Re: RL01/RL02 emulator needed -- (was Many thanks to Glen's Vintage Computer Info)
Hi Alan, You don't want to try to repair the controller? There are some custom IC's on there (it appears) but is largely off-the-shelf TTL... I'm sure someone on the list has a lot of experience with these and could repair it or help. -- Pete Rittwage On Tue, Apr 3, 2018 at 00:50, Alan Frisbie via cctech wrote: Several days ago I wrote about my joy of finding a TDL-12 disk controller, emulating four DEC RL02 drives and using a SCSI drive. Sadly, I discovered that the controller is a dead as a doornail. It doesn't respond to any bus address at all. So, I'm back to my original quest: I need a controller that emulates the DEC RLV11/RLV12 and RL01/RL02 drives. From my Google searching, I see a couple that use SD or similar solid state devices. Does anyone here have any direct experience (good or bad) with any of these emulators? I don't mind spending money for a good solution. Thanks, Alan Frisbie
Re: RL01/RL02 emulator needed -- (was Many thanks to Glen's Vintage Computer Info)
On 4/3/18 6:25 AM, peter--- via cctalk wrote: > Hi Alan, > You don't want to try to repair the controller? There are some custom IC's on > there (it appears) but is largely off-the-shelf TTL... I'm sure someone on > the list has a lot of experience with these and could repair it or help. Glen comes to mind, and I think he is in SoCal https://sites.google.com/site/glensvintagecomputerinfo/td-systems/tdl-12
Apple B&W CRT monitor popping and clicking
Hi all, Recently booted up my B&W Powermac G3, all came up fine including the 17” CRT monitor. However after a second or so, the monitor gives a ‘popping’ sound and the image on the screen expands then shrinks. This repeats every few seconds. I’m guessing the monitor is on the way out - but as this is a complete B&W system - I wondered what the likely cause is? Thanks
Re: Apple B&W CRT monitor popping and clicking
On Tue, 2018-04-03 at 21:07 +0100, Ian Frost via cctalk wrote: > > Recently booted up my B&W Powermac G3, all came up fine including the > 17” CRT monitor. However after a second or so, the > monitor gives a ‘popping’ sound and the image on the screen expands > then shrinks. This repeats every few seconds. > > I’m guessing the monitor is on the way out - but as this is a > complete B&W system - I wondered what the likely cause is? That sounds like some sort of problem with the EHT supply. If the picture is stable until the first pop and then it expands, that might suggest that the EHT voltage is dropping because of some sort of sudden spark discharge. Does the image also get dimmer/fainter at the same time? Can you see any evidence of arcing inside the monitor when this is happening? I guess it's not impossible that slightly-conductive dust might have built up inside the monitor somewhere to the point where the EHT insulation is compromised and it's flashing over. If that's the problem then a bit of a clean-up might be all it takes to fix it. Needless to say, be careful when cleaning around the EHT. Conversely, if the image was to get initially smaller and then suddenly expand with a "pop", that might suggest that the EHT supply regulation has gone wrong and the voltage is going too high. From what you've described though it doesn't sound as though that's what is happening. p.
Re: Apple B&W CRT monitor popping and clicking
On Apr 3, 2018, at 3:48 PM, Phil Blundell via cctalk wrote: > On Tue, 2018-04-03 at 21:07 +0100, Ian Frost via cctalk wrote: >> >> Recently booted up my B&W Powermac G3, all came up fine including the >> 17” CRT monitor. However after a second or so, the >> monitor gives a ‘popping’ sound and the image on the screen expands >> then shrinks. This repeats every few seconds. >> >> I’m guessing the monitor is on the way out - but as this is a >> complete B&W system - I wondered what the likely cause is? > That sounds like some sort of problem with the EHT supply. https://en.wikipedia.org/wiki/Apple_displays indicates: ….The Apple Studio Display series of CRT displays were available in a 17" Diamondtron and a 21" Trinitron CRT, both driven by an LG-Manufactured chassis. These displays were notorious for faulty flybacks. … [ Would that be consistent with the symptoms, and is there a good way to test? - Mark
Re: Apple B&W CRT monitor popping and clicking
….The Apple Studio Display series of CRT displays were available in a 17" Diamondtron and a 21" Trinitron CRT, both driven by an LG-Manufactured chassis. These displays were notorious for faulty flybacks. … those are both COLOR, aren't they? Not that it couldn't be flyback, but those two would presumably be unrelated to a B&W CRT.
Re: Apple B&W CRT monitor popping and clicking
On 2018-04-03 8:58 PM, Fred Cisin via cctalk wrote: >> ….The Apple Studio Display series of CRT displays were available in a >> 17" Diamondtron and a 21" Trinitron CRT, both driven by an >> LG-Manufactured chassis. These displays were notorious for faulty >> flybacks. … > > those are both COLOR, aren't they? > > Not that it couldn't be flyback, but those two would presumably be > unrelated to a B&W CRT. > They are colour. In this context, B&W means "blue and white", as in the G3 tower (and monitor) colour scheme. Pinstripy if I recall correctly. --Toby
