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Cameo/Aphid selector

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rayarachelian:
Yeay!

rayarachelian:
As an aside, incase you want to make your own Phone Net connectors (RJ11) there's a schematic in glorious ASCII here: http://www.nic.funet.fi/index/mac/doc/phone-net-connectors.txt

This is a snippet of that:

--- Code: ---
 
A "O" means a connection
 
PIN NUMBERS ARE FOR MAC DB-9.
NUMBERS IN () ARE FOR MINI DIN 8 (MAC PLUS)
 
          CapNet Connector  (last update 8/21/90)
 
 J1                                                  J2
       9 (5)                               C1 .1 uF
RCV(-) ----------------------------O----------][------O
                                   !
       8 (                       !       C2 .1 uF
RCV(+) --------------------------------O------][------O
                                   !   !            ^
                                   !   !           TO
       5 (3)                10 ohm !   !         "PHONE"
TX(-)  -----------O-----------R3----   !          LINES
                  !                    !
       4 (6)      !         10 ohm     !
TX(+)  -----------------O-----R4--------
                  !     !
             1K   R     R  1K
                  1     2
                  !     !
       3 (4)      !     !
GND    -----------O------
 
 
PARTS LIST:
 
QTY    DES      ITEM
2    R1,2      1K 1/8W RESISTORS
2    R3,4      10 OHM 1/8W RESISTORS
2    C1,2      .1 uF THREE LAYER CERAMIC CAPS
1    J1        DB-9 MALE OR MINI DIN 8 CONNECTOR
1    J2        2 PIN BERG OR RJ-11 PHONE CONNECTOR
5    WIRE      (NOT SHOWN) 22 GAUGE STRANDED WIRE 6"
 
 
NOTES:
 
C1,2 can be disk type but ceramic is more stable.
The entire unit can be mounted on a 1" X 1" .100 ctr
bread board or smaller. No printed circuit is needed.
Connect all componets lead to lead and connect cable
wires to leads on bottom of board.
Use heat shrink tubing over entire board as a cover
or dip in RTV sealer or put in a old 35MM film case.
 

--- End code ---

In the case of the Lisa, since the Mac is RS422, you'd tie TX- and RX- together to data ground on the 25 pin side.

There's a bigger discussion here: https://mac68k.info/forums/message.jspa?messageID=1141

stepleton:
This weekend's Cameo/Aphid improvements  :D

* The "Selector" program that lets you select and manage hard drive images is itself loaded from a hard drive image, and I found it was too easy to overwrite it with (for example) a fresh install of the Office System. You can copy a fresh Selector hard drive image onto the Cameo/Aphid SD card with a modern computer, of course, but that's a hassle. Well, now you can also type a 20-byte program into Service Mode (note influence of the BLU manual here) and that will restore a Selector drive image for you, too.
* You can now create drive image files in five different sizes in the Selector.
* The Selector now shows you how big drive images are.
* Some minor bugs are fixed.I hope these updates aren't annoying --- this project has been a lot of fun to work on and I'm excited to share progress. There are just a couple more features to add at this point before I think it's at 1.0. I haven't made a microSD card image with these changes yet, but I will before too long.

rayarachelian:

--- Quote from: stepleton on February 28, 2021, 10:35:31 am ---The "Selector" program that lets you select and manage hard drive images is itself loaded from a hard drive image, and I found it was too easy to overwrite it with (for example) a fresh install of the Office System.

--- End quote ---

You could also add a read-only flag to an image to prevent writes. So the on the first write attempt it could switch to a default sized blank image with a specific flag?

And also another flag could be the concept of a stationary image, where it starts off as a read only image, say a golden LOS 3.1 install, and the first time it's written to, it gets cloned to a new image, and then subsequent block writes go to that one (now without the stationary flag). That way you could roll back images, or run various experiments, etc.

Hmm, it sounds like when you boot off a floppy the default is to have the selector image up, which makes sense, but then when it starts to format, perhaps that behavior could be detected and it could switch to a new blank image of a default size instead and then that could be named generically until the user changes its name? Or perhaps its boot sector/loader blocks written to the first blocks could be hashed and the hash used to select a name for the image.

If the Beagleboard has an RTC, perhaps the new image could be named with the date as well.
Don't mind me, just thinking outloud, really neat stuff so far! Many thanks!

stepleton:
That's a bunch of interesting ideas --- the copy-on-write idea sounds practical! One thing I want to be the case though is that people who don't care about the Selector, particularly Apple II and Apple III users, but also Lisa users who just want a plug-and-play ProFile replacement, don't have to take any special steps to deal with it. (It's not like there are more Cameo/Aphids in the world than can be counted on two hands, but I like to pretend.)

Talking of other Apples, I would love to know if my device would work with an Apple that isn't a Lisa. I have high hopes, but there's no substitute for testing. Maybe post-pandemic I can find someone suitably-equipped nearby who would let me try it out. (There isn't much room for more computers here, unfortunately, and they're not exactly handing out Apple IIIs these days...)

Unfortunately there's no RTC on a PocketBeagle --- on those devices, unless you connect them to the internet somehow (or maybe just to another computer), it's always 2019 (or whenever the kernel was built).

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