masteries
Member
Greetings,
Currently I am in toruble with one of my Apple IIc computers:
=>It turns out that on one of the Apple IIcs, the oldest one, which originally came with ROM 255 and I updated it to ROM 4X (it is a French PAL model), it has stopped recognizing any SmartPort device that I connect (SmartPort I have a UniDisk 3.5 floppy drive and the Fujinet); On the other hand, it reads well from its internal floppy drive (I know it's not SmartPort, it's Disk ][ , but if I'm not mistaken, the IIcs share the chip that controls them, the IWM). I have verified, thanks to Fujinet, that the initialization message does reach the SmartPort devices, but they are left waiting for the REQ signal, once the SmartPort devices send a packet in response to the SmartPort initialization). He also tried with official ROM3 and ROM4, but the result is the same, it points to a hardware failure on the motherboard.
=>On the other Apple IIc, all the SmartPort devices work fine, both the Fujinet and the UniDisk 3.5, so I know the peripherals are healthy and operational.
The failure seems strange, I read about Apple IIc that stops operating both internal and external floppy drives, but in this case it seems very selective... as if something associated that intervenes in SmartPort mode failed.
*The first thing I checked were the contacts of the DB19 connector, in case one was failing, and since they are replicated in the internal floppy drive connector, I was able to verify that there is continuity between the DB19 signals and the internal IDC 20 port.
Any possible guidance?
Thanks in advance,
Currently I am in toruble with one of my Apple IIc computers:
=>It turns out that on one of the Apple IIcs, the oldest one, which originally came with ROM 255 and I updated it to ROM 4X (it is a French PAL model), it has stopped recognizing any SmartPort device that I connect (SmartPort I have a UniDisk 3.5 floppy drive and the Fujinet); On the other hand, it reads well from its internal floppy drive (I know it's not SmartPort, it's Disk ][ , but if I'm not mistaken, the IIcs share the chip that controls them, the IWM). I have verified, thanks to Fujinet, that the initialization message does reach the SmartPort devices, but they are left waiting for the REQ signal, once the SmartPort devices send a packet in response to the SmartPort initialization). He also tried with official ROM3 and ROM4, but the result is the same, it points to a hardware failure on the motherboard.
=>On the other Apple IIc, all the SmartPort devices work fine, both the Fujinet and the UniDisk 3.5, so I know the peripherals are healthy and operational.
The failure seems strange, I read about Apple IIc that stops operating both internal and external floppy drives, but in this case it seems very selective... as if something associated that intervenes in SmartPort mode failed.
*The first thing I checked were the contacts of the DB19 connector, in case one was failing, and since they are replicated in the internal floppy drive connector, I was able to verify that there is continuity between the DB19 signals and the internal IDC 20 port.
Any possible guidance?
Thanks in advance,
