Steven Seagal's Atari ST Web Site




  Development screen of Steem SSE 3.9.3.  

Hardware Overscan



No installation required in Steem!



  New ST models are available on the 'Machine' option page, STF LaceScan and STF AutoSwitch.  

  When one of those options is selected, Steem considers that one of those circuits has been installed on the STF. Those circuits intercept the DE (Display Enable) line on the motherboard to change video timings and persuade the system to draw video memory in the borders. It was easy to add to Steem because a lot of demos do the same thing.

Only possible on the STF and Mega ST because in the STE, the DE line between the GLUE and the Shifter couldn't be intercepted: they are one chip!

You need appropriate drivers (see here).

With those, you can enjoy hardware overscan in Steem!


  The big difference with software overscan, such as in all those "fullscreen" demos, is that hardware overscan doesn't cost CPU time. It's for the pros!  



  The freeboot option emulates a popular hack. With this you can store two single sided disks on one double sided disk. Many games were single sided because Atari released the first ST with single sided drives (as in the SF354 option just above this new one).

Technically, the hack targets the YM2149 because that's where side selection happened.

  As examples of disk images using the feature, check Xenon 2 (ST) and ST Basic/Guild of Thieves (STW).  

Alternative YM2149 emulation



  The YM sound emulation, when option 'C2' (Chipset 2) is checked, will now run at 2Mhz so that samples are taken at precisely the right time. An anti-aliasing filter has been added (thx Mike Perkins). This improves the sound with all sample rates (Star Trek especially).  
  With that filter, you don't really need to choose another in option Sound/Output type.  

YM File Recording


  Steem SSE can now save a YM file. This is usable by STSound and other utilities.  


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