Does he really need to get an XTIDE to be able to use bigger HDD (or even CF or SD adapter with cards of bigger sizes) above 528MB? I don't think so. The BIOS - if patched - will let him use all brands of drives and CF/SD adapters of his choice, whereas Drive-Overlay software will enable him to use …

Not sure what I have here .. but I ignored the device ID check the programmer software moaned....and performed a read with TL866 .. what I got is in the attached zip .. But did I read the correct chip even ? Ian ..over to you buddy .. saved as a bin file not hex VS I've now had a chance to test …

Details of the adapter leads for a floppy would be useful ..and probably my first job. Here are the construction details for the internal floppy adapter: You will need 34 way and 26 way IDC headers and a 26 way ribbon cable of suitable length Mount the 26 way IDC on one end of the ribbon cable as …

Here are the patched and unpatched versions of the Award BIOS I posted to the other forum (only 528MB change in the patched version) Don't forget that the IDE cable likely has one connector fitted backwards so you can't use the standard cable to plug into another IDE drive without checking that and …

Vipersan wrote: D27C1024D-15 64Kx16 64X16 EPROM CERAMIC DIL 27C1024 150NS 1MBIT will these be suitable Ian..??? I have a few of that exact part number and have been using them when testing BIOS patches so I would say definitely OK as long as your programmer can program them.

what I got is in the attached zip .. But did I read the correct chip even ? Ian ..over to you buddy .. saved as a bin file not hex Didn't realise you had an EPROM programmer, that's useful. It's the right chip and it's a Phoenix BIOS, the one I have is an Award BIOS. I've programmed a 27C1024 with …

Well Ian .. already started when I read your post .. so please take a look at the floppy drive end of my lead ? does it look right ? if not I'll start again .. It looks right but it's difficult to be certain without seeing a closeup of the IDC with the top removed. However when drawing up a list of …

Ordered a couple of 26 pin IDC ..and found an old standard floppy ribbon ..so hopefully I wil soon have a working floppy drive.. fingers crossed Dont forget to make sure the switch on the left hand side of the T5200 is in the "PRT" position when testing your floppy drive. If it's in the "A" …

This is good news for anyone out there that has a T3200/5200 series with a broken proprietary floppy drive, as it means you can successfully replace it with a normal drive. It's fairly straightforward to make up an adapter cable to connect an ordinary floppy drive to the proprietary connector on …

(continued from previous post) One of the machines had 14MB of RAM, the second had 6MB and the last had only the standard 2MB so I modified that one by removing the proprietary SIMM slots from the RAM expansion board and making a small sub board with standard 72 pin SIMM slots. I then wired that to …

I have three of these old orange gas plasma 386 machines and have made various mods and upgrades for them over the years and thought I should document them here in case anyone else is interested in doing the same upgrades. Here is a brief summary of the mods: 1. Fitted CF cards (two different …

1000 uF does sound like a lot. Is the only drawback the capacitor charge time? Did you experiment with values between 100 nF and 1000uF? It would be kinda neat to determine the min. value capacitor needed the correct the hanging issues. It would make the rise and fall times of the +5v a little …

I first soldered to the HLDA pin on the CPU, however I witnessed hanging in the DOOM timedemo. One thing I forgot to mention, when I first got my 486SXL2 working it would randomly freeze in windows NT4, always at similar points during bootup or shutdown but this didn't happen when the cache was …

Did you first confirm that you needed the Flush circuit as described in the TI SXL2 databook? On all the boards I tried, it was not needed, though adding it didn't make things worse. On one board, I remember that adding the Flush circuit just meant that I did not need to use software to enable the …

Well I got the TI486SXL2 working on my T5200 with DMA cache flushing and a20 gate support. Here's a photo of the mods: t5200mod.jpg The blue wire is the A20 gate and the yellow ones plus the IC are the recommended flush circuit from the TI486SXL2 databook (wired for serial cache). I also had to …

Attached are the test files for DMA and A20. Thanks, The A20 test does seem to behave a bit randomly. It also hangs after running the test on my T5200 even with caching disabled. I'll investigate further. Which part numbers do you recommend for a 387 co-processor for the TI486SXL2 and also the …

It also includes a DMA test program and an Gate A20 test program to test cache coherency. The DMA test was successful, however I received only 3 of 4 passes on the test for the Gate A20. Not sure why. Apparently, if you do not connect the A20M# pin from the chipset or the A20Gate# from the KBC to …