Search found 89 matches

by bagpuss22
Wed Mar 27, 2019 11:51 pm
Forum: Hardware
Topic: CST Thor 1 EPROM problem
Replies: 27
Views: 2549

Re: CST Thor 1 EPROM problem

When it did work, for a short time! I got this boot screen.

Image
by bagpuss22
Wed Mar 27, 2019 11:50 pm
Forum: Hardware
Topic: CST Thor 1 EPROM problem
Replies: 27
Views: 2549

Re: CST Thor 1 EPROM problem

I had to repair the same area! Replaced most of it.

Before
Image

After:
Image
by bagpuss22
Wed Mar 27, 2019 4:54 pm
Forum: Hardware
Topic: CST Thor 1 EPROM problem
Replies: 27
Views: 2549

Re: CST Thor 1 EPROM problem

Looking at the 2 rom images, mine on the left and your on the right, the layouts are similar and do
contain the key number written on the label.

Will need to check mine as yours seems to be 8K and mine 16K.......

Image
by bagpuss22
Wed Mar 27, 2019 12:07 pm
Forum: Hardware
Topic: CST Thor 1 EPROM problem
Replies: 27
Views: 2549

Re: CST Thor 1 EPROM problem

Hi there,

I will dig the ROM images out later..

When back-powering the CST QL mainboard, are you just applying just the +5v ?

I have to get back into the swing of this lol..

I need to test my board away from the CST expansion, after applying 9v! DOH!

Russ
by bagpuss22
Fri Nov 24, 2017 7:15 pm
Forum: Hardware
Topic: Minerva Rom burning
Replies: 10
Views: 2111

Re: Minerva Rom burning

I have the Minerva 1.97 and Toolkit II 2.20 ROM image if you want me to send it.

PM me your email and I can do that...

BP
by bagpuss22
Wed Nov 08, 2017 11:57 pm
Forum: Hardware
Topic: Anyone with a psu for Microperipherals Floppy Interface?
Replies: 45
Views: 14450

Re: Anyone with a psu for Microperipherals Floppy Interface?

Tonight I measured the voltages out of the official PSU on the 4 cables that are showing, as on mine the 6 pin DIN plug is missing! I got the following: Red - Green 16.2v AC Blue - White 9.9v AC SO my only assumption is that the label is not telling us the whole truth and the earlier wiring diagram ...
by bagpuss22
Thu Nov 02, 2017 11:22 pm
Forum: Hardware
Topic: Anyone with a psu for Microperipherals Floppy Interface?
Replies: 45
Views: 14450

Re: Anyone with a psu for Microperipherals Floppy Interface?

Did we get anywhere with the pinout for this?

15vac and 9v dc

Thanks

Russ
by bagpuss22
Wed Oct 11, 2017 12:29 am
Forum: General QL Chat
Topic: Bad evenings repairs
Replies: 10
Views: 2904

Re: Bad evenings repairs

@Derek, You are correct and that is what has happened, 9v on the 5v line. I did not realise CST put the link in. JUst trying to ascertain what is damaged and what is not. So far 4 x DRAM and a 8049 destroyed, not checked the 8302 yet. Once I know they are all working then I will move onto the logic....
by bagpuss22
Wed Oct 11, 2017 12:19 am
Forum: Compatibles Corner
Topic: CST Thor 1
Replies: 75
Views: 21986

Re: CST Thor 1

I am hoping that I may not have to change too much. My worry would be, if the board would be
better scrapped or rebuilt!

:?
by bagpuss22
Sun Oct 08, 2017 9:09 pm
Forum: Compatibles Corner
Topic: CST Thor 1
Replies: 75
Views: 21986

Re: CST Thor 1

It was a shorting link put in by CST, by the main connector!

So far I have had to replace the 4 x DRAM and the 8049, just the ZX8302 to check and then
maybe some power can be applied.