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Type: Posts; User: Eudimorphodon

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  1. Replies
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    61

    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. ;)
  2. Replies
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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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    188

    ... 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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    473

    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...
  12. 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...
  13. 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...
  14. 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...
  17. 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*...
  18. 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.
  19. 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...
  21. Of course, yeah, if you had the schematic of the...

    Of course, yeah, if you had the schematic of the machine engineering an upgrade to denser RAM would probably be pretty trivial. But without it there’s likely to be a lot of fiddley trace tracing.
    ...
  22. That's *almost certainly* not going to affect the...

    That's *almost certainly* not going to affect the hardware that controls the memory sockets.



    Yes. And only the later versions of the IBM *XT* supported putting 640k on the motherboard out of...
  23. ... Does this Sanyo machine actually have the...

    ... Does this Sanyo machine actually have the hardware to let you plop 1MB's worth of 256kbit chips in in place of what I assume is 4 banks of 64kbit chips and convert anything over 640k to actual...
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    I did have the joyful experience a few months ago...

    I did have the joyful experience a few months ago of having to repair an Ubuntu machine that went down un-cleanly when the virtual machine host it was on blew up and for *some* reason grub had at...
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    Thank you. May I humbly suggest that if someone...

    Thank you. May I humbly suggest that if someone has problems understanding why perhaps they should look at the "Stay close to the original topic being discussed" and "Contribute something meaningful"...
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