BIOS ROM image for GSI 1535 floppy controller.

[Chuck(G)]

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.

 

[modem7]

Thanks Chuck.
I have also added it to the collection at [here].

 

[jrmymllr]

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)]

I'll have a look--it's been years since I've used it, so be patient. I move pretty slowly these days. I may even have a manual....

 

[jrmymllr]

I'll have a look--it's been years since I've used it, so be patient. I move pretty slowly these days.

No rush, and thank you!

 

[Chuck(G)]

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:

https://minuszerodegrees.net/rom/bin/GSI/GSI1535.bin

 

[jrmymllr]

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:

https://minuszerodegrees.net/rom/bin/GSI/GSI1535.bin

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.