Build OLD scsi,s

By erpirao

Paragon (1046)

erpirao's picture

08-02-2020, 00:19

build old SCSI
remembering the old days and after a conference (link) on a Spanish friend channel, I am interested in building a mega-scsi and a scsi-novaxis.
Do you know if there are designs to be able to manufacture them?
I do not mind having to do 10 pcb, s of each if I get my novaxis and my mega-scsi of 1MB.
Thanks a lot

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By gdx

Prophet (3483)

gdx's picture

08-02-2020, 10:41

If you want build a scsi-novaxis maybe that you interest:

https://www.msx.org/forum/msx-talk/hardware/latest-firmwares...

And for making Megascsi:

http://www.big.or.jp/~saibara/msx/ese/index.html

By erpirao

Paragon (1046)

erpirao's picture

08-02-2020, 21:44

gdx wrote:

If you want build a scsi-novaxis maybe that you interest:

https://www.msx.org/forum/msx-talk/hardware/latest-firmwares...

And for making Megascsi:

http://www.big.or.jp/~saibara/msx/ese/index.html

many thanks,
PAC has provided me with the link to the mega-scsi scheme (now I have to look for the most difficult component: MB89352a).
We keep searching for the novaxis.
Adapters such as the scsi2sd or aztecmonster can be very interesting with this devices.

By gdx

Prophet (3483)

gdx's picture

09-02-2020, 09:31

MB89352 in DIP format can be found on ebay without difficulty:
https://www.ebay.com/itm/Fujitsu-MB89352AP-DIP-48/271538935478
https://www.ebay.com/itm/2pcs-FUJITSU-MB89352AP-MB89352-DIP-...

The other format seems still sold in Japan but it not easy to buy it and it's expensive.
https://www.zaikostore.com/zaikostore/stockDetail?stockDetai...

Mega-scsi is more powerful than the Novaxis but it is more expensive.

By popolon_

Resident (55)

popolon_'s picture

24-05-2020, 13:34

Where do you get that LZ93A13 chip, other than luckily picking up right and cheap old megarom game cartrigde?

By lintweaker

Master (244)

lintweaker's picture

25-05-2020, 17:51

I also have some updated Novaxis ROMs on my github:
https://github.com/lintweaker/msxstuff/tree/master/novaxis
and if you are really adventurous you can modify the interface to have a flash ROM :)

BTW I have never seen any schematics floating around. There is a programmable chip on the interface for IO decoding and resetting of the SCSI chip. I might have some bear board(s) could be used to re-produce?