There are multiple Tulip TC-44 motherboards. Level 1, 2, 3 AND L4 (versions basically) with different built in video chipset.
Found some BIOS and the only BIOS not found is for TC44 Level 1/2/3 with GD5436 video controller.
These are the variants:
TC44 Level 1/2/3 with GD5434 video controller. TC44 Level 1/2/3 with GD5436 video controller. TC44 Level 1/2/3 with GD5440 video controller.
TC44 L4 with GD5434 video controller. TC44 L4 with GD5436 video controller. TC44 L4 with GD5440 video controller.
So which one do you have ?
The Archive pages did not have any jumpers and those above did not archive those scripts, they never do get archived proper back then....
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun
1... 2 Thursday, June 27, 2002 12:48 PM 667132 BIOSTC44L434.EXE 3 Thursday, June 27, 2002 12:43 PM 722250 BIOSTC44L436.EXE 4 Thursday, June 27, 2002 12:40 PM 723314 BIOSTC44L440.EXE 5 Thursday, June 27, 2002 12:57 PM 242218 BIOSTC44LX34.EXE 6 Thursday, June 27, 2002 12:53 PM 242650 BIOSTC44LX36.EXE 7 Thursday, June 27, 2002 12:50 PM 242476 BIOSTC44LX40.EXE 8...
these two seems to be the right one:
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BIOSTC44L436.EXE = Bios update for Tulip Desktop XX_44 systems with a CL-GD5436 video controller
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BIOSTC44LX36.EXE […] Show full quote
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BIOSTC44L436.EXE = Bios update for Tulip Desktop XX_44 systems with a CL-GD5436 video controller
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BIOSTC44LX36.EXE = Bios update for Tulip Desktop XX_44 systems with a CL-GD5436 video controller
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But BIOSTC44L436.EXE from archive.org seems to be broken... And the question is, for what board revisions these files are...
Think i will capture the current BIOS with GETBIOS.COM
Great ! yes some at download.tulip appear corrupt 🙁
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun
Can you take a picture of the motherboard where the front panel connections are ? The Manual for the TC40 has jumpers but no front connection pins, or it would be a starting point.
Long ago got a Unisys 486 board but no documentation and even with calls to Unisys had to figure out some on my self....
Good news: think I got a newer BIOS for it, will attach it later tonight...
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun
I have a Vision Line dt 5/120 under my desk, so I could probably determine the pinout of the J11 connector with a multimeter, but since my free time is very limited at the moment, you'd probably be faster with trial-and-error.
Be careful shorting any pins. I use a pencil lead (the graphite+clay core has some resistance) to short Reset pins if am not sure and even if I am but too lazy to grab a switch.
It will not hurt a board if you briefly short wrong panel pins with pencil lead due to the resistance.
From your Diag so far HD LED goes 1 to 2, Speaker 9 to 10 (speakers are typically pulled high, not grounded) is that same on your board ???
Looking at the ribbon cable in the picture it is not like typical leads where the speaker is a four pin....If it was it would go 9 to 3 which makes no sense based on your voltages.
So Reset could 3 to 4 and Power On LED could be 8 to 7 (2v diff for a LED) or from 8 to 6 if there is a resistor in line on the board.
There is also a Keyboard lock in there somewhere. Maybe that is 8 to 7 ??
added: the Tulip Vision Line dt 5/120 does not have a Reset button but the pins for it may be there...The Flying Dutchman: Tulip Vision Line dt 5/120 (upgraded)
What volts did you measure from 2 to ground ? If 5v that would be because there is a resistor inline but with out a load it shows full 5volts.... just thinking out loud 😀
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun
added: the Tulip Vision Line dt 5/120 does not have a Reset button but the pins for it may be there...
Exactly, there is no Reset button on the front panel so I'd stop looking for the pin...
The PWR/HDD indicator on the Tulip is a bi-color LED (green and orange). There are different types of those: With two leads (voltage determines color) and with three leads (one GND, one for each color).
Please try and measure the voltage while idle (green) and while accessing the HDD (orange) on pin 02.