Back to Start Page

Design Goals

From 256 bytes to 512K RAM

Whilst a great cost pared design, the original MK14 did have some extremely annoying features. I would include the following in these:

So I decided to fix all these in my redesign. The V2.0 machine has the following features:

The overiding goal I had was 100% software and hardware interface compatibility with the original. That means programmes run at the same speed, the memory map has the same aliases and the RAM I/O works exactly the same as it always did. The extended memory modes let you do more (in a fully decoded 32K+32K), or you could map more RAM by removing some of the ROM repeats in the original 4K image by changing a couple of lines in the CPLD VHDL code.