Looking for 8080/Z80 BASIC

I thought hte original Spectrumn had only single-bit sound, a DAC was certainly an improvement on that. I wouldn't be suprised if later vertsions of the Spectrum had AY3-8910 (or simialr) ICs, like the Amstrad CPCs. There were 2 Radio Shack sound cartridges for the CoCo that I know of. One was claled 'Orchestra 90' and was a pair of 8 bit DACs (stereo sound. The ROM in siad cartridge allowed you to play music, you defined the ratios of the harmoncs for each instrument (rather like the drawbars on a Hammod), entered the notes, it calcualted the wave tables nnd played it. The oterh was the 'Speech/Sound Pac'. This contains an SPO-256 speech syntheiser chip, a microcntorlelr to do text-to-speech and an AY-3-8910 (probbalby an 8913, actually, since it wouldn't need the I/O ports) for sound/ .That was quite nice, but very little software used it. As for the graphivcs, the machine was essentialy the Motorola application circuit for hte 6883 SAM and 6847 VDG, and thus you were limited to what those ICs could do. The COCO 3 replaced them with the GIME chip which did a lot more. Actually, I mis-rememebred. I've just dug out my BASIC-09 manual for the CoCo 2 version and it appears you got a library called 'GFX' with it. This incldued funcitos toset the graphics mode (and go back to text mode), set/reset points, test pixels, draw lines and circles and (oddly) to rwad the joysticks. You coudl do thins like RUN GFX("line",0,0,24,65) to draw a line fron (0,0) to (24,65) Yes, 've heard about it. Personally I think the Beeb was a ratehr better educational machine because it encouraged you to try hardware too. I am not convinced that python is the best choice of lanuage either. Actually I beelive there was a podule to add soemthing like that. There certainly was an internal expansion board for the A3000 to add a user port (I have it in mine). Of course there wsas an I2C bus on a cuuple of pins of the system bus (it was used for the intenral real time clock chip, but Acorn deecided to make it avaialble to hackers too). Adding a user prot to that is a matter of a PCF8574 chip. Sorry. This is a pet hate of mine. I am an amateur when it comes to electronics, computing, etc. I do it because I like it, I am entirely self-taught. And even if I say so myself, I donm;t think this makes me totally clueless. But there are those who claim that because I don't have the right bit of paper I cna't possibly know how to do <foo>. I amsolutely agree with you there. I don't think I've found any game for the last 35 years or so to be enjoyable. OK, I'm strange, but I got a lot more enjoyment out of the HP67 games pac (a set of magnetic cards to run on an HP67 clacualtor, a amchine with no sound and jsut a 7 segment numberic dispaly) than I did when a friend convinced me to try Doom (or soemthing) on his PC. That's why I stick to the older machines I can understand. They do all I want, I see no reaso nto replace them with somethign that can execute instructions many thousands of times faster, but it won't execute the isntructiosn I want. -tony