I got my LSI-11 boot from the HxC2001 SD card FDD emulator with non-DEC RX02 equivalent I/F, but I still have problem.
I have two models of non-DEC RX02 equivalent FDD I/F. One is the Q-bus quad-width board with the "FX02" model name (manufacture unknown). Another is the Q-bus dual-width board with the manufacture name, "Data Systems Design", model unknown. Latter seems to be different from DSD 440. They are shipped with Y-E Data YD-180 & YD-174, 8" double side, double density FDD w/o VFO.
Because RX02 format is not usual MFM, I tried only Rx01 format. I created empty IBM FM disk image and tested it.
First, I connected the HxC2001 to the "FX02" I/F. It works fine for me. DIR, INI and COPY commands work without error. I made RT-11 boot disk and it works, that is, boot from the SD card.
Then, I connected the HxC2001 to the Data Systems Design's I/F, but it has problem.
INI and INI/BADBLOCK works, but COPY doesn't work. When I execute INI and COPY, the track number on the LCD of HxC2001 is always 0 or 1. Only when I execute INI/BADBLOCK, the track number increases from 0 to 76. I guess there is some trouble on the step operation, but I have not yet found answer.
I am checking signals between I/F and FDD. The WRITE DATA pulse seems to be dirty. Here is the recorded pulse.
I am not sure of reason for dirty wave shape of the WRITE DATA signal. Of course, my poor probing can be possible reason.
I will try and want to make this I/F work with the HxC2001 emulator.
coredump
I have two models of non-DEC RX02 equivalent FDD I/F. One is the Q-bus quad-width board with the "FX02" model name (manufacture unknown). Another is the Q-bus dual-width board with the manufacture name, "Data Systems Design", model unknown. Latter seems to be different from DSD 440. They are shipped with Y-E Data YD-180 & YD-174, 8" double side, double density FDD w/o VFO.
Because RX02 format is not usual MFM, I tried only Rx01 format. I created empty IBM FM disk image and tested it.
First, I connected the HxC2001 to the "FX02" I/F. It works fine for me. DIR, INI and COPY commands work without error. I made RT-11 boot disk and it works, that is, boot from the SD card.
Then, I connected the HxC2001 to the Data Systems Design's I/F, but it has problem.
INI and INI/BADBLOCK works, but COPY doesn't work. When I execute INI and COPY, the track number on the LCD of HxC2001 is always 0 or 1. Only when I execute INI/BADBLOCK, the track number increases from 0 to 76. I guess there is some trouble on the step operation, but I have not yet found answer.
I am checking signals between I/F and FDD. The WRITE DATA pulse seems to be dirty. Here is the recorded pulse.
I am not sure of reason for dirty wave shape of the WRITE DATA signal. Of course, my poor probing can be possible reason.
I will try and want to make this I/F work with the HxC2001 emulator.
coredump