He shoots! He Boots! Heath Lives!

Whilst in a self-induced trance, Stacy C. Morang happened to blather: Uh... Update, folks! (and I gotta name this thing now... how about "Heather"... 8-) Get it?!? It boots! Did I mention that it came with one floppy disk stuck in the bottom drive? This floppy was a boot floppy! And it still works! Joy! ;-) You're right, but they seem to format to only 320K (8 sectors/track, not 9) with the DOS I do have, which is listed in the stats of the machine I listed below... The broken drive *does* work! It's only the door that's broken, so I sacrificed my Atari 810 (which was dead anyway) and the garage door from it is exact! Yiippee! Whaddya did with the rest? A few spare parts might be nice (or a color tube, if yours had it... ;-) I don't doubt your memory, but I think this is a (prolly earlier) version of the monitor rom... specs to follow. I fat-fingered *all* the keys on it, and here's what works: B -- boots. Accepts parameters of: 0, 1, 2, 3, and that tells it what floppy to boot from. Plain B assumes floppy 0, which is top. Thanks! All else beeps with invalid parameter, except "S", which appears to do nothing. Would this be boot from the serial port, perchance? V -- Version of the monitor rom, which is Version 1.02. Nothing else worked... This thing came with a Version 1 Dos... here's the specs of the boot: Z-DOS / MS-DOS BIOS Release 1.00 Version 1.02 Z-DOS / MS-DOS Release 1.00 Version 1.25 (C)Copyright 1982, Zenith Data Systems Z-DOS / MS-DOS Command Release 1.00 Version 1.19 I've pulled 'er apart to fix the floppy, and to clean the keyboard & all. Sure enough, it has a NEC 8085A plastic, and an Intel 8088 like-eprom-whatever-you-call-it case. It presently has 128K RAM in it! Questions: 1. Whilst it's all apart, does anyone want me to snap pictures? I can... 2. How high can this rascal go in memory? I located 3 banks (9 each -- parity) of 64kx1 300ns DRAM, two of which are populated. Mathmatically, that works to: 128K RAM. The third bank is empty. Can I pop in 9 more chips without setting any jumpers/dipswitches? How about bigger DRAMS? (prolly not... but it's worth an ask!) Still, 192K is still pretty good for a machine from '82! (also, on the question of jumpers... anyone have a tech-like manual for this thing I could get a copy of... or at least a copy of the important pages?) 3. The video board which is based on the Motorola 68A45P video chip, presently has 64K onboard for *just* the green section of the board. This rascal can handle 192K Video Memory!!! Funky! ;^> (that is, if I'm reading the boards right.... but CHKDSK doesn't return the added video memory, so that'd seem correct.) Does the board support any form of graphics? I tried the standard basic commands (ZBasic was on the floppy) but it seemed only to work in text. For this thing having 2 Intel-based processors, I'm surprised with the amount of Motorola logic in this rascal! Prolly a 3rd of it is Moto, including the 74 series chips! All of the important support chips, like the video processor, the PIA's & UARTS, and all that jazz seem to be Moto. Well folks, I havta say: This is one *sweet* machine! :-) Did Heath/Zenith bundle an OS with the disk systems? If so, wouldn't I own a license to own a copy of the included OS, as I own the machine? I'm not sure how stuff like that works, especially on the old stuff. No prob... I'm behind as well, as you can plainly see! Ohhh, brrrr! I hope yer' talkin' Hockey!!! ;^> Thanks again, and have a good weekend! Roger "Merch" Merchberger -- Roger Merchberger | If at first you don't succeed, Programmer, NorthernWay | nuclear warhead disarmament should *not* zmerch(a)northernway.net | be your first career choice.