Jump to content

wierd_w

Members
  • Content Count

    1,733
  • Joined

  • Last visited

Community Reputation

1,337 Excellent

1 Follower

About wierd_w

  • Rank
    Stargunner

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/4000_Series_4016-4032_Technical_Reference.pdf looks similar to me...
  2. This site has a more concise distillation of the above. http://www.6502.org/users/andre/petindex/pinouts.html#memj4 So, it looks like that header really is just straight up for memory cards. That's all Commodore intended to go there. That doesn't mean you could not put a very carefully made expansion card on it-- it just means that the card would have to be memory mapped IO, and would be some custom arrangement that you define yourself, and then program for. (Say for instance, using a mapper chip to segregate some small chunk of the very bottom of the RAM space, with a small ROM chip that contains the necessary service routines, and functions as a safe area of memory to use for "write on ROM" style bank switching (You use a combination of having the WE pin raised high, along with you chosen address pins, to temporarily disable the bus lines for the ROM chip, capture the written byte from the CPU on the write attempt and then hand that byte to the mapper chip, before re-enabling the data lines for the ROM chip before the next memory fetch cycle. Using a small chunk of such addresses, various 1 byte messages can be sent to your mapper chip, to control which bank and which "device" to enable in the mapped window), combined with a small tag of memory after that, which contains status register information and any additional signals needed for or about the memory mapped IO devices, which is currently mapped in via the mapper chip, etc. ) It would take multiple instruction cycles to work with such a solution (Have to write to the ROM address to select which "card" you want to talk to, burning one cycle-- then write to the status control register area to set any IO flags for that card, burning a second cycle, then finally write a single byte word to the card's memory mapped IO to tell it to do something, for the third. Best case scenario is that you avoid switching card contexts whenever possible, so that you can queue up several interactions with the currently selected card together, then switch contexts only as needed. Alternatively, you could do something like TI did with their serial GROM chips, and simply have the bus automatically increment the currently activated card after access, thus getting one of the cycles back.), but it would work.
  3. I dont know if you would find it here or not... but it's worth a shot. http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001/index.html http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001N/index.html The header strips in question are labeled J4 and J9. The "Ram Expansion" schematics give a significant number of the pin numbers for these headers, and cite their signal line nomenclature. are you considering the construction of a DIY SRAM expansion for a PET?
  4. The issue with the PPC, was that it ran a crippled OS, with very little enthusiasm to develop for. The hardware itself was just fine.
  5. the TPDD also works with a wide variety of electronic sewing and knitting machines.
  6. All of you are clearly wrong. The clear and obvious choice is the cosmic space butt from the deluxe buttplug simulator.
  7. In the US, there was a different "culture" in regard to games. Consumers were more interested in cartridge based, dedicated game consoles, like the Atari VCS, or the NES. Games came on cartridges, were durable goods, and did not have a lot of muss or fuss with setup and use. (compared to a computer.) Computers on the other hand, where for "adults" for "adulting". (you know, visicalc and pals.) Computers that did not do "adulting" were not well regarded in the market, no matter what they were actually capable of. This aura of "adultness" and "For Business!!" dominated, which is one of the reasons the IBM (despite being inferior in oh so many ways at inception into the market) really dominated in the US. This is vastly different from Europe, in which the primary game experience was on home micros, like the C64, the Sinclair, ZX Spectrum, MSX and pals. Kids in europe were used to sharing cassettes with each other (as floppy disk drives were expensive, and these were inexpensive home micros), and many got so involved that they started making their own games (with the built-in BASIC implementations), and sharing them on cassettes in like fashion. This was a vastly different cultural dynamic to the US, where kids were mostly passive consumers. (which parents seemingly encouraged, as they did not want to field questions about technology that they did not know, and thus favored the solid state game experiences for their children instead.) That is not to say that there was not overlap-- there most certainly was, and in both directions-- this is just the observation of the prevailing trends. This is why Commodore USA marketed the Amiga as a graphics workstation for ADULT THINGS, LIKE CGI FOR MOVIES-- (and not as an epic graphics and sound platform for consumer games, like in Europe), and subsequently why the market was much more barren for it over here. The same would have happened for the Acorn Archemedes and its descendants.
  8. Before I got a DVD burner, I dabbled with encoding movie CDs. I actually got pretty good at doing the MPEG-2 encode process to crush things without ruining video (too much). I remember seeing actual VCDs of things like RoboCop in movie rental places. As for the "Diskette vs Cassette" question-- I always dealt with diskettes as a kid. I wondered about cassettes, and was always told "No, that is garbage tier stuff." by everyone older than myself, and was always curious about the experience-- but for me, it was always diskettes.
