Thå Retriever Iæ  yoõ  havå eveò trasheä á microcassettå bù  inadvertentlù DIRINITializinç á tapå witè usefuì fileó oî it¬ oò havå otherwiså rendereä á tapå uselesó bù corruptinç itó directory¬ theî wå havå somethinç  foò yoõ ...®  Thå Retriever®  Writteî iî  BASIà thió prograí  accomplisheó  somethinç  eveî thå programmeró  aô  Epsoî Americá couldn't» thå recoverù oæ fileó froí á microcassettå witè aî eraseä oò unreadablå directory. Thå  procesó  Thå Retrieveò useó tï  recoveò  thå  directorù requireó operatoò assistance® Thå program"plays¢ thå tapå oî thå PX-¸ speaker®  Thå starô anä enä oæ files¬ aó welì aó thå recorä counô  oæ eacè filå arå indicateä bù tonå differenceó iî whaô yoõ heaò  froí thå speaker®  Bù depressinç thå  requireä  keys¬  thå operatoò  indicateó tï thå prograí thå start¬  numbeò oæ records¬ anä enä oæ eacè filå oî thå tape®  Operatoò countinç oæ  recordó ió  necessitateä  becauså thå differenô modeó oæ  tapå  operatioî (stoð  anä  non-stop©  uså differenô  amountó  oæ  tape¬  therebù renderinç  anù formulá foò determininç recordó froí thå tapecounô worthless®  Thå  prograí  theî verifieó eacè filå anä  writeó  á directorù  oæ thå fileó (witè thå generiã nameó  F1.RET¬  F2.RET¬ F3.REÔ etc© tï thå tape® Thå softwarå itselæ ió menõ driveî anä quitå easù tï follow® Yoõ  mighô  wanô tï firsô listeî tï á tapå beinç  playeä  withouô tryinç  tï inpuô anythinç tï thå prograí tï familiarizå  yourselæ witè  thå  soundó  thaô yoõ wilì  hear®  Also¬  becauså  oæ  thå constanô  uså  oæ thå speakeò anä cassettå drive¬  iô  ió  almosô necessarù  tï havå thå batterù chargeò pluggeä iî wheneveò  usinç Thå  Retriever®  Thå prograí caî noô recoveò datá thaô haó  beeî magneticallù  altered¬  noò  wilì iô functioî witè  á  physicallù damageä tape. Eveî   witè   thå  safetù  featureó  foò   tapå   operationó implementeä  oî thå reviseä operatinç systeí foò  thå  PX-8¬  Thå Retrieveò  ió á prograí thaô nï PØ owneò shoulä bå without®  Yoõ maù  neveò  neeä tï uså it¬  buô thaô onå timå yoõ dï  makeó  thå bargaiî  basemenô  pricå oæ $9.5° á wiså  investment®  Foò  morå informatioî oò ordering¬  contacô WHALESONÇ  SOFTWARE¬  P.O®  Boø 1183¬ Frankliî PÁ 16323 (412-376-3627). Installinç Turbï Pascaì Oî thå PX-8 Onå  oæ thå mosô populaò softwarå productó oæ 198´ waó Turbï Pascaì froí Borelanä International®  Thå followinç  instructionó indicatå thå installatioî procedurå foò usinç thió prograí oî thå PX-8®  Thå  licensinç  agreemenô foò thå softwarå doeó  indicatå thaô  thå packagå maù bå useä oî onlù onå CPU®  Borelanä  stateó thaô theù arå noô againsô thå transfeò anä uså oæ Turbï Pascaì oî thå  PX-¸ aó lonç aó onlù onå copù oæ thå prograí ió  operationaì aô anù onå time®  Theù werå eveî curiouó abouô thå  installatioî stepó themselves. Alì   oæ   thå  useò  inpuô  containeä  iî   thå   followinç instructionó  wilì  bå thaô BETWEEÎ thå doublå  quotatioî  marks® Usinç thå installatioî prograí Borelanä provideó witè Turbo¬  yoõ wilì firsô bå presenteä witè á selectioî oæ abouô 3° terminaló tï choså  froí foò thå installation®  Selectioî 2± shoulä bå "Soroã Š120¬  Applå CPM"¬ anä ió thå propeò choicå foò PX-¸ installation® Theî  yoõ arå askeä iæ yoõ wanô tï modifù thió definitioî  beforå installation® Answeò witè á "y"® Enteò "PX-8¢ oò "Epsoî PX-¸ -- Ain'ô  iô Great¢ foò thå terminaì type®  Nexô comeó  aî  inquirù abouô  sendinç aî initializatioî strinç tï thå terminal®  Answeò "y"® Yoõ wilì enteò thå followinç aô thå 'Changå to:§ prompt:"2· 20¸ ° 4° ¸ 2· 20¹ ± 2· 24³ ´ 1¹ µ 2´ 0"® Nexô  yoõ musô changå thå reseô strinç iî á similaò  manner® Answeò "y¢ tï thå 'Senä reseô strinç tï thå terminal?