After down­load­ing my stack (no longer online), distrib­uted as a self-expanding archive, double-clicking the .sea app would create the folder seen above.

A screenshot of the Read Me file is below, as are a bunch of the “cards” of the stack.

Hypercard was an amazing pro­gram for its time. Among the mini­ature data­bases and other things I made was a stack focus­ing on drill­ing hexa­deci­mal con­ver­sions. It had a welcome screen, a Main Menu, and three inter­active sections: the hexa­deci­mal play­ground, test­ing binary to hex con­vers­ion, and test­ing hex to binary con­ver­sion.

The Main Menu held the buttons for each section with a “What is Hexa­deci­mal?” button going into more detail.

The default state was zero. The hex digit 0 and all four binary digits 0.

No matter where you click­ed you were reward­ed. Click­ing a binary digit toggled it to 1. Depend­ing on which of the four you click­ed, the result­ing hexa­deci­mal number was shown in the “Hex” box to the left.

You could tap any hex digit in the row and see the 4-binary digits in the boxes above.

The “Hide Decimal Value” button toggled the visi­bil­ity of the decimal values over the binary digits.

This card was for practic­ing and test­ing con­vert­ing from binary to hexadecimal.

Four random binary digits were shown and you had to click the correct hex digit. Feed­back was given in the Status area.

When you were ready to race the clock you could start any time. The duration of the test could be changed. Sta­tis­tics were cal­cu­lat­ed and displayed.

At some point I thought it was decent enough to offer from my web­site. Later I up­load­ed it to MIT’s mirror of the Info-Mac Archive.

The whole Info-Mac Archive was erased by a hacker, some­one wrote. So I up­load­ed it again.

I can’t recall exact­ly when I was con­tact­ed by Pacific HiTech who want­ed my per­mis­sion to include it on a CD-ROM. I agreed; as long as they sent me a free copy of the CD. They did; a scan of the insert is above.‍