Category Archives: Apple II

High Speed IMP v2.46

With my collection of CP/M systems growing, I decided to make my high speed version of IMP platform independent.  I’ve removed the hardware-specific code from the main program but kept the code changes to support baud rate tables up to 115k. … Continue reading

Posted in Apple II, Kaypro, Z-100, Blog | Comments Off on High Speed IMP v2.46

Z80Pack CP/M Emulator and NZ-COM

Z80Pack by Udo Munk is a great CP/M emulator.  It will emulate a number of hardware architectures including the Altair and IMSAI systems, but I primarily use it CP/M development environment.  I can quickly write or edit CP/M programs and on my … Continue reading

Posted in Apple II, Kaypro, Z-100 | Comments Off on Z80Pack CP/M Emulator and NZ-COM

High Speed IMP for the PCPI SIO Card

IMP is a great little terminal program written by Irvin Hoff and I thought it could use a speed upgrade along the same lines as QTerm. The result was IMP_SIO.ZIP. Imp is much simpler than QTerm. It’s one .ASM file … Continue reading

Posted in Apple II | Comments Off on High Speed IMP for the PCPI SIO Card

High Speed Serial Port for the Apple II PCPI Applicard

The PCPI Applicard is one of the best CP/M cards ever made for the Apple II. It contains a Z80 chip running at either 4 MHz or 6 MHz, has it’s own 64K of RAM, and supports and optional CTC … Continue reading

Posted in Apple II | Comments Off on High Speed Serial Port for the Apple II PCPI Applicard

Senior PROM Reverse Engineering for the Apple IIe

Background The Senior PROM was a remarkably simple and beautiful debugging/cracking product for the Apple II. Other similar products were the Wildcard and the Crackshot, however, these two products both took up a slot in the Apple II and were … Continue reading

Posted in Apple II | Comments Off on Senior PROM Reverse Engineering for the Apple IIe

Apple IIe ROM Hacking

Background Many years ago I read a great article in Computist Magazine about modifying the Apple ][+ ROM code to allow halting the computer at any point in time for debugging/cracking purposes, something I had always wanted to do as … Continue reading

Posted in Apple II | Comments Off on Apple IIe ROM Hacking