The Hyper E: accelerator will double¢your screen display speed, while taking¢up only 150 bytes or so of low memory.¢If you are using a DOS other than¢SpartaDOS, it will take up an addtional¢30 bytes, but that's still a pretty¢small amount.¢¢The Hyper E: accelerator was originally¢written by Doug Wokoun. I found some¢compatability problems with it, and¢have released modified versions.¢¢There are three versions of the Hyper¢E: screen accelerator in this archive.¢¢HYP.COM is the normal version.¢¢HYPS.COM includes a routine to set the¢screen color to a user defined value¢any time the E: device is opened. The¢color values are preset to $82 and $0C¢intensity, and the only way to change¢them right now is with a disk file¢editor. The change is almost at the¢end of the file, and will start with¢the bytes, $A9,$82,$8D,$C6,$02.¢¢Finally, for the hackers out there, I¢included version HYP.ROM that can be¢burned directly into the OS ROM. There¢are a few advantages to this. It won't¢take up any memory. It will accelerate¢any programs that use the $E400 vectors¢directly, and there are alot of those.¢RAM loaded versions will only speed up¢programs that use CIO though E:, or use¢the vector at $346. Also, the ROM¢version can be more secure since it¢doesn't have to worry about having its¢handlers overwritten in low memory.¢¢Installation of the ROM version will be¢described at the end of this file.¢¢Use of HYP.COM and HYPS.COM is as¢simple as loading the program. Hyper E¢is relocatable, and will position¢itself right above MEMLO. When it¢installs, it will check to see if the¢E: handler has already been patched, as¢is the case with SpartaDOS, and if so¢it will install into the patched¢handler. This allows Hyper E: to¢remain compatable with Sparta's I/O¢redirection abilities. If no patched¢handler is found, Hyper E: will create¢it's own, along with a DOSINI routine¢to reinstall it after a system reset.¢¢It is possible that Hyper E: may find a¢patched handler, but be unable to¢integrate itself into it. If this¢happens, Hyper E: will display the¢message, "Can't Install", and you will¢be unable to use the program. Please¢contact me if you see this message, let¢me know what is running in your system,¢and I will try to adapt Hyper E:.¢¢- ROM version install -¢¢The HYP.ROM file is 131 bytes long, and¢is designed to execute as the start of¢the OS's E: PUT routine. You will need¢to know the location of this routine in¢your particular ROM, as well as a free¢149 byte area. In my 130XE ROM, the E:¢PUT routine is at $F2B0, and there is¢an unused space at $CB65. This is¢where the supplied file is set to work,¢but it can easily be changed to other¢locations.¢¢The first step is to copy the ROM image¢to someplace in RAM, and then find 131¢bytes of space that you can use. You¢can try searching for a long string of¢0's. The HYP.ROM file has a load¢address of $4B65. If you have moved¢the ROM down to $4000, and have free¢space at $CB65/$4B65, you may simply¢load the binary file HYP.ROM.¢Otherwise, use whatever method you are¢comfortable with to place the contents¢of the HYP.ROM file into your empty¢space area. The code is relocatable,¢so you do not have to worry about¢moving it.¢¢Next, the existing PUT routine needs to¢be changed to jump to this new code.¢Right now, the first instruction of the¢PUT should be "STA $2FB". This needs¢to be changed to a JMP to the new code¢we just loaded. The first instruction¢of HYP.ROM is "STA $2FB", so that will¢take the place of the existing one that¢you are about to overwrite. The byte¢values you want to store, are $4C, then¢the low byte of HYP.ROM, and then the¢high byte. In my example, these bytes¢would be $4C, $65, $CB. (Make sure you¢use the upper ROM address like '$CB',¢and not the '$4B' temporary RAM¢address!)¢¢The final step is a JMP instrustion¢back to the OS ROM. The JMP is located¢in the HYP.ROM code, $66 bytes from the¢beginning. In our example, that would¢be location $4BCB. This JMP needs to¢point to the location *after* the¢original "STA $2FB" in the OS PUT¢routine -- the one you replaced with a¢JMP in the previous step. In other¢words, this location will be the¢original PUT address +3. In the¢HYP.ROM file supplied, this JMP is set¢to $F2B3. If this is the right place,¢leave it alone. Otherwise, change the¢address to point to the correct spot.¢¢You should be able to save the binary¢image of the ROM file now, and burn a¢27128 EPROM.¢¢If you hae any questions or comments,¢please feel free to contact me.¢¢John Harris¢45346 Graceway Dr.¢Ahwahnee, CA 93601¢USA¢internet: jharris@poboxes.com¢¢
