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About Gorgonops

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  1. Letter size is fine. Legal size is a problem.
  2. BasiliskII's SCSI passthrough worked well for me the last time I tried it on Linux, but that was 20 years ago so I'm hesitant to promise anything. You *might* actually be a better off with Sheepshaver, the PowerPC emulator; I *think* it also supports SCSI passthrough, and from the last time I looked at both it seemed like SheepShaver might be being slightly better maintained at this point. With BasiliskII I actually got it to drive a Microtek scanner, so I know it doesn't just work on disks.
  3. Gorgonops

    Video Output Frequency of Macintosh LC - 25hz??

    “25hz” on a conventional phosphor CRT would blink like a strobe light, it wouldn’t be remotely usable. Ask anyone who had an old Commodore Amiga how much fun the interlaced 400 line mode was; the lines flickering were visible to most humans at 30hz and could give you a roaring headache, but this would be worse not just because of the even slower update speed but because a progressive scan that slow would mean that there would be a perceptible “rolling” effect across the entire screen. (An interlaced scan at least keeps the total brightness across the screen more consistent because it’s getting scanned top to bottom twice as often than the full line update rate.) And yeah, like I said, I’d be *really* surprised if people keep tripping over 512x384-wired adapters in the wild. People should check their PRAM batteries first, and then, if they don’t have an adapter with switches, investigate if it’s set for a resolution *higher* than an LC can handle, or try a different monitor and rule out their LCD being super picky about non-VESA refresh rates.
  4. Gorgonops

    Video Output Frequency of Macintosh LC - 25hz??

    Yes, anyone who says "25hz" is on crack. They're probably confusing it with the (roughly) 25khz horizontal scan rate of the 512x384 mode. I'm actually somewhat skeptical that this is usually a root cause of their issue because they're obviously going to be trying to use a generic monitor with a DB15-to-HD15 adapter, and I wouldn't *think* there'd be many in circulation that have the sense lines set up for that mode because there were never very many monitors that supported it. (Pretty much be restricted to early generation "Multisyncs"; monitors that will happily sync with sub-31.5khz sources mostly died out by the early-1990s, and they were generally "premium" models.) Most of the monitor adapters I've seen that don't have mode selection switches are either "multisync" or locked at 640x480. That said... So, regarding "setting up the adapter right", if you have one of the switchless ones you kind of need to figure out *what* it is. The "multisync" ones were targeted for later Macs (last-gen Quadras? and Power Macs) that have "Extended Sense Line" support, and I'm not positive LCs grok those properly; I'm not sure *what* video mode they'll default to with one attached. Re: the 640x480 ones, I think those come in both "real VGA" (640x480x60hz) and "Mac" (66.7hz) flavors; it was the LC that introduced the sense line combination for 60hz. Most CRT monitors will work fine with either unless you have a positively ancient fixed-frequency VGA monitor, like one that came with an IBM PS/2. Older LCD monitors will also generally work, but you *may* run into trouble with newer LCD monitors if the Mac is spitting out the 66.7hz refresh rate; in the mid-2000's they started getting lazier with the scaler boards and expecting the attached computer to honor DDC, rendering the monitors incapable of syncing with anything but a limited set of VESA modes. For these you'll pretty much have to have an adapter that *specifically* gives you the "real VGA" mode. Here's another thing I'll just toss out there: LCs, in my experience, are one of the Macs that might give you a black screen (not initialize video at all) if their PRAM battery is dead.
  5. @olePigeon I know it's probably pointless to volunteer this until you can sort out the mechanical issues, but if you actually get it running do you want to upgrade it to an Applewriter Plus? Last time I went to a library book dump I found, mysteriously mixed in with the computer books, a NIB "Laserwriter Plus Kit". If memory serves inside it should have a new set of ROMs, some font disks, and a replacement label sticker. I say "should have" because it's still in the unbroken shrink wrap, so I don't *actually* know if it has the whole shebang in it. All it gives you is more built in fonts, of course. Maybe you'd rather keep it original for the "collector's value", I suspect they're rarer but I actually have no idea.
  6. I have a real soft spot for the "baby" of the Canon line, the LX engine, myself. (As used in the HP IIp/IIIp, Apple's Personal Laserwriters, etc.) My first laser printer was an oddball little Postscript Clone printer that was sold under various OEM names that used that engine, and despite the engine being quoted as 4ppm instead of 8ppm like the SX printers that little printer would run rings around an HP LaserJet or Apple Laserwriter on the "first page out" benchmark because it had an AMD 29000 RISC CPU in it instead of a 68000... So, I dunno, maybe I actually liked that *printer* in spite of the engine instead of because of it, but it made for a nice little package, and enough people used the engine for refilled cartridges to be very cheap and available.
  7. Gorgonops

