7GMADISO@vu-vlsi.UUCP (02/13/88)
I think you're pretty much out of luck hoping to get specs on the Orchestra-90 from Tandy. The board was originally designed by a company called Software Affair, and just before they went out of business, they licensed the board and software to Tandy. Since they didn't design the board, I doubt Tandy even HAS technical specs on the thing, just the directions on how to make 'em. A person in my TRS-80 user's group here has managed to get far enough that he's gotten a low buzz bouncing back and forth between the two channels, but that's it. Your best bet is to disassemble the existing program, find out what ports it uses, and then figure out what FOR, which is what this other gentleman did. I agree that it's a little annoying to have the s/ware running in model III mode (I have an Orch-90 myself) but if you set the thing up on an autobooting disk, it isn't all that painful. ---- George Madison -------------------- ''Your logic is impeccable, Captain; we are in grave danger.'' -- Mr. Spock ('The Changeling') ''Outside of a dog, a book is a man's best friend. Inside a dog, it's too dark to read.'' -- Groucho Marx ''Shut off that light, Stella; I won't be looked at in this merciless glare!'' -- Donald (from 'Brothers') -------------------- BITNET: 7gmadiso@pomona UUCP: psuvax1!pomona.bitnet!7gmadiso
leonard@bucket.UUCP (Leonard Erickson) (02/24/88)
The original article either didn't get here or hasn't gotten here yet. So I'm posting this. For what it is worth, the CoCo version of the Orchestra-90 includes a schematic in the manual. Given Tandy's standard practices, it's probably the M3/M4 unit with as few changes as possible. Aside from resistors & capacitors it has the following: IC1 2764 rom for CoCo software? IC2 LS133 IC3 S138 or ALS138 IC4 LS374 IC5 LS374 IC6 4558 The circuit looks pretty simple... -- Leonard Erickson ...!tektronix!reed!percival!bucket!leonard CIS: [70465,203] "I used to be a hacker. Now I'm a 'microcomputer specialist'. You know... I'd rather be a hacker."