When an FCC ID is present it can often times lead to some useful information, though not always.

in this case it leads to https://fccid.io/AMPJD144
which just mentions

Jean Co Ltd Color Monitor Maximum resolution: 1024 X 768 non-interlaced. JD144

enjoy

weedeewee wrote on 2024-10-05, 06:59:

When an FCC ID is present it can often times lead to some useful information, though not always. […]
Show full quote

When an FCC ID is present it can often times lead to some useful information, though not always.

in this case it leads to https://fccid.io/AMPJD144
which just mentions

Jean Co Ltd Color Monitor Maximum resolution: 1024 X 768 non-interlaced. JD144

enjoy

Wow! How did this page work for you? 😁 I tried the same thing yesterday and it found no results with Grantee Code: AMP and Product Code: JD144.
Much appreciated!

I'll do one better , I think I found the original Web page for the crt

https://web.archive.org/web/19980124094743/ht … om.tw/ana14.htm

Seems to have all the specs and stuff.

AppleSauce wrote on 2024-10-05, 07:10:

The attachment Screenshot_20241005-170937_Chrome.jpg is no longer available

Seems to have all the specs and stuff.

The four variants differ in...... "Container Loading 20' / 40'"? Never seen a company lists its product specs with how many units a container can load up until now.

dormcat wrote on 2024-10-05, 07:26:

AppleSauce wrote on 2024-10-05, 07:10:

The attachment Screenshot_20241005-170937_Chrome.jpg is no longer available

Seems to have all the specs and stuff.

The four variants differ in...... "Container Loading 20' / 40'"? Never seen a company lists its product specs with how many units a container can load up until now.

Not sure thats pretty odd , maybe to help inform companies buying palettes of them? , but I'm pretty sure they'd tell them that stuff in private.

It does show my JD144F there, at least I know the supported resolution. But I can't find the maximum refresh rate it can handle, the default 60 Hz gets on my eyes. I remember in the 90s I had a small software piece which allowed me to use 75-85 Hz on Win95 (the monitor itself was from the same era as this one here, same size, but a different model). A friend's computer didn't support it, my attempt to get the refresh rate higher resulted in totally messy graphics that looked like a colorful and fast moving woven rug.
So I guess I'll just try it. 800x600 resolution is plenty fine for a 14" display, I hope I can get it to 75 Hz, and that it won't damage the CRT itself.

SGM wrote on 2024-10-05, 08:24:

It does show my JD144F there, at least I know the supported resolution. But I can't find the maximum refresh rate it can handle, the default 60 Hz gets on my eyes.

If a monitor is specified as "1024 x 768 non-interlaced" without any mention of a refresh rate, it is quite likely that the monitor supports only 60 Hz at that resolution, at a horizontal frequency of 48kHz. The good news is: This kind of monitor usually supports 800x600 at 72 Hz or 75 Hz as well, as these modes do not exceed 48kHz horizontal frequency, which can yield a nice flicker-free image. If your Windows 95 graphics driver is nice, it will offer these refresh rates in the advanced settings panel of the display properties. If you can't get Windows 95 to change the refresh rate at 800 x 600, try looking for a DOS setup utility for your graphics card that can be run from AUTOEXEC.BAT to set the default refresh rate for certain modes/resolutions.

Dang, I know I could look it up... :-p , what's the formula again ?

Horizontal frequency is listed, 30 to 50 kHz
Vertical frequency is listed, 50 to 90 Hz
and bandwidth is listed, 70 MHz

ok so pretty basic & way off it seems Hpixels * Vpixels * refresh = dotclock (bandwidth)
but
visible Hpixels & Vpixels are 1024 x 768 ,
yet there's invisible ones that include the front porch, backporch, sync puls etc...
Hpixels 1344 * Vpixels 795 (blatantly stolen from the standard modeline calculator)
so max refresh, according to specifications on this monitor at 1024x768 would be ... . around 65 Hz

edit: max refresh for 800x600 would theoretically be 103Hz, but since the max for the monitor is specified as 90Hz, I'd keep it at 90Hz max @ 800x600
oh yeah missed the max Hfreq . meh, stick to what mkarcher said 😀 (max 79 ~ 80Hz)

SGM wrote on 2024-10-05, 08:24:

It does show my JD144F there, at least I know the supported resolution. But I can't find the maximum refresh rate it can handle, the default 60 Hz gets on my eyes. I remember in the 90s I had a small software piece which allowed me to use 75-85 Hz on Win95 (the monitor itself was from the same era as this one here, same size, but a different model). A friend's computer didn't support it, my attempt to get the refresh rate higher resulted in totally messy graphics that looked like a colorful and fast moving woven rug.
So I guess I'll just try it. 800x600 resolution is plenty fine for a 14" display, I hope I can get it to 75 Hz, and that it won't damage the CRT itself.

Only one specified is 1024x768 @60Hz - https://web.archive.org/web/20020414160506id_ … ain/spc-14c.htm

PC Hoarder Patrol wrote on 2024-10-05, 10:43:

Only one specified is 1024x768 @60Hz - https://web.archive.org/web/20020414160506id_ … ain/spc-14c.htm

The attachment Jean JD144 series.jpg is no longer available

Someone calculated here, at 800x600 it should handle 75 Hz too, even if it can't do that at 1024x768. 😀

EDIT:
I finally installed the ATI Rage II driver (I finally found it online) and now my Windows 95 runs at 800x600 @75Hz with that CRT monitor, True Color, all quite nice and feels nostalgic. 😀