A new old bug in the printer ROM?

[Christoph Giesselink]

(01-17-2023 05:59 AM)ThomasF Wrote:  Maybe they still are squared, it was just when I compared the 82143 output with the 82240 emulator that I found the 82143 characters to be much more narrower, as if the pixels were higher. And if I printed the pixels 2 units high and one unit wide, the output was very similar to the original 82143 printout (but not perfect) and the plotting was better aligned.

I done some measurements with the aspect ratio and you're right. With pixels 2 units high and one unit wide, you're closer to the original printouts.

These are the moments to rethink decisions I made. But therefore the actual printer simulation is in beta test phase open for changes, so I changed the pixel height from beta4 to beta5.

(01-17-2023 05:59 AM)ThomasF Wrote:  But how does the IR module 82242 solves this? It must also "fool" the printer to print the up-arrow in a program listing (e.g. ENTER^ and R^) or does it switch to ECMA94 mode (but diamond is still not present)?

This may have historical reasons. At the time the first IR module 82242 was sold, HP also sold the HP82240A printer with the Roman8 character set only. This printer was made for the Pioneers and Clamshells calculators. The HP82240B was later introduced to support the ECMA94 character set of the HP48.

Attached my actual printout (HP82240B.exe v1.14b5 and V41.exe R9Ib6) with the "TST" program listing, the "TST" running output, the 3 function HP plot from the PPC example, my character set output and a lower case double width text output.

Thank goodness the V41 has a Turbo button (TAB key). Printing is so slow.