>The same architecture?! Yes, the same architecture. You know what PaulHoule meant, and if you didn't you should have. It's a fact that * It is relatively ea

>The same architecture?! Yes, the same architecture. You know what PaulHoule meant, and if you didn't you should have. It's a fact that * It is relatively easy to port between computers with the same 8-bit CPU * It is harder, but still quite possible, to port between the Z80 and 6502 * Very, very little software was ported to the 99/4A, and until the end the lack of software was a major issue for a computer that sold almost 3 million units The 99/4 architecture by and large baffled developers. Partly because of the unique CPU, but also because of fundamental design differences. I know of no Z80 or 6502-based computer which abstracts things the way 99/4 does. There is no TI equivalent (I'm talking about deviations from the prescribed norm, not the functionality per se) to the Atari 8-bit and TRS-80's multitude of DOSs, the C64's fast loaders, the Atari 8-bit's Happy Drive, Star Raiders and Eastern Front on Atari, Pinball Construction Set and Prince of Persia on Apple II, GEOS on C64. Since you're British, I'll add 3D Monster Maze on ZX81, Elite on BBC Micro, The Lords of Midnight and Knight Lore on Spectrum. Even the Color Computer, benighted by the 6809 CPU almost as unfamiliar to Z80 and 6502 developers as TMS9900, birthed Dungeons of Daggorath.