal(l_dl_precedent));
                   if l_dl_precedent in [32..126]
                     then met2(' ', chr(l_dl_precedent));
                 end;
           $05 : begin
                   met2('imprime car: ', f_octet_hexadecimal(l_dl_precedent));
                   if l_dl_precedent in [32..126]
                     then met2(' ',  chr(l_dl_precedent));
                 end;
           $06 : met('direct console io. Si DL= $FF teste clav, Car:= AL; sinon affiche DL');
           $07 : met('lis console direct. Car:= AL, ss CTRL C ni echo');
           $08 : met('lis clavier. ss echo, mais test CTRL C');
           $09 : met2('affiche chaine: DS:', f_entier_hexadecimal(l_dx_precedent));
           $0A : met2('lis clavier tamponne: DS:', f_entier_hexadecimal(l_dx_precedent));
           $0B : met('test clavier. AL= $FF => car ds tampon');
           $0C : met2('flush tampon, lis clavier par fct MS DOS: ', f_octet_hexadecimal(l_al_precedent));
           $0D : met('reset disque');
           $0E : met3('select disk ', chr(l_dl_precedent+ 64), ' nb dsk= DL');
           $0F : met3('ouvre fichier. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $10 : met3('ferme fichier. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $11 : met3('cherche 1ere entree. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $12 : met3('cherche entree suiv. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $13 : met3('efface fichier. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $14 : met3('lis sequent. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' resu: AL');
           $15 : met3('ecris sequent. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' resu: AL');
           $16 : met3('cree fichier. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $17 : met3('renomme fichier. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');

           $19 : met('disque courant. disque:= AL');

           $1A : met3('cree dta. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb dir: AL= $FF');
           $1B : met('read alloc table adr DOS1');

           $21 : met3('lis random. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' resu: AL');
           $22 : met3('ecris random. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' resu: AL');
           $23 : met3('filesize. FCB: DS:', f_entier_hexadecimal(l_dx_precedent), ' pb: AL= $FF');
           $24 : met2('set relative record. FCB: DS:', f_entier_hexadecimal(l_dx_precedent));
           $25 : begin
                   met2('set vector #', f_octet_hexadecimal(l_al_precedent));
                   met2(' isr: DS:', f_entier_hexadecimal(l_dx_precedent));
                 end;
           $26 : met('cree nouveau PSP DOS1');
           $27 : begin
                   met2('lis random block. FCB: DS:', f_entier_hexadecimal(l_dx_precedent));
                   met2(' nb: ', f_entier_hexadecimal(l_cx_precedent));
                   met(' resu: AL= 0, 1, 2, 3, CX= nb lus');
                 end;
           $28 : begin
                   met2('ecris random block. FCB: DS:', f_entier_hexadecimal(l_dx_precedent));
                   met2(' nb: ', f_entier_hexadecimal(l_cx_precedent));
                   met(' resu: AL= 0, 1, 2, CX= nb lus');
                 end;
           $29 : begin
                   met2('parse nom fichier. param: ', f_octet_hexadecimal(l_al_precedent));
                   met(' nom: DS:SI, FCB: ES:DI. resu: AL, DS:SI, ES:DI');
                 end;
           $2A : met('get date. an: CX, mois: DH, quant: DL, jour: AL');
           $2B : begin
                   met2('set date. an:', f_entier_hexadecimal(l_cx_precedent));
                   met2(' mois: ', f_octet_hexadecimal(l_dh_precedent));
                   met3(' quant: ', f_entier_hexadecimal(l_dl_precedent), ' >ok AL=0');
                 end;
           $2C : met('get time. >heure= CH, min= CL, sec= DH, 1/100= DL');
           $2D : begin
                   met2('set time. heure: ', f_octet_hexadecimal(l_ch_precedent));
                   met2(' min: ', f_octet_hexadecimal(l_cl_precedent));
                   met2(' sec: ', f_octet_hexadecimal(l_dh_precedent));
                   met3(' 1/100: ', f_octet_hexadecimal(l_dl_precedent), ' >ok AL= 0');
                 end;
           $2E : met2('set/reset verify flag ', f_octet_hexadecimal(l_al_precedent));
           $2F : met('get dta. >ES:BX');
           $30 : met('get dos version. >AH AL');
           $31 : begin
                   met2('keep process. Exit code ', f_octet_hexadecimal(l_al_precedent));
                   met2(' parg m‚moire ', f_entier_hexadecimal(l_dx_precedent));
                 end;

           $33 : met('CTRL C check');

           $35 : met('get interrupt vect');
           $36 : met('get disk free space');

