alan8086
Experienced Member
Hi All - I'm thinking of buying said terminal. It appears functional - displays text on the screen etc. However - there is a vertical green line to the left of the text from top to bottom. I have some experience of repairing TVs from the 1970's/80's at a hobbyist level, as a teenager - its been a while though.
What would cause one green line on an otherwise flawless raster? At first I thought rather than the CRT geometry circuitry, could it be perhaps the VDU IC/circuitry or perhaps a RAM issue if the screen layout is bitmapped or something?
Having since read some of the service manual - the screen is 'drawn' per horizontal sweep according to the layout of the character map currently in use. As the vertical line is to the left of the normal block of 24x80 characters, perhaps it is more of a CRT control geometry issue - rather than a logic issue on the motherboard?
I have an IMS 8000 S100 box, bought off its original owner about 12 years ago. He had a Lear Siegler ADM-3A terminal originally but that wasn't part of the sale. Its always seemed a shame to use HyperTerminal on an LCD screen with this venerable machine from 1980.
If anyone has any suggestions from the scant info I've provided -I'd appreciated it!
Thanks ;-)
What would cause one green line on an otherwise flawless raster? At first I thought rather than the CRT geometry circuitry, could it be perhaps the VDU IC/circuitry or perhaps a RAM issue if the screen layout is bitmapped or something?
Having since read some of the service manual - the screen is 'drawn' per horizontal sweep according to the layout of the character map currently in use. As the vertical line is to the left of the normal block of 24x80 characters, perhaps it is more of a CRT control geometry issue - rather than a logic issue on the motherboard?
I have an IMS 8000 S100 box, bought off its original owner about 12 years ago. He had a Lear Siegler ADM-3A terminal originally but that wasn't part of the sale. Its always seemed a shame to use HyperTerminal on an LCD screen with this venerable machine from 1980.
If anyone has any suggestions from the scant info I've provided -I'd appreciated it!
Thanks ;-)