§  question® Enteò  "2· 20¹ ° 2· 24³ 2¸ 2¹ 3° 31¢ aô thå 'Changå to:§  prompt® No÷  yoõ  maù  jusô hiô thå "RETURN¢ keù (acceptinç  thå  defaulô values©  foò thå remaininç questionó untiì yoõ seå thå onå  abouô screeî length®  Oæ courså yoõ wilì inpuô "8¢ foò thió one® Wheî finished¬  thå prograí wilì asë yoõ iæ thå definitioî ió correct® Á  negativå  answeò wilì senä yoõ througè  thå  procedurå  again¬ whilå  á positivå onå wilì illiciô á questioî abouô thå naturå oæ thå hardware®  Yoõ wilì bå askeä foò thå operatinç frequencù  oæ youò  microprocessor®  Answeò  "3¢ tï thió anä theî  "Q"uiô  thå installatioî prograí anä yoõ shoulä havå Turbï Pascaì operationaì oî  youò PX-8®  Morå experienceä useró caî theî uså DDÔ oò PATCÈ (á  versioî oæ PATCÈ ió oî thió monthó tape© tï removå thå  extrá linå  feedó froí thå Turbï menuó sï thaô theù wilì appeaò oî  onå screen® PFK OFFSET equ 6CH ;PUTPFK BIOS routine offset from WBOOT ON equ 0 ;Value for pfk display ON OFF equ 1 ;Value for pfk display OFF DISPLAY equ OFF ;Set display to ON or OFF for pfk display BDOS equ 5 PRINT equ 9 org 0100h lxi d,disppfk mvi c,print call bdos ;Send the display string to the console lhld 1 ;Get BIOS WBOOT address mov a,l adi offset ;get address of the PUTPFK BIOS call mov l,a shld putpfk+1 ;modify the call address mvi c,0ffh lxi h,pfk1 loop: inr c mov a,c cpi 10 rz push b push h putpfk: call 0000 ;<----MODIFIED ADDRESS!!!!! pop h pop b mov a,m ;get string length add l Š inr a mov l,a ;put computed string length back jmp loop disppfk:db 1bh,0d3h,display,'$' ;Function key display on/off pfk1: db pfk2-pfk1-1,'dir ' pfk2: db pfk3-pfk2-1,'type ' pfk3: db pfk4-pfk3-1,'c:stat ' pfk4: db pfk5-pfk4-1,'c:pip ' pfk5: db pfk6-pfk5-1,'battery',0dh pfk6: db pfk7-pfk6-1,'modem t',0dh pfk7: db pfk8-pfk7-1,'modem r ' pfk8: db pfk9-pfk8-1,'modem s ' pfk9: db pfk10-pfk9-1,'c:term',0dh pfk10: db last-pfk10-1,'c:config',0dh last: equ $ end Thå abovå listinç ió thå assemblù languagå codå (referreä tï aó  aî  .ASÍ file© foò á prograí writteî foò thå  PX-¸  bù  Daviä Kozinî  (thå commenô lineó havå beeî removeä tï conservå  space)® Iô  ió á simplå buô verù usefuì prograí whicè redefineó thå  PX-¸ functioî  keys®  Yoõ  caî  seå iî thå taiì enä  oæ  thå  listinç exactlù  ho÷  thå  keyó wilì bå defineä bù thió  versioî  oæ  thå program®  Aó  showî  abovå  iô  ió noô  aî  executablå  program® 'Assembling§  anä  'loading§  thå  abovå  filå  wilì  producå  aî executablå  .COÍ  filå thaô wilì redefinå thå functioî  keyó  aó indicated® Noô  everyonå wilì wanô tï uså thå keù definitionó  useä  iî thió  listing®  Yoõ  maù customizå thå prograí tï youò  needó  bù editinç  thå abovå .ASÍ prograí witè youò owî keù definitionó anä theî assemblinç anä loadinç thió file®  Foò manù PØ owneró  thió presentó á smalì problem¬ however® Thå ASM.COÍ prograí needeä tï accomplisè  thå  'assembling§ ió distributeä onlù oî  thå  systeí disë  thaô accompanieó thå PF-1° floppù disë drive®  Iô ió NOÔ á publiã  domaiî program¬  sï wå caî noô distributå iô tï yoõ oî  á tapå  oæ thå month¬  anä yoõ shouldn'ô bå ablå tï finä iô oî  anù RBBS's®  Thaô  renderó thå abovå prograí quitå uselesó yoõ  havå thå disë drivå oò anotheò CPÍ computeò witè ASM.COM®  Therå ió á publiã  domaiî  versioî oæ ASM.COÍ calleä LASM.COÍ thaô  wå  wilì distributå  oî thió month'ó tapå alonç witè PFK.ASM¬  makinç  thå latteò  filå usefuì tï morå PØ owners®  Yoõ shoulä bå  forwarneä thaô  thå  documentatioî  foò  thå  LASÍ  prograí  assumeó   somå familiaritù  witè ASM®  Iô ió stronglù suggesteä thaô unlesó yoõ arå familiaò witè ASÍ thaô yoõ invesô $15--$2° iî á booë sucè  aó CP/Í anä thå Personaì Computeò (Addison-Wesley¬ ISBÎ 0-201-10355- 9©  bù Dwyeò anä Critchfield¬  oò Thå CPÍ Biblå (Howarä W.Samó  ¦ Co., ISBN 0-672-22015-6) by Waite and Angermeyer. No÷ let'ó gï througè thå customizatioî oæ PFË á littlå  morå thoroughly®  Iæ  yoõ  don'ô  reallù  wanô tï  bå  bothereä  witè learninç alì abouô LASÍ (oò ASM)¬ theså instructionó wilì providå enougè informatioî tï allo÷ yoõ tï customizå PFK® Thå  parô  oæ thå prograí thaô requireó  editinç  ió  listeä Šbelow. pfk1: db pfk2-pfk1-1,'dir ' pfk2: db pfk3-pfk2-1,'type ' pfk3: db pfk4-pfk3-1,'c:stat ' pfk4: db pfk5-pfk4-1,'c:pip ' pfk5: db pfk6-pfk5-1,'battery',0dh pfk6: db pfk7-pfk6-1,'modem t',0dh pfk7: db pfk8-pfk7-1,'modem r ' pfk8: db pfk9-pfk8-1,'modem s ' pfk9: db pfk10-pfk9-1,'c:term',0dh pfk10: db last-pfk10-1,'c:config',0dh Saù yoõ havå á customizeä utilitù ROÍ iî thå É drive¬  makinç thå abovå definitionó worthless®  Enteò WordStaò anä indicatå aô thå maiî  menõ thaô yoõ wisè tï ediô á documenô iî  thå  non-documenô modå  bù hittinç "N¢ anä theî enterinç PFK.ASÍ foò thå  filename® Uså  CTRL-à tï  pagå dowî tï thå parô oæ thå  prograí  indicateä above® Positioî thå cursoò oî thå 'd§ oæ 'dir§ oî thå firsô linå abovå anä enteò baô (foò BATTERY.COM)®  Theî hiô CTRL-Ç ³  timeó tï  deletå 'dir§ (buô noô thå apostrophe)®  Theî spacå pasô  thå apostrophå  anä enteò á commá followeä bù 0dè (whicè indicateó  á carriagå  returî  iî HEX)®  Thå firsô linå shoulä no÷ looë  likå this: pfk1º dâ pfk2-pfk1-1,'c:baô ',0dh PF±  ió no÷ bå redefineä tï bå "c:BAÔ "®  Wå continuå iî thió fashioî tï redefinå PF² tï "c:FILINË ",PF³ tï "c:CONFIÇ  " prompt: A>lams pfk and you will see LINKASM AS OF 7/06/81 PFK ŠPFK 017E 001H use factor 48 input lines read End of assembly Remembeò  wå  arå  usinç  PFK.ASÍ witè  alì  thå  commenô  lineó removed»  oî  thå  unediteä versioî yoõ wilì seå '6³ inpuô  lineó read'®  Iæ yoõ no÷ dï á 'dir§ yoõ wilì seå thå twï fileó createä bù  LASÍ  -- PFK.PRΠ anä PFK.HEX®  No÷ creatå thå COÍ  filå  bù enterinç aô thå 'A>§ prompt: A>load pfk and you will see FIRST ADDRESS 0100 LAST ADDRESS 017D BYTES READ 007E RECORDS WRITTEN 01 and you now have your own customized version of PFK.COM. Let'ó  bacë uð á littlå anä examinå thå twï fileó thaô  LASÍ created®  Lookinç  aô á portioî oæ thå PRÎ filå wå seå  thaô  iô showó    botè   thå   ASÍ   listinç   oî   thå   lefô   anä   thå corresponding maché languagå translatioî oæ thå prograí produceä bù LASM on the right. 006C = OFFSET equ 6CH ;PUTPFK BIOS routine offset from WBOOT 0000 = ON equ 0 ;Value for pfk display ON 0001 = OFF equ 1 ;Value for pfk display OFF 0001 = DISPLAY equ OFF ;Set display to ON or OFF for pfk display 0005 = BDOS equ 5 0009 = PRINT equ 9 0100 org 0100h 0100 112A01 lxi d,disppfk 0103 0E09 mvi c,print 0105 CD0500 call bdos ;Send the display string to the console 0108 2A0100 lhld 1 ;Get BIOS WBOOT address 010B 7D mov a,l 010C C66C adi offset ;get address of the PUTPFK BIOS call 010E 6F mov l,a 010F 221F01 shld putpfk+1 ;modify the call address 0112 0EFF mvi c,0ffh 0114 212E01 lxi h,pfk1 0117 0C loop: inr c 0118 79 mov a,c 0119 FE0A cpi 10 011B C8 rz 011C C5 push b 011D E5 push h Š 011E CD0000 putpfk: call 0000 ;<----MODIFIED ADDRESS!!!!! Thió  giveó  thå programeò á listinç oæ whaô LASÍ  diä  witè  hió program, and is a valuable debugging tool. Now if we look at the HEX file we will see: a / \ / \ b c d e f g h i j k l m n o p q r / \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ :10010000112A010E09CD05002A01007DC66C6F225F :100110001F010EFF212E010C79FE0AC8C5E5CD0096 :1001200000E1C17E853C6FC317011BD30124046429 :1001300069722005747970652007633A737461747D :100140002006633A70697020086261747465727980 :100150000D086D6F64656D20740D086D6F64656DBD :10016000207220086D6F64656D20732007633A74F8 :0E01700065726D0D09633A636F6E6669670D07 :0000000000 \ / \ / \ / \ / s Each line of the file is organized as follows: aº  Thå  coloî  aô thå beggininç oæ eacè linå indicateó  thå beginninç  oæ  á  record®  Thå firsô ² digitó  afteò  thå  coloî indicatå thå lengtè oæ thå recorä iî HEX® Herå thå recorä lengtè ió  1° HEØ oò 1¶ iî decimal®  Followinç thió arå ´ digitó (0100© thaô telì thå 'loader§ thå startinç locatioî iî memorù wherå  thå machinå codå oæ thå recorä ió tï stored® b-qº Thå prograí peò se» eacè linå containó 1¶ oò 10È byteó (iî   hexadecimaì   code©  oæ  thå  machinå   languagå   program® Correlatå thió witè thå lefô portioî oæ thå PRÎ file. r: Checksum. s: Portion of the data to set the function keys to. Thió  filå ió iî whaô ió knowî aó Inteì Heø format®  Alì oæ  thå characteró  arå  ASCII¬  anä  eacè linå containó  checksuí  erroò detection¬  allowinç  iô tï bå morå  inter-computeò  transferablå thaî á COÍ file®  Iô ió alsï possiblå tï prinô oò vie÷ thió file¬ somethinç thaô cannoô bå donå witè COÍ files®  Thió ió thå  typå oæ filå thaô ió 'burned§ intï ouò personalizeä ROMs® Using the PX from Hotel and Motel Rooms Peteò  Lerô  haó contributeä thå followinç discussioî  whicè describeó  ho÷ tï circumvenô thå unavailabilitù oæ modulaò  phonå jackó  iî  mosô  hoteló anä motels¬  á situatioî  thaô  makeó  iô impossible to use the modem in the PX's MFU. THIS FILE DESCRIBES A SIMPLE, CHEAP ADAPTER TO LET YOU USE THE #39.95 RADIO SHACK PORTABLE ACOUSTIC COUPLER (designed for use Šwith the "Trash-80" models 100 & 200) WITH THE EPSON PX-8 "GENEVA" PORTABLE COMPUTER AND MODEM UNIT OR MULTI-UNIT. It's written in non-technical terms for those out there with little electronics background; bear with me, other technofreaks! INTRODUCTION A significant disadvantage of the Modem Unit and Multi-Unit available for the PX-8 is encountered when travelling: many hotels and motels have telephones hard-wired to the wall, with no modular outlet suitable for direct MODEM connection. The same is true of public telephones. The author has, until now, made use of two cumbersome expedients: 1.) Disassemble the telephone using a Swiss Army Knife and make a direct connection using a cord with a modular phone plug on one end and a pair of alligator clips on the other (impossible with public telephones); or... 2.) Use an external acoustic coupler such as Epson's, which is fairly bulky, requires batteries, costs close to $200, and doesn't work very well. However, the author has noted two interesting facts. One is that the Radio Shack TRS-80 Models 100 and 200 can be used with an optional acoustic coupler consisting of a pair of soft rubber cups with transducers, which fit over the telephone handpiece and which connect to an enigmatic 8-pin DIN plug on the back of the computer; the other is that the PX-8 Modem and Multi-Units have an equally enigmatic miniature phone plug on the back, labelled "acoustic coupler." Some experimentation revealed that the Radio Shack Acoustic Coupler will, in fact, work fairly well with the PX-8. In fact, this file was transmitted with it, as a test. REQUIRED COMPONENTS 1.) Tandy/Radio Shack "Acoustic Coupler for use with Portable Computer," part # 26-3805A; list price $39.95 2.) A miniature (1/8 inch) three-circuit audio plug (Radio Shack part # 274-284 or equivalent); this is the same plug as found on the lightweight headsets used with "Walkman"(tm) type cassette players. 3.) A female 8-conductor DIN connector. This is not currently available at Radio Shack, nor at most audio stores; you'll have to go to a "real" electronics store! 