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First post, by pentiumspeed

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Micronics M55HI PLUS I need either board with Rev B or D bios firmware newer than 10, I found version 10 and flashed this over 09 and was able to detect Pentium MMX processor properly with 2.8V VRM module. I did check the voltages, 2.8V and 3.3V are all present.

If you have one with 11 or newer firmware bios, use pflash to back up the bios and send it to me please, let me know here and by PM. Only 2MB in size.

Thanks and cheers, pentiumspeed.

Great Northern aka Canada.

Reply 1 of 3, by moonlight

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I have a Rev B board. There is a newer firmware version 4.06 that claims to supports 8GB hard drives. I don't know other capabilities, though.
http://www.elhvb.com/mobokive/Archive/Microni … m/m55/files.htm
Note: These 4.06 files are for Rev A boards. Be careful.

Last edited by moonlight on 2019-12-15, 22:42. Edited 1 time in total.

Reply 2 of 3, by Horun

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I also have a 55HI plus Rev B and it came with bios 09b and supports a MMX 166 with a 2.8v VRM, never tried a 200 so maybe I need v10....

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

Reply 3 of 3, by Horun

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Thought I would add this from MicronPC website April 2001 via Wayback machine.
M55Hi Rev A Motherboards
M55HI_04.EXE 120KB (09-06-96): Rev 04 Flash BIOS for Micronics M55Hi motherboard.
Use only with Rev A motherboards.

55HI_03.EXE 122KB (06-25-96): Rev 03 BIOS flash for Micronics M55Hi motherboard.
Fixes IRQ allocations on the PCI BUS. Use only with Rev A. motherboards.

M55Hi Rev B Motherboards
55HI2M10B.EXE 138KB (07-01-97): Rev 10b BIOS flash for Micronics M55Hi motherboard,
Rev B only. This flash includes support for MMX. PER THE ABOVE INSTRUCTIONS PLEASE
CONFIRM THAT YOU HAVE A REV B MOTHERBOARD BEFORE USING THIS BIOS UPDATE.
NOTE: THIS BIOS FLASH WILL NOT WORK WITH OS/2.

55HI2M9B.EXE 117KB (12-06-96): Rev 09b BIOS flash for Micronics M55Hi motherboard,
Rev B only. This flash includes support for MMX. PER THE ABOVE INSTRUCTIONS PLEASE
CONFIRM THAT YOU HAVE A REV B MOTHERBOARD BEFORE USING THIS BIOS UPDATE.
NOTE: THIS BIOS FLASH WILL NOT WORK WITH OS/2.

M55HI2M9.EXE 117KB (11-05-96): Rev 09 BIOS flash for Micronics M55Hi motherboard.
Rev B only. THIS FLASH WILL SUPPORT OS/2 but gives no support for MMX.

M55Hi Rev D Motherboards with USB Ports
M55hi_13.EXE 183KB (12-02-97): Rev 13 BIOS flash for Micronics M55Hi motherboard,
Rev D with USB ports only. PER THE ABOVE INSTRUCTIONS PLEASE CONFIRM THAT YOU HAVE A
REV D MOTHERBOARD WITH USB PORTS BEFORE USING THIS BIOS UPDATE.

M55r6_12.EXE 295KB (07-01-97): Rev 12 BIOS flash for Micronics M55Hi motherboard,
Rev D with USB ports only. PER THE ABOVE INSTRUCTIONS PLEASE CONFIRM THAT YOU HAVE A
REV D MOTHERBOARD WITH USB PORTS BEFORE USING THIS BIOS UPDATE.

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