Search found 58 matches
- Sat Mar 09, 2013 10:05 am
- Forum: Hardware
- Topic: Ql problem
- Replies: 25
- Views: 15425
Re: Ql problem
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...
- Sat Mar 09, 2013 9:11 am
- Forum: Hardware
- Topic: Ql problem
- Replies: 25
- Views: 15425
Re: Ql problem
Any suggestions as to where I should start checking?
Thanks
Tassos
Thanks
Tassos
- Sat Mar 09, 2013 12:02 am
- Forum: Hardware
- Topic: Ql problem
- Replies: 25
- Views: 15425
Ql problem
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...
- Mon Mar 04, 2013 9:31 pm
- Forum: Hardware
- Topic: Micro peripherals Drive controler?
- Replies: 39
- Views: 20038
Re: Micro peripherals Drive controler?
haha I think I will need a chinese dictionary.......... it's all Greek to me
Tassos
Tassos
- Mon Mar 04, 2013 8:33 pm
- Forum: Hardware
- Topic: Micro peripherals Drive controler?
- Replies: 39
- Views: 20038
Re: Micro peripherals Drive controler?
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
Thanks
Tassos
- Sat Mar 02, 2013 10:11 am
- Forum: Hardware
- Topic: Micro peripherals Drive controler?
- Replies: 39
- Views: 20038
Re: Micro peripherals Drive controler?
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
Thanks again Tassos
- Fri Mar 01, 2013 8:52 pm
- Forum: Hardware
- Topic: Micro peripherals Drive controler?
- Replies: 39
- Views: 20038
Re: Micro peripherals Drive controler?
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...
- Fri Mar 01, 2013 1:00 am
- Forum: Hardware
- Topic: Micro peripherals Drive controler?
- Replies: 39
- Views: 20038
Re: Micro peripherals Drive controler?
@ 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
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
- Thu Feb 28, 2013 5:45 pm
- Forum: Wanted
- Topic: Wanted Floppy Interface for QL
- Replies: 0
- Views: 2177
Wanted Floppy Interface for QL
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
Thanks in advance
Tassos
- Wed Feb 27, 2013 8:23 pm
- Forum: For Sale
- Topic: Seen on eBay
- Replies: 155
- Views: 78346
Re: Seen on eBay
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
Tassos