Not sure it is. I have busted out the scope to look at the data lines. You can see the drives 6502 data lines with a little data, but then it resets and tries again. I also have been going over the schematics looking for broken traces. Nothing so far. Does anyone know how to disable this internal drive per chance? 128DCR
Does anyone know how to disable this internal drive per chance? 128DCR
I can't remember right now. I have a switch mounted to the front of my DCR so that I can disable the internal drive. Perhaps a quick e-mail to Ray Carlsen would be faster than my getting out the DCR and opening it.
Thank you all super kindly! So last night, I mide it somewhere fixing the issue. Looking at the schematics here: www.zimmers.net/anonftp/pub/cbm/schematics/computers/c128/c128dcr-5-left.gif I went from pin 25 on U101 to pin 9 on U113 (74ls14, center on the schematic) and pin 8 on U113 to pin 22 on U102. Both were about 1.2K and 1.5K ohms. Running a temporary jumper between these made the drive work, temporally. Removing one or the other made it stop working again. I was able to read data from a disk, and even an external drive #9. After a few power cycles we are back to the drive running non stop and not working. Any ideas? Thanks again!