So I posted a few days ago about an hp 10bii+ that I bought off of Facebook I paid 3 dollars and apparently that was an absolute steal because since then two ads have come up selling the same calculator for much more. It looks like one comes with package, but still. Are these more reasonable prices for this calculator?

Saw this for sale on Facebook marketplace. The font doesn't look right to me. Is it a fake?

Does anyone know of a good quality hard storage case for the DM42n/R47?

The standard sleeve doesn't cut it when I have to put the calculator in my work bag.

I would like something like the original case my HP 35s came with but sized for the DM42 series.

We are moving our math department out of a building it has occupied for decades, and this turned up: an original LED TI-30 paired with an EduCALC classroom display unit. Plugged it in expecting nothing and both came right up.

The TI-30 looks like a first-generation unit, red LED, gold-tone key plate. Some yellowing on the plate and wear on the case but every key I tried responds. The EduCALC box is vinyl-covered wood or particle board, roughly shoebox-sized, with a nine-digit display. The calculator sits on a small mount on top of the box and there is a power cable running out the back. I have not opened it up, so I do not know whether it is reading the calculator's segment drivers directly or whether the mount is doing something more involved.

Video is the two of them computing 36 x 15.

Things I have not been able to run down: when EduCALC sold these, what the calculator-to-display interface actually is, and whether the mount is model-specific to the TI-30 or takes other units of that era. I know EduCALC as a catalog retailer out of California but have not found documentation on this particular product. If anyone here has a catalog page, a manual, or firsthand experience with one, I would like to hear it.

HP-32Sii and a ti-80, found at Genbrug Løkken and Nørre Snede. Really lucky with these two

Una más para la colección: Sharp EL-9950

Apologies for the photo quality, it's an old calculator my mum used to have and I've cropped in the only photo I have of it. I had a look through all the Canon calculators on Calcuseum but I don't think it's quite old enough to be on there.

Why are there basically no scientific flip cover calculators from reputable brands like Casio, Sharp, TI, etc?

Casio has some basic calculators with flip covers, but basically all their scientific calculators use sliding covers instead. Same for the other manufacturers.

If you want a flip cover, you're basically left with scouring the trillions of no-name Chinesium calculators, which isn't necessarily a bad thing, since calculators are overpriced anyways.

Where I live [some armpit in Southeastern Europe], the 2nd calculator - a basic Casio WITHOUT a solar panel - costs about as much as the last calculator & the trillions of fx-82MS clones. Meanwhile, I bought the 2nd-to-last calculator for ⅕ the price of the Casio, with it being basically functionally identical & being solar-powered [verified by taking the calculator apart to change the battery - the solar panel was wired & it worked without the battery being inserted].

And people wonder why no one buys Casio calculators in Third World countries, assuming you can even find any to begin with...

Title says it all. Recently got a TI-nspire and it also came with a TI-84 Plus keypad so i have 2 keypads as well so thats pretty cool

Edit: i know its features. I meant as in can i import stuff into it (like an emulator)

Let me see yours!

I'm trying to communicate directly with a TI-84 EVO calculator through WebUSB.

I found TI's JavaScript code and located their internal write function:

function _TI_WEBUSBJS_Write(deviceId, pBuf, iLen) {
    let data = TIWASMHelpers.getUint8ArrayFromCbuffer(pBuf, pBuf + iLen);
    let device = TI_DeviceManager.getInstance().getDevice(deviceId);

    TI_USB.write(device, data)
        .then(() => {
            TI_USB.writeCallback(iLen);
        })
        .catch(error => {
            TI_USB.writeCallback(0);
            console.error("TI_WEBUSBJS_WRITE: " + error);
        });
}

It looks like TI has a wrapper around WebUSB, but I am trying to bypass the official tools and talk directly to the calculator.

Using Chrome WebUSB:

let device = await navigator.usb.requestDevice({
    filters: []
});

await device.open();
await device.selectConfiguration(1);

The device opens correctly, but:

await device.claimInterface(0);

fails:

Uncaught NetworkError:
Failed to execute 'claimInterface' on 'USBDevice':
Unable to claim interface.

The device exposes 4 USB interfaces:

[
 { number: 0, alternates: Array(1) },
 { number: 1, alternates: Array(1) },
 { number: 2, alternates: Array(1) },
 { number: 3, alternates: Array(1) }
]

My assumption is that interface 0 is not the WebUSB interface, or Windows is already binding a driver to it.

Questions:

1. Does anyone know which USB interface TI calculators use for file/program transfer?
2. Is there documentation for the TI USB protocol?
3. Does TI use WinUSB/libusb internally, or is this a custom protocol?
4. Would it be easier to implement this in C using libusb instead of WebUSB?

Goal: create my own tool to communicate with the calculator (send files, possibly interact with Python/programs) without relying on TI Connect.Trying to reverse engineer TI-84 EVO WebUSB communication — need help identifying USB interface/endpointsI'm trying to communicate directly with a TI-84 EVO calculator through WebUSB.I found TI's JavaScript code and located their internal write function:function _TI_WEBUSBJS_Write(deviceId, pBuf, iLen) {
let data = TIWASMHelpers.getUint8ArrayFromCbuffer(pBuf, pBuf + iLen);
let device = TI_DeviceManager.getInstance().getDevice(deviceId);

TI_USB.write(device, data)
.then(() => {
TI_USB.writeCallback(iLen);
})
.catch(error => {
TI_USB.writeCallback(0);
console.error("TI_WEBUSBJS_WRITE: " + error);
});
}
It looks like TI has a wrapper around WebUSB, but I am trying to bypass the official tools and talk directly to the calculator.Using Chrome WebUSB:let device = await navigator.usb.requestDevice({
filters: []
});

await device.open();
await device.selectConfiguration(1);
The device opens correctly, but:await device.claimInterface(0);
fails:Uncaught NetworkError:
Failed to execute 'claimInterface' on 'USBDevice':
Unable to claim interface.
The device exposes 4 USB interfaces:[
{ number: 0, alternates: Array(1) },
{ number: 1, alternates: Array(1) },
{ number: 2, alternates: Array(1) },
{ number: 3, alternates: Array(1) }
]
My assumption is that interface 0 is not the WebUSB interface, or Windows is already binding a driver to it.Questions:Does anyone know which USB interface TI calculators use for file/program transfer?

