Hallo Marko, Piotr, Studying the SCH of the 1541-II (1541-II.340503.gif on FUNET) there only 4 lines running to U12, the R/W Amplifier: 1- PowerOn 2- Read Data 3- Write Data 4- EG/NG ??? We can skip the first one. If we assume that 2 and 3 are the datastreams from/to the head, then 4 must be the signal telling U12 that there is a read or write action going on. If 4 has another meaning, then output 3 of U11 can be used. This output delivers the pulses to be send to the haed IMHO. An extra buffer plus the LED could show us these pulses. If the pulses are to short, one can add a mono-stable multivibrator like the 74LS221 that enables the LED to light longer then the actual pulse. ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.1.