The Sinclair QL Forum

I am waiting for an eprom programmer in order to burn the minerva rom, I have already made the PCB mentioned in another post. I also found this in the service manual "If RESET is pressed and a 'tweed' pattern is seen on the screen for a certain time and it then reverts to white, this suggests t...

Any suggestions as to where I should start checking?
Thanks
Tassos

Hi I received a QL board issue 5 that was missing the zx8301 and the 68008 which I replaced (Thanks to Rich for providing it.). The problem is that when powered on and after the initial colored memory pattern I am faced with a totally white screen, no pattern no lines , just white. From what I found...

haha I think I will need a chinese dictionary.......... it's all Greek to me
Tassos

Hi I am trying to find schematics or a service manual for the MicroPeripherals/Sinclair I/F , I am trying to figure out what is the purpose of the variable resistor and the variable capacitor on the PCB.
Thanks
Tassos

Already ordered a tms2793 and a wd2793, (I hope thats where the problem is) I will keep everyone informed when they arrive .
Thanks again Tassos

Ok I checked all the lines and the ones that stay constantly high when giving the dir flp1_ are: 18 DIR (dir step direction) 20 STEP (step pulse) 30 RDATA (read data) 32 SIDE1 The rest of the lines behave as expected I guess there is a problem in head seeking, am I in the correct direction? That can...

@ Dave
I checked with a multimeter the cable while I gave the "dir flp1_" command and the only thing that seems strange to me is that in pin 20 step there is only 5v no matter what . I would expect to give a step low during the command or am I totally wrong?
Tassos

Hi since my I/F doesn't work and I am not sure if I can manage to fix it I am looking for a disk Interface for my QL.
Thanks in advance
Tassos

I guess the previous owner treasured his QL items and stack them somewhere underground while drawing a pirate map in order to rediscover them 30 years later and auction them out at e-bay.....dirt included
Tassos