  9. Hmm.. Personally I would have used an external 5.25" generic SCSI CDROM enclosure. The size of the old SCSI-1 external port is VERY close to the size of an old-school external floppy diskette port cable connector. I would have made a suitable adapter on some protoboard (with an IDC header on the inside, a DB37 female port facing out) aligned with the SCSI-1 slot. It would require almost no cutting, and only some modest soldering.
  10. I always did it on an IBM PC in Hercules mode... The IBM model M keyboard was very responsive. *shrug*
  11. Is that an exceptionally rare hexbus video device for the TI Portable computers tucked in there? A full disassembly of its rom would be glorious, if it is.
  12. As for the "10 to 25yr olds not having time or mindshare for such a title" angle... 7th guest would lend itself obscenely well to a VR immersion remake. Many of the puzzles would be easily adapted, such as the piano puzzle in the music room. Being able to just freely roam around Stauf's house (with the exception for rooms that you cannot enter yet-- and then, having some force-feedback haptics for being denied could be entertaining), including the experience of being whisked through the secret passages (including the drain pipe!) could be quite entertaining on that platform. The puzzles were only part of the fun of that game-- there were little clickables everywhere, and those could be incorporated and expanded for a fully roamable version of Faust's house. But yeah-- the difficulty level of the microscope puzzle would probably need to be nerfed.
  13. One of the reasons I went through the trouble of compiling MUNT for my linux box, was to have MT32 compliant playback for this title. Sure, it takes FOR-EV-ER for the GM patches to load, but it is worth it. It really is. (Dont get me wrong, The Fatman did an amazing job even with OPL2/3 synthesis. Fucking wizard. But the MT32 experience is worth it.)
  14. Considering that a major feature of said game *WAS* the eyecandy you could load up on a CDrom... (The inclusion of FMV in a game was a radical new concept (The creators of 7th guest created their own codec for the FMV, because none existed yet-- and produced the Groovie format, which all the FMV is in, which is tailored specifically to the playback speed of a vintage CDrom for its bitrate requirements), the pre-rendered scenes were radically good for the era, etc....) It basically falls into the same kind of trap as Myst does today. I am basically saying that the game concept itself is still good-- however, its "shine" has dulled a bit, given what is currently possible. Now it is just a quirky puzzlegame from yesteryear. (and an obscure one to most people under 30, which is not necessarily a BAD thing. It means people can "discover" the game, and it will feel new.) Do I have it loaded up in my dosbox collection? Of course I do. It's a great little game, and it had great music. (especially if you have roland sound as an option.) I am just of the opinion that it would benefit the same way Myst seems to be, given the Steam Re-Release/Remake. Stauf's house could be much more cleanly modeled today-- more puzzles and general exploration features could be added, the atmospheric horror that was intended could be greatly enhanced with better lighting and interaction, etc-- and all that would greatly enhance the title, without taking away from its core.
  15. I dont know why, but I did a very silly thing tonight after work. --I think I did it mostly because I could. I have no application in mind for it whatsoever. Still-- I have these small glass bottles/vials, that I picked up for about 25 cents each, with screw on metal caps. I also have some medium gauge copper wire, rosin-core tin type solder, and entirely too much time without any supervision. I also have an LCR meter just laying around. So, I made the most ghetto electrolytic capacitor ever. Basically, I wrapped the body of the bottle, (as neat and flat as easily done without special tools), then flowed the solder to make a metallic jacket on the outside, then poked a hole in the top of the cap, fed more wire down through the hole, then soldered it in place. Filled it up with saturated table salt + tapwater after that. Turns out it is almost dead nuts on 140 picofarads for value. (140.3pF, with some wiggle, but not a whole lot.) (If I recall correctly, the magic with such a capacitor is the amount of surface area for the plates, and the thickness of the dielectric. The outside of the vial only has so much surface, so the resulting jacket is constrained on its surface area as well. A commercial can-type lytic cap has two sheets of metal, with a paper dielectric between them, wrapped up super tight inside the can, and saturated with a special organic based electrolyte. The sheets are super thin, so there is a lot of surface area. I was not really expecting an amazing value here, but 140pF is more than I anticipated for such a small vial. It is essentially a tiny leyden jar-- the historical ones used in early electricity research were significantly larger (and thus had more surface, and thus much higher capacitance values. Wikipedia says 1nF.) than this tiny thing, which is about as big as a fat, short finger. I think the thinness of the glass is a factor, as the glass is rather thin.) I would have to string a bunch of them together in parallel to make anything even remotely interesting, but still. Amusing that it was so close to a whole number for its value. Would be even neater if it was a clean 150pF, but it's not.
×
×
  • Create New...