#miscusi — Public Fediverse posts

Cleaned up the #MiSCUSI CMOS variant repo, regenerated sources, generated rev.2 gerbers (fixed some silkscreen issues) and added a link to the #PCBWay project if you prefer to order from there.

https://codeberg.org/hkzlab/MiSCUSI_AppleII_Plus

Released the CMOS-controller-variant of the #MiSCUSI #Apple2 SCSI card!
https://codeberg.org/hkzlab/MiSCUSI_AppleII_Plus

This variant is compatible with the relatively common 53C80 SCSI controllers (the previous variant required a hard to obtain NMOS PLCC controller).

Enjoy it. I have not yet set up a project with BOM on PCBWay, but did an 11h day today and I'm dead tired, so that will wait for tomorrow :)

If you want to contribute and have the means to, a small ko-fi donation is always appreciated!

I really need to get back to the #MiSCUSI CMOS version, cleanup the repo and release.

Need to clear up a few things with potentially interested parties to decide whether to release the whole project or just schematics + gerbers.

In any case, I hope it'll be out soon-ish.

Another update on the #MiSCUSI, as I finally got hold of 28C256-15 of unsuspicious provenance and can confirm they just work fine.

Looks like the AliExpress batch was of rebadged slower variants.

https://codeberg.org/hkzlab/MiSCUSI_AppleII

Yes!
I just tested a small batch of AT27C256R-70 OTP ROMs in the two #MiSCUSI variants (CMOS and NMOS #SCSI controller) and they work flawlessly on both.
So I now recommend using these.
https://codeberg.org/hkzlab/MiSCUSI_AppleII

Still waiting for other 28C256 to check.

#apple2

The new revision of the #MiSCUSI SCSI card for #apple2 works! (Almost fully SMD SCSI card with active termination)

This one uses CMOS 53C80 controllers (easier to get in PLCC format than the NMOS ones, tested several zilog and an AMD one), replaces the 'LS133 with something cheaper to get and shuffles around some components.
I was even able to test the fuse protection 😬

It's currently running some games on my Delta Apple2e clone using #BlueSCSI .

Quite busy these days, but every time I can spare a few minutes I'm proceeding with the #MiSCUSI prototype for 53C80

Soon(ish).
#apple2 #MiSCUSI

Oh good, the new #MiSCUSI variant proto is scheduled for delivery next Monday. Hope it likes the 53C80 and replacing the 'LS133 doesn't scramble the timing too much!🤞

Order placed for the new #MiSCUSI variant. 🤞

Spending some time to finalize the 53C80 version of the #MiSCUSI today.

Cleaning up some routing, tweaking fill zones, moving around parts of the silkscreen.

The objective is placing a PCB order tomorrow for this and other few things I want to proceed with the KIM-1 build.

Hell of a day, and it's not finished yet.
But almost there with the last #MiSCUSI variant.
Will probably order the proto in the weekend.

Great, the routing for the 53C80 / '133-free #MiSCUSI (#Apple2 #SCSI yada yada) has been completed.

There are some things I want to tweak now, then the fill zones to prepare and tidy up, but I expect the prototype to be ready for a production test within the week.

But this is enough retroing for today: loads of other work to do before the end of the day.

Very good progress on the 53C80 + substituted 74LS133 #MiSCUSI board for the #Apple2.

Routing of signals is complete, only power is left.

Finally, the #MiSCUSI is released!
https://codeberg.org/hkzlab/MiSCUSI_AppleII

For the newcomers, it's a rebuild of the Apple II #SCSI card, made with SMD components.

Tested it on my #Delta Apple //e clone with a #BlueSCSI

Thanks to #PCBWay for sponsoring this,and thanks to @DosFox for testing the PLD dumps on his card!

As usual, if you like my projects and have some credits to spare, you can throw me a few via Ko-Fi. It's not strictly necessary, but all go towards the next projects (instead of using what's left after I have fed and medicated the cat colony I inherited...).