Close

SymbOS has the full one Megabyte !

A project log for Isetta TTL computer

TTL Retro computer runs 6502 and Z80 code. Has video, sound and filesystem. Runs a Windows-like OS. No microprocessor or FPGA.

roelhroelh 01/27/2026 at 08:340 Comments

Since a few days, the SymbOS operating system can use the full megabyte of memory on Isetta. The adaption was done by Prodatron, the genius that designed and programmed SymbOS.

Here is a screenshot of the 1 MB system. At the lower right side you see the memory map, the numbers 0 - F are the sixteen 64K memory banks. The yellow banks from B - F are still available !

One megabyte is the maximum amount of memory that SymbOS can handle. This means that the Isetta version is now just as capable as the SymbOS versions for all other platforms.

If you take a close look, you will see that many of the menu items and texts are now in Dutch ! Symbos will soon have a new feature, the support for several languages other than English. It will then also work with PS/2 keyboards for those languages. The first supported languages are Dutch, German, Spanish, Turkish and Japanese (really). French, Italian and Greek will be the next ones.

Discussions