ESC/P 2: EX-1000 printer, selectable paper#6770
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The four versions are: - EX-1000 and 7 other early printers (including FX-80, the only Epson available OOTB for Windows 1.03), have ESC i and ESC j. - 9-pin ESC/P, a superset of EX-1000 besides ESC i and ESC j. - 24-pin ESC/P in 360 DPI instead of 240. - ESC/P 2 with raster graphics. As for paper, four sizes: Letter, A4, Legal, B4. The former ones are mainly for EX-800, the latter two are sideways and meant for EX-1000. I did some other minor changes, like converting a bunch of defines to enum.
Also removed forward declarations.
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Summary
EX-1000 is a superset of FX-80, the only Epson printer available OOTB on Windows 1.03. These two, along with 6 other early printers, have two ESC commands that were removed in later models: ESC i and ESC j. Thus, it makes sense to make a printer version selectable.
There are 4 main versions, each slightly backwards-incompatible. The dropdown so far lists two entries: EX-1000 and ESC/P 2. There's some code for other 9-pin and 24-pin ESC/P printers but it's currently commented-out.
There are four paper sizes to choose from: Letter, A4, Legal and B4. The latter two are sideways as that's what the manual for EX-1000 suggests. To use it properly on Windows 95, dimensions need to be specified manually (width 3530 * 0.1 mm, height 250 * 0.1 mm) and, to print with the longer side being vertical, orientation needs to be set to horizontal.
While filtering the commands per printer type, I realized there are some for IBM Proprinter II. Since I didn't quite know what to do about these without implementing that printer, it's limited to ESC/P 2 printer.
Remaining things to do regarding EX-1000:
Checklist
References
https://files.support.epson.com/pdf/general/escp2ref.pdf
https://archive.org/details/ex800ex1000
https://files.support.epson.com/pdf/ex800_/ex800_u1.pdf