DOGN related update
I've had the privilege of doing some more 'digging' into the dark recesses of Laserium's DOGN interface that Greg shared with me. I started this back in Feb. 2022 but soon got sidetracked about 3 months later, but returned to the hunt recently. One thing that caught my eye was a 234 byte Hex listing described in the DOGN documentation as the "World". This block of 8-bit Bytes was probably at some point stored on the 2nd of two 2K ROMs installed on the DOGN (actually, the DOGN card had up to four 2K ROM or EPROM chips installed with a SPDT switch that selected either of two ROM chips at a time.) Greg has more familiarization with these ROM sets than I do
I knew from the side-notes of the DOGN documentation of this Hex listing that it was the North American continent plus Alaska and a bit of Mexico down to the Yucatan peninsula.
Last night I finally typed in the 234 X,Y Hex values into my Apple IIe Windows emulator memory and saved this block of memory as an Apple binary file in the same manner as I did with my own laser image files. I loaded a BASIC program I wrote years ago to plot an image's XY points on the Apple II/IIe high resolution graphics screen, loaded the "World" binary image file and plotted it.
When the "World" point plotting first appeared on the screen, the continent was split in half with some of it on the far left side of the screen, the middle of the screen blank and the rest of the "World on the far right side of the screen...and upside down. I knew the likely reason for this anomaly and adjusted my program to deal with 2's complement values.
And that did the trick as shown here, an emulation of the Apple IIe monochrome screen:
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Everything depends on everything else