           $38 : met('return pays');
           $39 : met('cree dir');
           $3A : met('supprime entree dir');
           $3B : met('change dir courant');
           $3C : met('cree fichier');
           $3D : met('ouvre fichier');
           $3E : met('ferme file handle');
           $3F : met('lis fichier/periph');
           $40 : met('ecris fichier/periph');
           $41 : met('efface entree dir');
           $42 : met('deplace file pointer');
           $43 : met('change attribut');
           $44 : met('io controle periph');
           $45 : met('double un file handle');
           $46 : met('force un duplicat du handle');
           $47 : met('retourne texte du dir');
           $48 : met('alloue m‚moireoire');
           $49 : met('m‚moireoire libre');
           $4A : met('modif blocs allou‚s');
           $4B : met('charge et execute pg');
           $4C : met('termine un process');
           $4D : met('recupere code retour de fils');
           $4E : met('trouve fichier match');
           $4F : met('pas a pas des match');

           $54 : met('retourne status de verify');

           $56 : met('deplace dir entry');
           $57 : met('get set date of file');
          end;
        end; 

      procedure commente_interruption;
        begin
          met(' ; ****');
          case l_operande of
           $00 : met(' div par 0');
           $01 : met(' pas a pas');
           $02 : met(' nmi');
           $03 : met(' trappe pt arret');
           $04 : met(' debordement');
           $05 : met(' bios imprime ecran');
           $08 : met(' horloge');
           $09 : met(' clavier');
           $0A..$0C : met(' res communications');
           $0F : met(' res imprimante');
           $10 : begin
                   met(' ; BIOS ECR');
                   case l_ah_precedent of
                    $00 : case l_al_precedent of
                           $00 : met(' set 40*25 bw');
                           $01 : met(' set 40*25 coul');
                           $02 : met(' set 80*25 bw');
                           $03 : met(' set 80*25 coul');
                           $04 : met(' set 320*200 coul');
                           $05 : met(' set 320*200 bw');
                           $06 : met(' set 640*200 bw');
                          end;
                    $01 : begin
                            met(' type curseur');
                            met(f_octet_hexadecimal(l_ch_precedent));
                            met(' a ');
                            met(f_octet_hexadecimal(l_cl_precedent));
                          end;
                    $02 : begin
                            met(' curseur en ');
                            met(f_octet_hexadecimal(l_dh_precedent));
                            met(' ');
                            met(f_octet_hexadecimal(l_dl_precedent));
                            met(' page ');
                            met(f_octet_hexadecimal(l_bh_precedent));
                          end;
                    $03 : begin
                            met(' lit curs page ');
                            met(f_octet_hexadecimal(l_bh_precedent));
                          end;
                    $04 : met(' lit crayon');
                    $05 : begin
                            met(' set page ');
                            met(f_octet_hexadecimal(l_al_precedent));
                          end;
                    $06 : begin
                            met(' scroll up nb ');
                            met(f_octet_hexadecimal(l_al_precedent));
                            met(' hg ');
                            met(f_octet_hexadecimal(l_ch_precedent));
                            met(f_octet_hexadecimal(l_cl_precedent));
                            met(' bd ');
                            met(f_octet_hexadecimal(l_dh_precedent));
                            met(f_octet_hexadecimal(l_dl_precedent));
                            met(' attr ');
                            met(f_octet_hexadecimal(l_bh_precedent));
                          end;
                    $07 : begin
                            met(' scroll dwn nb ');
                            met(f_octet_hexadecimal(l_al_precedent));
                            met(' hg ');
                            met(f_octet_hexadecimal(l_ch_precedent));
                            met(f_octet_hexadecimal(l_cl_precedent));
                            met(' bd ');
                            met(f_octet_hexadecimal(l_dh_precedent));
                            met(f_octet_hexadecimal(l_dl_precedent));
                            met(' attr ');
                            met(f_octet_hexadecimal(l_bh_precedent));
                          end;
                    $08 : begin
                            met(' lit car page ');
                            met(f_octet_hexadecimal(l_al_precedent));
                          end;
                    $09 : begin
                            met(' ecris car page ');
                            met(f_octet_hexadecimal(l_al_precedent));
                            met(' nb '); met(f_entier_hexadecimal(l_cx_precedent));
                            met2(' car ', f_octet_hexadecimal(l_al_precedent));
                            met2(' attr ', f_octet_hexadecimal(l_bl_precedent));
                          end;
                    $0A : begin
                            met(' ecris car page ');
                            met(f_octet_hexadecimal(l_al_precedent));
                            met2(' nb ', f_entier_hexadecimal(l_cx_precedent));
                            met2(' car ', f_octet_hexadecimal(l_al_precedent));
                          end;
                    $0B : begin
                            met(' set palette ');
                            met(f_octet_hexadecimal(l_bh_precedent));
                            met(' coul ');
                            met(f_octet_hexadecimal(l_bl_precedent));
                          end;
                    $0C : begin
                            met(' ecris point ligne ');
                            met(f_entier_hexadecimal(l_dx_precedent));
                            met(' col ');
                            met(f_entier_hexadecimal(l_cx_precedent));
                            met(' coul ');
                            met(f_octet_hexadecimal(l_al_precedent));
                          end;
                    $0D : begin
                            met(' lis point ligne ');
                            met(f_entier_hexadecimal(l_dx_precedent));
                            met(' col ');
                            met(f_entier_hexadecimal(l_cx_precedent));
                            met(' coul ');
                            met(f_octet_hexadecimal(l_al_precedent));
                          end;
                    $0E : begin
                            met(' ecris tty ');
                            met(f_octet_hexadecimal(l_al_precedent));
                            met(' coul ');
                            met(f_octet_hexadecimal(l_bl_precedent));
                            met(' page ');
                            met(f_octet_hexadecimal(l_bh_precedent));
                          end;
                    $0F : met(' lis l_mode video');
                    else met2(' ?????? ', f_octet_hexadecimal(l_ah_precedent));
                   end; 
                 end; 
           $11 : met(' test config');
           $12 : met(' taille m‚moire');
           $13 : met(' disquette');
           $14 : met(' serie');
           $15 : met(' cassette');
           $16 : begin
                   met(' ; BIOS CLAV ');
                   case l_ah_precedent of
                    $00 : met(' lis car');
                    $01 : met(' test car');
                    $02 : met(' shift status');
                   end; 
                 end; 
            $17 : met(' imprimante');
            $18 : met(' basic cassette');
            $19 : met(' bootstrap');
            $1A : met(' heure');
            $1B : met(' ctrl brk');
            $1C : met(' top horloge');
            $1D : met(' initialise video');
            $1E : met(' param disquette');
            $1F : met(' car graphiques');
            $20 : met(' DOS pg terminate. PSP= cs');
            $21 : commente_dos;
            $22 : met(' DOS terminate address');
            $23 : met(' DOS CTRL C exit address');
            $24 : met(' DOS fatal disk error address. FCB ds bp:si');
            $25 : begin
                    met(' DOS absolute disk read');
                    met2(' dr: ', chr(l_al_precedent+ 64));
                    met2(' dta: DS:', f_entier_hexadecimal(l_bx_precedent));
                    met2(' nb sect: ', f_entier_hexadecimal(l_cx_precedent));
                    met2(' rel sect: ', f_entier_hexadecimal(l_dx_precedent));
                  end;
            $26 : begin
                    met(' DOS absolute disk write');
                    met2(' dr: ', chr(l_al_precedent+ 64));
                    met2(' dta: DS:', f_entier_hexadecimal(l_bx_precedent));
                    met2(' nb sect: ', f_entier_hexadecimal(l_cx_precedent));
                    met2(' rel sect: ', f_entier_hexadecimal(l_dx_precedent));
                  end;
            $27 : begin
                    met(' DOS terminate stay resident DOS1 ');
                    met2(' dern oct: CS:', f_entier_hexadecimal(l_dx_precedent));
                  end;
            $28..$40 : met(' DOS reserves');
            else met(' ; **************');
          end;
        end; 