    Question: 128k/512k and 800k drive

    Then you should be good good to go. I probably should have mentioned that myself since I have first-hand experience that my 512k-no-e can boot from a IIgs drive connected externally.
  8. Gorgonops

    Question: 128k/512k and 800k drive

    Yes, that particular drive works because Apple did some "magic" the tach signal that sidesteps the bug in the 64k ROM. The internal 800k drive mechanisms (or the "original" Mac-styled 800k drive) are the ones with the problem.
  9. Gorgonops

    Question: 128k/512k and 800k drive

    The IWM isn't a problem, but the ROM is. To make a long story short trying to use an 800k drive with the original 64k Mac ROMs results in a divide-by-zero error because a bug in said ROMs gets triggered if there isn't a constant slight variance in the tachometer readings, which the 800k drive doesn't provide. (Remember, the 400k drive's speed was directly controlled by a PWM signal generated by the Mac and adjusted based on tach feedback, while the 800k drive self-regulates its speed based on what track the head's on.) You could slap a set of Plus ROMs into the boards for testing, if need be. That essentially would temporarily convert them to 128ke(an unofficial designation for such a Frankenstein)/512ke's that are fully compatible with the 800k drive.
  10. Gorgonops

    MAC SE/30 with orange colored CRT

    One thing to be careful of if you sub a green or amber CRT into a Mac is the longer persistence phosphors in them are somewhat more prone to burn-in than the white TV phosphor the Mac came with. Probably not a big deal considering how much use a toaster Mac is likely to get in the real world today, but definitely consider turning the brightness down if you walk off for a while. Unless the Mac had other specific "Tempest" modifications there really isn't a lot of reason to suspect the military was involved in the CRT swap, but it is at least *possible* that it was swapped because of some government requirement that machines purchased for some agency meet some ergonomic standard; the selling point for those colored CRTs is their longer persistence phosphors reduced flicker and, therefore, reduced eyestrain. Langley-St. Clair was mentioned earlier as a vendor that sold alternative CRTs for various computers, I'm vaguely curious if they ever advertised in a Macintosh magazine. The CRTs themselves weren't "special" and were used in many portable computers; the original Compaq portable used green, but as noted the IBM 5155 used amber, and amber was an option on the later Compaq Portable II and scads of others, including bargain basement knockoffs.
  11. I didn't see this answered earlier, I apologize if I'm blind. Asterisks like that usually mean "active low". (IE, the line is pulled to zero to activate the named function. This is usually the case for chip selects. Not universally so, but usually, because TTL process chips in particular tend to float to "1" if they're left disconnected so it's the slightly safer choice.) Another common convention is to put a /slash in front of the name.
  12. Gorgonops

    Apple Lisa Twiggy/FileWare Disk Recreation

    So, yeah, there you go, HD media is the correct choice. The Twiggy just sort of sucks at using it.
  13. Gorgonops

    Apple Lisa Twiggy/FileWare Disk Recreation

    HD disks are utterly hopeless in drives like the C1541 (and Disk II/TRS-80 Whatever/IBM 5150/etc), the magnetic coating on them is far too stubborn for the pipsqueaky powers of a double-density head. On the other hand, my recollection is that according to "those who know" the magnetic coercivity of the Twiggy was either identical to 1.2MB floppies or at least closer to it than double-density media, so of what's available it's the better choice. Honestly I kind of wonder about the recommendation because, frankly, the capacity of the Twiggy isn't that great. They sold "Quad Density" drives that formatted conventional DD disks with 80 tracks of 96 TPI track spacing instead of 40@48 TPI and the resulting capacity was similar to that of the Twiggy and it was achieved without playing games like varying the disk speed. (Commodore sold a disk drive called the 8250 for the PET series of machines that actually got *more* on a disk than Twiggy using conventional DD media formatted in a GCR format that similarly packed more sectors on the outer tracks, but did it by varying the data rate.) It might be an interesting experiment to mod some DD media and see if the HD media actually does work better.
  14. Gorgonops

    Macintosh Portable SRAM card: Schematics available?

    I had one of those Radio Shack Science Fair 150-in-1 things with the springs when I was a kid, that's probably my most relevant qualification.
  15. Gorgonops

    Macintosh Portable SRAM card: Schematics available?

    That's the important part. Isn't the GAL's fault that this board has that ridonkulous number of RAM chips. If you had fewer larger ones it'd do the job all by itself.