Search found 191 matches

by ijabbott
Fri Oct 30, 2020 8:21 pm
Forum: Discuss!
Topic: WP34S overlay and cable
Replies: 16
Views: 1138

Re: WP34S overlay and cable

gerryk wrote:
Mon Oct 26, 2020 7:47 pm
You don't need a special cable to flash. You can make an adapter from a piece of 2.54mm header and a couple of resistors. This will allow you to use a standard USB to serial adapter to flash.
The pads are on a 2mm pitch, so standard 2.54mm (0.1") header won't fit.
by ijabbott
Tue Oct 20, 2020 9:21 pm
Forum: Usage tips, tricks and problem reports
Topic: Can't get USB to work correctly
Replies: 6
Views: 599

Re: Can't get USB to work correctly

Some Micro-B cables seem to have longer plugs, i.e. they stick out from the plastic moulding more. Use those.
by ijabbott
Wed Oct 07, 2020 8:35 pm
Forum: Usage tips, tricks and problem reports
Topic: Contrast of screen
Replies: 4
Views: 698

Re: Contrast of screen

Not sure what a contrast adjustment would achieve on the DM42, since the 'on' pixels are already pretty black and the 'off' pixels are transparent. It looks great in decent lighting conditions.
by ijabbott
Sat Oct 03, 2020 9:11 pm
Forum: DM42
Topic: DM42 with homemade printer
Replies: 46
Views: 3532

Re: DM42 with homemade printer

I had some time today to write some more code. I now have the code running on a single Arduino Uno and it uses the correct font! That is, as far as I could decipher from a printout. There might be some pixels wrong here and there on some of the characters. So I have a request, can anyone who has a ...
by ijabbott
Thu Oct 01, 2020 10:46 pm
Forum: Usage tips, tricks and problem reports
Topic: Command Line text to raw converter
Replies: 8
Views: 763

Re: Command Line text to raw converter

Does anybody know if the free42 software can convert text to raw by loading a text program and then saving as raw. Yes, you can 'paste' a text representation of the program into Free42. Check it afterwards though because unrecognized text is silently ignored. I started looking at what would be invo...
by ijabbott
Sat Sep 26, 2020 12:29 pm
Forum: Testing
Topic: MathJax, anyone?
Replies: 3
Views: 363

Re: MathJax, anyone?

Nice work! Does it support both the "inline" and the "display" style?
by ijabbott
Sat Sep 26, 2020 12:27 pm
Forum: DM42
Topic: DM42 with homemade printer
Replies: 46
Views: 3532

Re: DM42 with homemade printer

Michael wrote:
Sat Sep 26, 2020 12:19 am
Very nice. Congrats!
I've been thinking of this too ...
May 2021? :)
by ijabbott
Sat Sep 19, 2020 10:04 am
Forum: Software Library
Topic: Machine accuracy
Replies: 4
Views: 652

Re: Machine accuracy

For HP50G 1+10E-12-1 = 10E-12 1+5E-12-1 = 0 If 10E-12 were the EPS for the HP 50g, then 10E-12 would be "the smallest machine value that can be added to 1.0 that gives a result distinguishable from 1.0" (the definition of EPS given in the linked PDF). But it's not the smallest. For exampl...
by ijabbott
Tue Sep 08, 2020 10:15 pm
Forum: Usage tips, tricks and problem reports
Topic: Question about updating the firmware on the DM42 calc.
Replies: 13
Views: 1343

Re: Question about updating the firmware on the DM42 calc.

I think whichever state file was last saved or loaded before an update gets reloaded automatically after an update. The STATE.f42 file that has been saved is automatically loaded after an update. State files saved with other names are NOT loaded. That doesn't seem to agree with the source code. Fro...
by ijabbott
Mon Sep 07, 2020 10:33 pm
Forum: Usage tips, tricks and problem reports
Topic: Question about updating the firmware on the DM42 calc.
Replies: 13
Views: 1343

Re: Question about updating the firmware on the DM42 calc.

I think whichever state file was last saved or loaded before an update gets reloaded automatically after an update.