      procedure affiche_caractere;
        begin
          case l_operande of
           $03 : met(' ; CTRL-C');
           $08 : met(' ; DEL');
           $09 : met(' ; TAB');
           $0A : met(' ; INTERLIGNE');
           $0D : met(' ; RETURN');
           $1A : met(' ; CTRL-Z');
           $1B : met(' ; ESCAPE');
           $20 : met(' ; ESPACE');
           $7F : met(' ; DEL');
           else
             if (l_operande> $20) and (l_operande<127)
               then met2(' ; ', chr(l_operande));
          end;
        end; 

      procedure recupere_valeur_stockee_dans_registre;
        begin
          case l_code_operation of
            $B0 : begin
                    l_al_precedent:= l_operande_precedent;
                    affiche_caractere;
                  end;
            $B1 : l_cl_precedent:= l_operande_precedent;
            $B2 : l_dl_precedent:= l_operande_precedent;
            $B3 : l_bl_precedent:= l_operande_precedent;
            $B4 : l_ah_precedent:= l_operande_precedent;
            $B5 : l_ch_precedent:= l_operande_precedent;
            $B6 : l_dh_precedent:= l_operande_precedent;
            $B7 : l_bh_precedent:= l_operande_precedent;
            $B8 : begin 
                    l_ax_precedent:= l_operande_precedent;
                    l_al_precedent:= l_operande_precedent and $00FF;
                    l_ah_precedent:= (l_operande_precedent and $FF00) shr 8;
                  end;
            $B9 : begin 
                    l_cx_precedent:= l_operande_precedent;
                    l_cl_precedent:= l_operande_precedent and $00FF;
                    l_ch_precedent:= (l_operande_precedent and $FF00) shr 8;
                  end;
            $BA : begin 
                    l_dx_precedent:= l_operande_precedent;
                    l_dl_precedent:= l_operande_precedent and $00FF;
                    l_dh_precedent:= (l_operande_precedent and $FF00) shr 8;
                  end;
            $BB : begin 
                    l_bx_precedent:= l_operande_precedent;
                    l_bl_precedent:= l_operande_precedent and $00FF;
                    l_bh_precedent:= (l_operande_precedent and $FF00) shr 8;
                  end;
          end; 
        end;