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piffy136.txt
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2023-02-26
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PiffyDOS - Programmers JiffyDOS by Harlekin/Fairlight
JiffyDOS from CMD has almost become a defacto standard for the Commodore
world. It's compatility, speed and features makes it the natrual choise
for users today. I found it very interesting how CMD managed to sqeeze everything
into that 8kb of ROM and started to disassemble the code. With the
Omicron reassembler I got about 100k of text that i started looking into. I ported
the text to my PC and started dokumenting the code. This was back in '94.
After a few months work I finally had understood and documented the entire
JiffyDOS-KERNAL. Since then, I have modifyed my own JiffyDOS with lots of new features. My goal
was to have a programmer-friendly KERNAL in my system... And here I am.
Today I'm running PiffyDOS 1.36 whith the following features!
Extended Basic...
* MOC and MOX are two new commands that allows you to transfer data to and from a 17xx REU.
* Input numbers in hex/bin/oct format using $,%,& as prefix.
* MON command to examine both internal and REU memory.
* additional errorhandling for the REU commands.
More Function Keys...
* using the CTRL and F-keys allows you to fastcopy the entire memory to and fram the REU.
* CTRL + F1 copy C64 internal to REU bank 2.
* CTRL + F3 copy REU bank 2 to C64 internal.
* CTRL + F5 copy C64 internal to REU bank 3.
* CTRL + F7 copy REU bank 3 to C64 internal.
Additional features...
* Display the loadadresses (both when using JiffyDOS drives and normal drives).
* CTRL + X. Copy REU bank1 to C64 internal and execute program at $9000. (Rescue routine for
FairLights Xmem Assembler, or any other program working the same way.)
* FAST memorycheck that NOT destroys adr $8000 ar $a000 if an external memory is found.
Next release...
* Skip autostart is C= key is pressed.
* Possibility to load over I/O and KERNAL areas (D000 to FFFF).
I made a PiffyDOS-patcher the other day, with patches your original JiffyDOS and saves the PiffyDOS
to disk for later being burned into a EPROM. The PiffyPatcher is available for download in the download-area!