One had to do some significant hand tuning of config.sys and autoexec.bat to optimize conventional.memory usage for a lot of games in that era (ie. relocating device drivers to extended memory), at least until later versions of MS Dos included the memmaker utility to partially automate the process.
This was tricky enough that folks would pay my barely adult self a consultant's hourly rate to do this for them.
This was tricky enough that folks would pay my barely adult self a consultant's hourly rate to do this for them.