4.) A couple of feet of three-conductor wire; I recommend two conductors plus a shield (e.g., microphone cable). TOOLS REQUIRED knife or diagonal wire cutter, small soldering iron, rosin-core solder Note that for all its humble appearance, the Radio Shack coupler includes an amplifier and requires +5 VDC for proper operation. By a strange coincidence, however, the PX-8 provides just that voltage at the Acoustic Coupler jack! WIRING THE ADAPTER Remove the outer insulation from both ends of the wire; strip the inner insulation from the two conductors and tin their ends, and the last 1/8 inch or so of the copper shield, with solder. Remove the protective shells or hoods from both the miniature and the DIN connector and put them "back to back" at the middle of the wire NOW to avoid forgetting them and having to un-solder one of the connectors later (here speaks the voice of Šbitter experience). Gently pry off the two metal shielding halves at the back of the DIN connector. Looking at the back, orient it so that the gap in the circle of pins is at the bottom. You are going to wire to four of these pins: #6, the one in the center of the plug; #2, the one directly above it at the 12 o'clock position; #4, immediately to the right of #2; and #5, immediately to the left of #2. Remember, this orientation is looking at the BACK of the DIN plug. Solder the outer shield of the wire to pin #2. This is the ground for both the signal and the 5 volt power. Solder one of the inner conductors to pin #5 and note its color; this is the "transmit" line, and will ultimately operate the transducer that goes over the mouthpiece of the telephone handset. Solder the other inner conductor to pin #4, just to the right of pin #2. This is the "receive" line that carries the signal from the transducer that fits over the earpiece of the phone handset...but it also carries the +5 volts DC from the PX-8 to the acoustic coupler. Therefore, solder an additional very short wire from pin #4 to pin #6--the one in the center of the plug. Note the color of the "receive" wire. Now move to the other end of the wire. Solder the outer shield to the "sleeve"--the section nearest the "handle" end--of the miniature plug. The "transmit" line is connected to the "ring," or intermediate section of the plug, and the "receive" line is connected to the tip of the plug. On a Radio Shack #274- 284 plug, the tip is the smallest solder lug in the center, the ring the next largest, and the sleeve the largest lug. Check all your connections, making sure that none are touching one another, and slide the hoods onto the plugs. Plug the acoustic coupler into the adapter you've made, and the adapter into the "acoustic coupler" jack on your PX-8. USING THE ACOUSTIC COUPLER Thus far, I have used the coupler only with the "Geneva Connection" software on the PX-8. Getting it to work seems to require "fooling" the software using the following procedure: 1.) Enter the "Geneva Connection" in the usual fashion. 2.) At the * prompt, enable the internal MODEM by typing PORT INT and a carriage return. 