Electronics > Repair
What more i can do?
Harry_22:
Perfect!
Could you read EPROM IC15 and IC16 data and send it to me.
222Lab_Test222:
--- Quote from: Harry_22 on November 08, 2024, 07:42:25 am ---Perfect!
Could you read EPROM IC15 and IC16 data and send it to me.
--- End quote ---
How to read and send those?
Do i need something to read those 32 pins ICs.
Harry_22:
Hello everyone!
I would like to summarize all the collected above data.
This is a single-board industrial computer with Intel 486DX2-66 processor and WACOM Tornado-T chipset.
I managed to find pure Tornado-T board without a video adapter. It is here:
https://www.ebay.co.uk/itm/254285333624
Now about the main components:
Tornado-T chipset.
There is almost no information. However, there is also no information about other chipsets of that time.
Along the way, I found an interesting retro site with old Motherboards, CPU, Chipsets etc.:
https://theretroweb.com/
Tornado-T can be imagined as a combination of i82358 - EISA Bus Controller (Host Bus to ISA/EISA Bus Interface) and i82357 - Integrated System Peripheral (DMA, X-Bus Interface to Bios, RTC, Speaker).
RTC (real time clock)
It is placed in D4900 and supplied with 3V from the battery.
Battery-backed CMOS RAM for BIOS data
Not installed here.
note:
CMOS BIOS memory contains 128-bytes of battery-backed SRAM as standard. On ISA systems, the layout looks like this:
16 bytes - Real Time Clock
32 bytes - ISA configuration data
16 bytes - BIOS specific configuration data
This information is usually placed in RTC with inside battery like DS12887 or in the chipset like i82371.
To reset BIOS, you would temporarily move three-position jumper to the ground.
DRAM Memory
Sim1
“non-volatile” storage like HDD
Sim2 – Flash memory
BIOS
This is what we were looking.
It is located in the UV-EPROM chips before MS-DOS.
Just have seen that the labels on UV-EPROMS have the same Revision KDX.1.34A as the Bios version on the display.
The last experiment with removing the UV-EPROM on worked board gave the same results – the speaker beeps continuously like on broken board.
This is probably the built-in Tornado-T function to beep in case of a boot error.
So in our case no BIOS configuration data is stored and there is no such thing as "entering BIOS".
The required configuration is set by onboard jumpers.
The date and time may be adjusted each time you start the computer.
Is everything correct? Or did I miss something?
Any comments are welcome!
PS
--- Quote from: 222Lab_Test222 on November 08, 2024, 07:59:46 am ---
--- Quote from: Harry_22 on November 08, 2024, 07:42:25 am ---Could you read EPROM IC15 and IC16 data and send it to me.
--- End quote ---
How to read and send those?
Do i need something to read those 32 pins ICs.
--- End quote ---
There are no need to read them any more.
Now I know that BIOS is inside.
Harry_22:
Chеck the signals Chip Enable and Output Enable (please see the picture).
It would be good to compare them with the working board.
222Lab_Test222:
--- Quote from: Harry_22 on November 08, 2024, 11:38:09 pm ---Chеck the signals Chip Enable and Output Enable (please see the picture).
It would be good to compare them with the working board.
--- End quote ---
They are all good, Except there is no volatges in A pins which are input pins in Non working board, Thats the case i am mentioning from the start of this forum.
Other is everything good.
Ps
When I check where some of those pins connecetd they are connected to near tornado IC and few of them to other ICs
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