Re: Building the KLyball D-13
Posted: Thu Jul 02, 2015 12:50 pm
Thanks Dave. I thought it looked right too, but I am not sure. I couldn't even find an example of an FD data write signal on the web.
Given that it is correct, I'm still at a loss as to why an INIT would write only $24 all over a disk. I even tried another drive.
I'll see if I can dig up another cable to see if that might be the problem, but I'm seeing the right voltages when I probe the cable too, so I'm not confident that will help.
I should also put up the code I use and the process.
At the D/C/W/M prompt I choose C then load up the following code which initializes the floppy interface and writes $AA repeatedly to the ACIA.
On the scope, CH1 is connected to Pin-9 of J3.
Ch2 is connected to pin-8 of U69 and is chosen as the source for the scope sync.
Given that it is correct, I'm still at a loss as to why an INIT would write only $24 all over a disk. I even tried another drive.
I'll see if I can dig up another cable to see if that might be the problem, but I'm seeing the right voltages when I probe the cable too, so I'm not confident that will help.
I should also put up the code I use and the process.
At the D/C/W/M prompt I choose C then load up the following code which initializes the floppy interface and writes $AA repeatedly to the ACIA.
Code: Select all
10 FD = 49152
20 POKE FD+1,0
30 POKE FD,0
40 POKE FD+1,4
50 POKE FD+3,0
60 POKE FD+2,255
70 POKE FD+3,4
80 POKE FD+2,255
90 POKE FD+2,127
100 POKE FD+16,3
110 POKE FD+16,88
120 POKE FD+17,170
130 GOTO 120
Ch2 is connected to pin-8 of U69 and is chosen as the source for the scope sync.