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  1. Replies
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    ... FWIW, I was poking around to see if I could...

    ... FWIW, I was poking around to see if I could find one of those VGA-to-memory programs to experiment with, and Google mentioned this thread that has a post in it where you say the Lo-Tech card...
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    Separate mechanisms to do backfill and UMBs and...

    Separate mechanisms to do backfill and UMBs and another for an EMS pageframe is a lot easier than an EMS 4.0 board for the cited "what about a driver?" reason.

    (Well, that and the hardware is...
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    If someone wants to write the driver for it I...

    If someone wants to write the driver for it I have some ideas for the hardware. The only standards doc I could find for EMS 4.0 is eye-bleedingly opaque, and huge. (And packed with weasel words about...
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    GOLD IS BEST! ...

    GOLD IS BEST!


    https://www.youtube.com/watch?v=n7-RetY7fGo

    (Remember, after Gandalf the Gray fell to the center of Middle Earth during his battle with the Balrog he transformed into Gandalf...
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    Yeah, I wasn't thinking of having the GAL...

    Yeah, I wasn't thinking of having the GAL generate the load, just mute it if you're not in the blanking area, IE, psuedocode:

    /SRLOAD = /BLANK * /DCTC

    Where "blank" is whatever combination of...
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    I think you should paint it gold to go with the...

    I think you should paint it gold to go with the keyboard badge. Embrace its uniqueness. ;)
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    That's really weird; I wonder what in the world...

    That's really weird; I wonder what in the world they're choking on. There's certainly nothing special about the lo-tech RAM card that should cause problems. If the memory wasn't testing OK I'd almost...
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    I built it into my ridiculous Tandy 1000 expander...

    I built it into my ridiculous Tandy 1000 expander mostly because I had logic to spare in the GALs and wanted to soak it up with something. Itís primarily good for shock value. (ďEMS in a 1000 EX?!...
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    Ah, interesting. Yeah, I haven't built...

    Ah, interesting.

    Yeah, I haven't built anything yet for something that uses Motorola's schemes, and I have to say they kind of give me a headache. (Did help someone with the GAL programming to fix...
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    ... I was about to say I'm still a little...

    ... I was about to say I'm still a little confused, but I think I get it? I was about to say the datasheet I have for the '166 seems to indicate that when you hold "clear" the output at Qh is low, so...
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    The LTEMS board doesn't have any mapping...

    The LTEMS board doesn't have any mapping capability; the driver is "EMS 4.0" compliant but only because under the EMS 4.0 standard basically *any* EMS 3.2-compliant board can be, all the hardware...
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    Yeah. I'm just curious if it works on anyone...

    Yeah. I'm just curious if it works on anyone else's hardware. The card I built *should* be 100% "register compatible" with the Lo-Tech card and it works with the EMM driver for it, but technically...
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    I assume that's the Lo-Tech 2MB EMS card? If it...

    I assume that's the Lo-Tech 2MB EMS card? If it is and you want to test a random thing some joker on the internet came up with I wrote a little point-enabler dingus, "ems2umb.exe" to set up a card...
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    Just took a look at the Kaypro's video schematic,...

    Just took a look at the Kaypro's video schematic, and I have to admit I'm stuck scratching my head why they used a six bit edge-triggered latch plus an 8:1 multiplexer instead of a shift register for...
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    So, the short answer is I'm pretty sure that,...

    So, the short answer is I'm pretty sure that, yes, MEMW and IOW (and MEMR/IOR) should be mutually exclusive *unless* a DMA cycle is happening, in which case a cross-pair could be up? (MEMR + IOW, or...
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    I bought a used car in the early 1990's that came...

    I bought a used car in the early 1990's that came with a CB in it, and within a couple weeks of fiddling with it I made a point of never turning it on. (Eventually just pulled it out from under the...
  17. I would definitely recommend not pulling off...

    I would definitely recommend not pulling off random wires without knowing what they do. If youíre serious about making this work you need to start documenting the circuitry as it is *now* and...
  18. It's unlikely that A16 and A17 needed by that...

    It's unlikely that A16 and A17 needed by that missing multiplexer go *directly* to the CPU. In a typical XT the 8088 sits behind a number of buffers and latches to deal with the fact that Intel used...
  19. The "L" just means low power, they're both TTL...

    The "L" just means low power, they're both TTL chips and most flavors of TTL are electrically compatible. (An "S" is faster than an "LS", but not as fast as an "F".)



    Okay, so that *is*...
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    Sticky: Heh. I was thinking of suggesting the same thing....

    Heh. I was thinking of suggesting the same thing. Lots of contemporary computers implemented color graphics as bitplanes back then. (For the decent reason that it significantly reduces the speed at...
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    I'm really curious how they did that, I'll have...

    I'm really curious how they did that, I'll have to see if I can dig up the schematic.

    I've been working on my own video project, a from-scratch video card intended to emulate early S100 video...
  22. You need to physically eyeball where those traces...

    You need to physically eyeball where those traces are going. They could just be connected to a pull up. (Although being connected to a pull-up would at least imply that Sanyo anticipated they *might*...
  23. Trace it. NC pins are often connected to ground....

    Trace it. NC pins are often connected to ground. If it goes to something that's not ground then maybe you have a hope.
  24. As discussed in the other thread, just changing...

    As discussed in the other thread, just changing the 64k chips for 256k ones isn't going to magically result in the machine seeing more memory. The short version is this. Here's the pinouts of the...
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    Back in the early 'aughts the Weirdstuffs of the...

    Back in the early 'aughts the Weirdstuffs of the world had stacks of small Alpha systems; couldn't swing a dead cat without hitting a DEC Multia. I'll admit I turned down several opportunities to...
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