tehsiggi wrote on Yesterday, 10:33:It in fact does. I just collected some info and did some testing on it: […]
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zuldan wrote on 2025-09-23, 19:16:
tehsiggi wrote on 2025-09-23, 17:40:
Found a possible memory tester for R200 based cards. Will verify tomorrow and if successful, add the notes on the usage into the repair collection thread. I'll test a 9100, 9000 and 9200. We'll see..
This would be awesome. I think R6MEMID does older cards than the R300.
It in fact does. I just collected some info and did some testing on it:
Re: VGA Repair report collection
So if anyone needs to memory test R200/RV250/RV280 cards, there is a good way to do it.
Thanks for documenting it 😀 I do have a couple of Radeon 9200 type cards to test so a proper memory tester will help a great deal with that.
In regards to card repair, I've been trying to fix a Radeon HD 4650 AGP that had two resistors knocked off of the back. The pictures online are all not great but I found that the two transistors near the back of the AGP connector connect to the last pin, the VREFGC pin. I think that's for detecting the type of AGP slot its connected to and I have a Sapphire HD 1950 which uses the same AGP to PCI-E bridge. Then I worked out that the transistors and resistors are hooked up just the same on that and the HD4650 to work out that I was missing a resistor marked 17A (147 ohms) and a teeny tiny one at 200 ohms. Gotta test that card out soon, haven't got a good test setup right now for AGP cards.
I've been trying to get my Sony PRD-650 working better, I have awful luck with these. They're really cool tiny SCSI CD-ROM drives but it seems like the laser is always cooked on them, see my attempts to repair a PRD-250: Re: What retro activity did you get up to today?
Got frustrated with that and did some scanning / archiving of documents I've got that aren't online anywhere. I've done this before but was using LibreOffice Draw to make PDF files and didn't know how to optimise the images for PDF usage, so I've been learning how to process the images as 1-bit PNG files and automate the creation of PDF files from those images with OCR. A mix of img2pdf and ocrmypdf have done a fantastic job of putting together space efficient PDF files without manual intervention, once all the images are processed and in the right order. Going over my previous PDFs I was able to get the size of one that was 10MB down to less than 1MB with searchable text and with lossless compression.
Making these PDFs manually is something I've done before but when a document is over 200 pages long, that takes quite a while and has a lot of room for errors to occur.
So now I've shared two new documents I've got that I'm not aware of being online at all til now, those are:
Kapok 6200A (6200AT / 6200AD) user manual, which covers the MMX models and how to set all the voltage / CPU dip switch settings: https://archive.org/details/6200at-user-guide
Toshiba PORTABLE SERVICE BOOKLET - I got this a few years ago on the bay and it's a small handbook covering specs, disassembly and memory maps of Toshiba laptops up to around 1995. I had thought that the maintenance manuals covered all this information already so didn't bother scanning it, til I was fixing a Toshiba T1800 and found that the images showing the screw locations / lengths are all missing from the maintenance manuals.
240 pages covering all these models: T100X, T200 series, T1800, T1850 series, T1900 series, T1900S, T1910 series, T1950 series (same as T1960 series), T2100 series, T2150CD series, T2200SX, T2400 series, T2450CT
https://archive.org/details/toshiba-portable- … e-booklet-vol-1
This is just volume one, Volume Two is longer and covers all these ones: T3300SL, T3400CT, T4400 series, T4500 series, T4600 series, T4700CT, T4800CT, T4850CT, T4900CT, T6400 series and T6600C
I wish I knew how to add bookmark information into these PDF files.
EDIT: Ooh, I can *fix* the maintenance manuals and put those on the Internet Archive too 😁 Just done the Toshiba T1800 maintenance manual successfully which has all the original graphics.
The process is pretty arcane but it works - get the scans from toshiba ATLAS 95, use Irfanview batch convert to make them into PNG because they're crazy fax encoded TIF files. Then use ImageMagick to convert them to 1-bit PNG at the correct DPI, then use img2pdf and ocrmypdf to make a PDF of those. Now to figure out bookmarks!