This is a port of ZEXALL, the Z80 instruction exerciser, to the Sega Master System. It was written by Frank Cringle to go with his YAZE emulator. It was ported to CP/M and Spectrum by J.G.Harston, and subsequently to the SMS by Brett K. Unfortunately, his port didn't work on a real system due to some mistakes in the SMS-specific parts and (for some reason) produces different CRCs than were stored in the Spectrum version, although the SMS does have a regular Z80 CPU.
So, I converted Brett K's source to compile with WLA DX (the best macro assembler) and fixed the errors. The console emulation code he wrote is excellent, by the way. I also masked out the undocumented flags from the f register since no SMS games seem to depend on them and if an emulator doesn't implement them it would otherwise fail almost every test. Then I ran it on a real SMS and noted the results.
I also changed the ordering of the tests so that the quickest are completed first. A few of the tests are a LOT longer than others. The shortest complete in a fraction of a second and the longest takes (I think) well over an hour. You have been warned.
Since ZEXALL is covered by the GNU, I am including the source and licence.
Maxim
=============================
June 12, 2003
Eric R. Quinn
Added conditional assembly direction enabling test output to go to SDSC Debug Console instead of SMS VDP. The motivation for doing this was to eliminate the need for having a functioning VDP in a SMS emulator before running ZEXALL. (Hopefully, the SDSC Debug Console is easier to implement than a VDP.)
The binary zexall.sms uses the SMS VDP.
The binary zexall_sdsc.sms uses the SDSC Debug Console.
=============================
2021/10/16
Version 0.17
This version supports various options for output: it will emit to the SMS VDP in mode 4 if detected, else it will try a TMS9918 VDP in mode 2 (text mode), so this should work on an SG-1000 or SC-3000. It will also emit simultaneously to the SDSC Debug Console and also write ASCII text to SRAM.
Press Up to force mode 4, and Down to force text mode.
zexall.sms includes the undocumented bits in the flags register, zexdoc.sms ignores them.
You can build your own version if you want some different combination of settings.
Fonts used are https://damieng.com/typography/zx-origins/envious for mode 2 and https://damieng.com/typography/zx-origins/zx-eurostile for mode 4.