deskthority

option8 wrote:The II and II+ use an ASCII keyboard instead of a matrix …

What do you mean by this, exactly?

that is to say, the keyboard includes the matrix decoder on-board, so what it sends to the logic board is ASCII keystrokes. later models (Apple IIe and on) had the decoder/keyboard ROM on the logic board, so the keyboard was just the matrix of switches, and it was decoded on the logic board.

i'm probably not explaining it that well...

][ and ][+: Matrix -> Encoder board outputting parallel strobed ASCII -> Motherboard
//e, //c: Matrix -> Motherboard

Sorry, I misread your earlier post.

I will post you a Lisa KB when I have the time. Please PM your address to me.
I will be ordering the kit soon, and would like to discuss some other things with you later.

option8 wrote:that is to say, the keyboard includes the matrix decoder on-board, so what it sends to the logic board is ASCII keystrokes.

In other words, it's whether the custom PCB needs to translate scancodes, or scan the matrix?

Although "scancodes" is a bit fancy, here - it's outputting raw ASCII characters. And the modifiers don't get exposed - Ctrl is simply XOR 0x40 on the character generated, and Shift is basically selecting a second layer in the controller IIRC.

What's your best guess as to the weight of Alps SKCM Amber? I've just got three, and they're quite heavy.

I figured 20–30% heavier than regular Alps switches, so that's 85 gf at least, and my hilariously awful experiment gives me something like 80–100 gf, which is where I was guessing.

I can't imagine wanting to type on that, but I don't know if I just have some very worn switches — one of them doesn't even actuate any more, though I could have broken it when I was cleaning it for photography (the actuator leaf doesn't quite close the contacts when the slider is depressed).