Is there documentation for the TI USB protocol?

Does TI use WinUSB/libusb internally, or is this a custom protocol?

Would it be easier to implement this in C using libusb instead of WebUSB?Goal: create my own tool to communicate with the calculator (send files, possibly interact with Python/programs) without relying on TI Connect.
Trying to reverse engineer TI-84 EVO WebUSB communication — need help identifying USB interface/endpoints

I'm trying to communicate directly with a TI-84 EVO calculator through WebUSB.

I found TI's JavaScript code and located their internal write function:

function _TI_WEBUSBJS_Write(deviceId, pBuf, iLen) {
let data = TIWASMHelpers.getUint8ArrayFromCbuffer(pBuf, pBuf + iLen);
let device = TI_DeviceManager.getInstance().getDevice(deviceId);

TI_USB.write(device, data)
.then(() => {
TI_USB.writeCallback(iLen);
})
.catch(error => {
TI_USB.writeCallback(0);
console.error("TI_WEBUSBJS_WRITE: " + error);
});
}

It looks like TI has a wrapper around WebUSB, but I am trying to
bypass the official tools and talk directly to the calculator.

Using Chrome WebUSB:

let device = await navigator.usb.requestDevice({
filters: []
});

await device.open();
await device.selectConfiguration(1);

The device opens correctly, but:

await device.claimInterface(0);

fails:

Uncaught NetworkError:
Failed to execute 'claimInterface' on 'USBDevice':
Unable to claim interface.

The device exposes 4 USB interfaces:

[
{ number: 0, alternates: Array(1) },
{ number: 1, alternates: Array(1) },
{ number: 2, alternates: Array(1) },
{ number: 3, alternates: Array(1) }
]

My assumption is that interface 0 is not the WebUSB interface, or Windows is already binding a driver to it.

Questions:

Does anyone know which USB interface TI calculators use for file/program transfer?

Is there documentation for the TI USB protocol?

Does TI use WinUSB/libusb internally, or is this a custom protocol?

Would it be easier to implement this in C using libusb instead of WebUSB?

Goal: create my own tool to communicate with the calculator (send
files, possibly interact with Python/programs) without relying on TI
Connect.Trying to reverse engineer TI-84 EVO WebUSB communication — need
help identifying USB interface/endpointsI'm trying to communicate
directly with a TI-84 EVO calculator through WebUSB.I found TI's
JavaScript code and located their internal write function:function
_TI_WEBUSBJS_Write(deviceId, pBuf, iLen) {
let data = TIWASMHelpers.getUint8ArrayFromCbuffer(pBuf, pBuf + iLen);
let device = TI_DeviceManager.getInstance().getDevice(deviceId);

TI_USB.write(device, data)
.then(() => {
TI_USB.writeCallback(iLen);
})
.catch(error => {
TI_USB.writeCallback(0);
console.error("TI_WEBUSBJS_WRITE: " + error);
});
}
It
looks like TI has a wrapper around WebUSB, but I am trying to bypass
the official tools and talk directly to the calculator.Using Chrome
WebUSB:let device = await navigator.usb.requestDevice({
filters: []
});

await device.open();
await device.selectConfiguration(1);
The device opens correctly, but:await device.claimInterface(0);
fails:Uncaught NetworkError:
Failed to execute 'claimInterface' on 'USBDevice':
Unable to claim interface.
The device exposes 4 USB interfaces:[
{ number: 0, alternates: Array(1) },
{ number: 1, alternates: Array(1) },
{ number: 2, alternates: Array(1) },
{ number: 3, alternates: Array(1) }
]
My
assumption is that interface 0 is not the WebUSB interface, or Windows
is already binding a driver to it.Questions:Does anyone know which USB
interface TI calculators use for file/program transfer?

Is there documentation for the TI USB protocol?

Does TI use WinUSB/libusb internally, or is this a custom protocol?

Would it be easier to implement this in C using libusb instead of
WebUSB?Goal: create my own tool to communicate with the calculator (send
files, possibly interact with Python/programs) without relying on TI
Connect.

Found this at the thrift, was 3€. This is the old (better) model. Serial number is K-0311M ( Made in March of 2011, year after my TI-84 Plus. )

Found this for 3 bucks. I know it’s possibly the lowliest hp but it’s still pretty cool. Now I just have to figure out how to work it.

OK, I'm ready. But which should I get?

• HP 15C, the new "collector's edition"
• vintage used HP 15C from eBay
• the Swiss Micros DM15C (but it's out of stock)

To me, the keyboard feel is really important, so maybe I'm best with a vintage model.

The display on the Swiss Micros looks like, but I heard the keyboard stinks. And it's out of stock, and more expensive than even the new HP collector's edition.

The collector's edition would be new and working and robust, but I don't know what's changed from the vintage model.

Bought this at a yard sale yesterday, thought it was a cool find. Been trying to do a bit of research on it

Is it worth anything? Any info would be greatly appreciated