Sounds like likely a simple mechanical problem of bent pins not making good contact. Do all the pins in the socket make good contact with the rom?
You obviously didn't do anything too bad like kill the 5v supply in the 102 or kill the chip if both the 102 still runs and the chip still works in other machines. One thing you can do just to verify the mechanical contact between the socket and the rom is, just insert the rom and continuity test each pin from the socet to the rom adapter. There is enough socket pin still exposed to touch a meter probe to the socket pin whike the rom is plugged in, and you should be able to get the other meter probe to touch the pad on the rom adapter without touching the socket pin if you're careful, or touch the pin on the chip but remember to account for the pin re-mapping for some pins. Basically individually test the continuity from the socket to the chip adapter for each pin. Another thing you can do to test the electronics feeding most pins inside the 102 without taking everything apart, is check with a continuity tester setting on a multimeter, between equivalent pins on the option rom socket and the system bus connector on the back. Only a couple pins like /CS and /OE are going to be isolated just to the socket. vcc, gnd, address and data lines are all shared. Get the pinouts for both ports from the service manual https://archive.org/details/tandy102servicemanual/page/n27/mode/2up Wow, Never noticed the 102 service manual barely even mentions the option rom socket. No pinout or interface description like all the other ports. But you can get the pinout from the schematic, top center page 68, and the system bus over to the right same page. So you can see AD0 is pin 11 on the optrom and pin 5 on the bus connector. The ALE, /CS, and /OE pins won't have any copy but the rest will. To test those few pins you'll need more than a meter, you'll need a scope to tell if they pulse while you try to access the opt rom. But at least a cheap toy scope is good enough for these speeds. But that's getting fancy and you can do the simpler stuff first. -- bkw On 11/27/22 08:31, Georg Käter wrote: > Dear all, > > one of my Model 102 does not recognize OPTION ROM or REX anymore. I´ve > tried the moduls > > in a M100 and an other M102 and the modules are working as expected. > > What I did before was trying a self assembled ROM adapter in the OPTION > ROM socket which might > > have cause a shortcut or something else and might finally has destroyed > something. > > Except from this the M102 runs fine so far, but after a CALL63012 the > system just hangs and needs a reset > > Now my question: Which part or pins I can check easily to identify and > solve the problem. > > Thanks in advance for any hints > > Regards > > Georg > > Georg Käter > Gangolfsweg 44 > D-52076 Aachen > Tel. : +49 2408 7194987 > Fax. : +49 2408 7196758 > Mobil : +49 171 4839954 > E-Mail : > > [email protected] > <mailto:[email protected]> > > *Vertraulichkeitsinformation: > *Diese Nachricht ist vertraulich. Die Informationen dieser Nachricht > sind ausschließlich für die persönliche > und vertrauliche Verwendung durch den/die oben genannten Empfänger > bestimmt. Wenn Sie kein beabsichtigter > Empfänger sind, bitte lesen, kopieren und verwenden Sie die Nachricht > nicht. Machen Sie sie nicht anderen > zugänglich. Bitte informieren Sie uns umgehend über den Zustellfehler > und senden Sie die Originalnachricht > per E-Mail an uns zurück. > > *Confidentiality Notice: > *This message is confidential. The information contained in this message > is intended only for the personal > and confidential use of the recipient(s) named above. If you are not the > intended recipient, please do not > read, copy, or use it and do not disclose it to others. Please inform us > immediately of the delivery error > and return the original message to us via e-mail. bkw
