bios with scsi enabled

I measure the gnd pin on the plcc68 . Except pin 1 in the picture. The connection between plcc68 and plcc28 is the 50 to 7. That's all I've managed yet 😀

you can post pin numbers instead of taking 9mpix pictures 😀
If im reading it right ground is on pins 1 4 10 22 25 etc? that excludes 53C400, also not AIC-6250 http://www.bitsavers.org/pdf/adaptec/asic/AIC-6250_1988.pdf not NCR53CF94, not Future Domain TMC-850/TMC-950

A few of those Gnds match a 6260 but not enough, unless pin count got off in the 50's.....

I think I need a new pair of glasses. The counting in the picture above is wrong. Sorry
Correct is :

GND: 4,10,22,50,56, 64,68

Common
51 -> 7
58 -> 9

GND fits perfectly to the AIC-6260 P

try to find out all the connections later

This is getting exciting 😀 cant find bare chips, but according to one ebay seller selling $22 "Adaptec AHA-1520 S8 AIC 6260 Iomega SCSI Board" AHA-1520 is a potential source.
edit: sure enough https://download.adaptec.com/pdfs/installatio … /aha1520_ig.pdf 1520 1522 with plcc chip

Nice ! Grounds seem to match, can you check pins 16 and 48 to +5v ? just wondering about pin 4 : X1 input read as ground....I never tried ohming a crystal so not sure what to expect....
and board has a 20Mhz XTAL which matches the 6260 datasheet at bitsavers

pin 16 and 48 have +5V That looks very good . As soon as I have an AIC-6260 I will continue testing.
Is the AIC-6360 pin compatible? I can hardly find any information on the internet.

https://www.datasheets360.com/pdf/7118192563572001984

https://www.ebay.com/itm/153221095247?customid&toolid=10050

Horun wrote on 2024-02-11, 22:11:

just wondering about pin 4 : X1 input read as ground....I never tried ohming a crystal so not sure what to expect....
and board has a 20Mhz XTAL which matches the 6260 datasheet at bitsavers

Metal can is a clock gen, in that case one leg goes to ground. better yet clock gen goes to pin 6
http://www.bitsavers.org/pdf/adaptec/asic/AIC … 0_Data_Book.pdf
"The AIC-6360 is an upgraded version of the AIC-6260 and is pin- and software compatible with that chip"

Great ! So basically will be a AVA-1502E/1505E when the 6360 and term chips installed.

I have now ordered a 6360 via ebay US it will probably take a few weeks to arrive.
One question about the Terminator. Is 18-Line compatible with 14-Line ? There is UC5601 but also UCC5614 or UCC5618. The SCSI connector at the back is a 25pin SCSI interface

Good job guys

the AIC-6360L works! (no Terminator need). The AIC-6360 does not have DMA but for Installation from SCSI CD-ROM is ok.

Thanks

Love it, good thread with happy ending. Horun got it in 4th reply 😮