Solved How to let DOM SSD work on 486 motherboard?

May 9, 2018 at 06:18:43
Specs: DOS 6.0, 486 DX33 / 4MB
Hi! It's my first post here. I'm not good at English, but I do need your help. I am working on an old steel manufacture, and my job is to maintain the machines. I have to keep a motherboard (INTEL pSBC 486DX33) work properly, but the hard disk (<512MB) breaks frequently. I try to use SSD (256MB, Transcend PATA PTM520 Flash Module) to replace HDD, but it can not boot. The system OS is DOS 6.0. and it seems the BIOS can not find this SSD, because after check memory, the screen shows no disk can be found. According to the SSD menu, it supports PIO mode, so I think it can work. What else should I do? Thank you.

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✔ Best Answer
May 9, 2018 at 09:08:38
According to the SSD datasheet: https://www.transcend-info.com/File...

"Supports up to Ultra DMA Mode 4
Supports PIO Mode 6"

I'm going to guess the board doesn't support PIO mode 6 (compact flash).

https://en.wikipedia.org/wiki/Progr...

message edited by riider



#1
May 9, 2018 at 06:29:47
Here are some ways.

How to: Installing MS-DOS 6.22 when traditional methods fail
https://community.spiceworks.com/ho...

Beginner’s guide to choosing a hard drive for vintage PC’s and installing and optimizing MS-DOS 6.22
https://ancientelectronics.wordpres...


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#2
May 9, 2018 at 06:38:43
is there an option in the bios allowing PIO mode/ UDMA support?

anyways here is an interesting article:

https://forums.anandtech.com/thread...

i5-6600K[delid]@4.8GHz/4.4GHz@1.39v LLC=6 | 2x4GB Crucial-DDR4-2133CL15@14-13-13-28 1T 2800MHz@1.37v
MSI Armor RX 570 4GB@1430Mhz core@1.256v/1900MHz BiosModded


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#3
May 9, 2018 at 07:25:41
Are you sure the SSD is 256 MB and NOT 256GB? DOS can't deal with a drive that large.

message edited by OtheHill


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#4
May 9, 2018 at 07:32:10
I am sure its 256MB:

https://www.transcend-info.com/Embe...

indicating capacities of : 128 MB/256 MB/512 MB/1 GB/2 GB or 4 GB

it also states it should support:
up to Ultra DMA Mode 4
PIO Mode 6

i5-6600K[delid]@4.8GHz/4.4GHz@1.39v LLC=6 | 2x4GB Crucial-DDR4-2133CL15@14-13-13-28 1T 2800MHz@1.37v
MSI Armor RX 570 4GB@1430Mhz core@1.256v/1900MHz BiosModded

message edited by hidde663


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#5
May 9, 2018 at 08:00:37
Thank you for your reply. I use ghost to restore the image on SSD, and SSD works on another PC (Epson Endeavor 486DX-33). The BIOS of INTEL pSBC 486DX33 did not have any option to choose PIO or DMA Mode, and the maximum HDD capacity in BIOS is 512MB. However, I have tried several second-hand HDD, the capacity less than 2GB HDD can be found on INTEL pSBC 486DX33. Any suggestions are welcome. Thanks.

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#6
May 9, 2018 at 08:22:10
have you tried different PATA - 40pin connectors and/or cables?

As in the first link i gave the OP resolved the issue by trying different plugs(not sure if thats the word) because his mobo did not support the SSD in some of his PATA interfaces/plugs

PS. what you have 4MB of DRAM? times have changed

i5-6600K[delid]@4.8GHz/4.4GHz@1.39v LLC=6 | 2x4GB Crucial-DDR4-2133CL15@14-13-13-28 1T 2800MHz@1.37v
MSI Armor RX 570 4GB@1430Mhz core@1.256v/1900MHz BiosModded

message edited by hidde663


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#7
May 9, 2018 at 08:34:13
Thank you. I have tried 40 and 80 pin IDE cables, but it did not work.

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#8
May 9, 2018 at 09:08:38
✔ Best Answer
According to the SSD datasheet: https://www.transcend-info.com/File...

"Supports up to Ultra DMA Mode 4
Supports PIO Mode 6"

I'm going to guess the board doesn't support PIO mode 6 (compact flash).

https://en.wikipedia.org/wiki/Progr...

message edited by riider


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#9
May 10, 2018 at 07:51:58
Thanks for your help. I contact Transcend today, and the engineer promises me to modify the firmware to force the SSD always in PIO mode 0. I already send my SSD to Transcend, but I not sure that will work. After taking the SSD back, I will report the result. Thank you.

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