3.) Here's where we "fool" the software by letting it think it's dialling a telephone: at the next * prompt, type DIAL T 1 (or any other single digit) but don't hit carriage return yet. 4.) Put the mouthpiece half of the coupler on the phone handset and, using the dial on the phone, call the other computer. When it answers, and you hear the high-pitched MODEM tone, quickly put the earpiece of the coupler onto the phone and hit carriage return. The Geneva will dial a 1, which doesn't do anything, and if the signal level from the other computer is high enough it will print "SUCCESSFUL" followed by another * prompt. Type TERM plus a carriage return, and you're in business! In some cases, random "garbage" noise may cause Geneva Connection to "lock up" before communication is established. This can be avoided by setting parity to "N" until connection is established, then resetting as required--or can be recovered from Šby exiting TERM mode (using ESC key) and re-entering. The acoustic coupler is quite sensitive to extraneous noise and must be operated per the instructions supplied with it, or data errors will result. It is highly recommended that important or critical material such as programs be transmitted/received using an error-checking protocol such as XMODEM. (NOTE TO EXPERIENCED "GENEVA CONNECTION" USERS: As far as I can tell after only minimal testing, the Geneva Connection needs both to go through the "dial" routine AND a MODEM tone of sufficient level before it will put out its own tone. More experienced or proficient users than me may well be able to circumvent this. Some phone systems may also let you tone-dial through the acoustic coupler. At present, the system works well if there's a good connection, not too much noise on the line, and not too much ambient noise around the coupler--i.e., at least as well as the Epson acoustic coupler!) As supplied by Radio Shack, the Portable Acoustic Coupler has only marginal gain and requires a clear, noise-free phone line and a strong MODEM tone from the other end to work properly. Here's how its gain can be increased. REQUIRED COMPONENTS small 5 KOhm potentiometer, insulated hookup wire REQUIRED TOOLS soldering iron and solder, small Phillips screw driver, needlenose pliers. STEP 1: Peel back edges of rubber cup--this takes a little force--and slide out the plastic back part of the EARPIECE transducer on the Acoustic Coupler. It will come away from the earpiece, leaving the actual tiny transducer in the rubber part. STEP 2: Unscrew the small Phillips screw in the center of the circuit board in the plastic housing and remove it. Carefully disconnect the two polarized plugs linking it to the cable and the transducer (a small electret microphone). STEP 3: On the component side of the board, locate the 4700-ohm resistor marked R5 (last in a row of four; color coded yellow, violet, red, silver or gold). Carefully unsolder this resistor and remove it from the circuit. STEP 4: In place of the resistor you just removed, install a pair of wires and connect them to the 5000-ohm potentiometer, which will be installed on the outside of the plastic housing. (Alternatively, you could install a small trimmer potentiometer right on the component side of the circuit board, and make a hole in the housing to get at it with a screwdriver.) The potentiometer should be wired such that minimum resistance is at the clockwise end of rotation. STEP 5: Reassemble the Acoustic Coupler. TESTING AND USE WITH GENEVA CONNECTION: The idea here is to supply just enough audio so the Geneva Connection knows someone's out there, but not so much that you get distortion and data errors. Start with your new gain adjustment fully counterclockwise. Put the coupler on the phone, call Geneva Connection, command PORT INT to get the MODEM up, then command DIAL T 1 to get into dial mode. Use the phone to dial the other computer while listening on the Geneva speaker. When you hear the other computer's MODEM tone, if Geneva doesn't Šgive you the SUCCESSFUL message in a couple of seconds, slowly start increasing the gain until it does--that's all there is to it! Crude, yet primitive--but, like most kludges, it works...