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BIOS ROM image for GSI 1535 floppy controller.

Chuck(G)

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Jan 11, 2007
Messages
41,156
Location
Pacific Northwest, USA
This one can perform as a secondary controller with up to 3 (or 4) drives, including 2.88M ones.

The board is simplicity itself--an Intel 82077SL FDC, a couple of PALs for address decoding, a 74LS245 buffer and a 28C64 EEPROM. The last is interesting because it's also used to store configuration information.

Someone might find this useful.
 

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  • gsi1535.zip
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jrmymllr

Member
Joined
Jun 18, 2012
Messages
47
Location
MN USA
Hi, do you still have this card? If so would you be so kind as to take a picture of the front and back? I have an idea, and can't find any information about this card anywhere.
 

Chuck(G)

25k Member
Joined
Jan 11, 2007
Messages
41,156
Location
Pacific Northwest, USA
Well, I located my GSI 1535 controller--the BIOS ROM is a surface-mounted PLCC 28C64 EEPROM. So I'll have to stick it into a system and grab the ROM contents with DEBUG. The weather is supposed to be terrible tomorrow; maybe I'll have time to do it then.

...aaand then I found that I've already done it. Look at the link from MZD:

 
Last edited:

jrmymllr

Member
Joined
Jun 18, 2012
Messages
47
Location
MN USA
Well, I located my GSI 1535 controller--the BIOS ROM is a surface-mounted PLCC 28C64 EEPROM. So I'll have to stick it into a system and grab the ROM contents with DEBUG. The weather is supposed to be terrible tomorrow; maybe I'll have time to do it then.

...aaand then I found that I've already done it. Look at the link from MZD:


I have the ROM image. I was asking for photos of the board, but that's no longer needed. Knowing what I now know, It probably wouldn't have helped me anyway. I instead got a motherboard that supports MR BIOS which directly supports 4 floppy drives (with a a basic controller board) and it's oh so nice.
 
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