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Type: Posts; User: Witchy

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  1. Replies
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    It didn't, if you read further back you'll see...

    It didn't, if you read further back you'll see that Larry spotted my image was one byte too long because I'd missed that one of the flags was two bytes not one. I got it working after that and posted...
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    Apologies folks, I haven't forgotten about this,...

    Apologies folks, I haven't forgotten about this, I've been sorting exhibits for a Japanese Festival this coming weekend and helping a very kind volunteer map out a replacement PCB so he can practice...
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    No problem! It's excellent to see them go to a...

    No problem! It's excellent to see them go to a good home :D [/COLOR]
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    It's nice to see everything's hanging together...

    It's nice to see everything's hanging together nicely!
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    My hookup, er, hooks arrived so I have an...

    My hookup, er, hooks arrived so I have an old-skool means of connecting up the arduino to try and sample what's going on. Happily I was chatting to the designer again today and he's asked for our...
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    Unfortunately you do, kind of. That big stack...

    Unfortunately you do, kind of. That big stack o'wires running up the centre of the schematic is the Emulator that controls all the I/O:

    52929

    The microcontroller at the heart of the emulator...
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    It's an NEC V20 so what's that, 8088? The machine...

    It's an NEC V20 so what's that, 8088? The machine actually runs a rewritten Unix V6 from ROM and the more I've learnt about it the more I've realised how complex it is. I've been talking to the...
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    I do have a complete ROM dump of my machine but...

    I do have a complete ROM dump of my machine but the trouble is the keyboard, RS232 et al are controlled by an external board called the Minerva Emulator, and while I have a dump for the boot ROM for...
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    If there's one thing I love about this hobby it's...

    If there's one thing I love about this hobby it's that things are always way more complicated than I think, I'm grateful to you and Chuck and the others I talk to in the process of bringing things...
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    I don't think it's as complicated as that, but...

    I don't think it's as complicated as that, but yes, hence my thought of just wiring in SK6 and SK7 to 24 ports of the Arduino MEGA256 I bought for this project initially (or finding one that's less...
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    It gets better, I suddenly realised I hadn't...

    It gets better, I suddenly realised I hadn't accounted for modifier keys so I added left shift and right shift to my little protoboard keyboard to see what they did with the analyser. I could've...
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    Sigh, so much for me thinking I could ignore Z5....

    Sigh, so much for me thinking I could ignore Z5. Writing out the lookup table I realised 6 bytes isn't enough for all the keys so I now need to detect the inhibit pin for Z4/Z5 and act accordingly.
    ...
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    The 4051s were just for me to play with on a...

    The 4051s were just for me to play with on a breadboard, I'd bought them before I found a video explaining how the chip works. Ordered some extra bits last night so I can start putting little...
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    Unexpected package in the mail today, I'd...

    Unexpected package in the mail today, I'd forgotten I'd ordered a couple of 4051s to play with. If only I'd ordered a pair of LS688s and an LS240 at the same time :)
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    Had some fun tonight. I discovered some anomalies...

    Had some fun tonight. I discovered some anomalies in my original decoding of the keyboard so the evening has been full of colour coded spreadsheets. I've still not finished the binary encoding side...
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    I think you're right with the count of 3 for a...

    I think you're right with the count of 3 for a debounce check, it initlally confused me as to which chip was scanned first but 3 scans can clearly be seen with an analyser. KBINT actually stays up...
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    I did type pretty much this out since the key...

    I did type pretty much this out since the key being pressed is the only thing that can make Z3, one of Z4/5 and Z6 all active at the same time, I've only just spotted it's gone from my reply so I've...
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    Easter weekend all done and dusted, I hope yours...

    Easter weekend all done and dusted, I hope yours was similarly fine weather wise and that you didn't damage limbs like I did!

    I can see why a '240 would be better than a '244 but I'm puzzled as...
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    I'm getting to like the idea of a pair of Nanos...

    I'm getting to like the idea of a pair of Nanos with an extra small board for an LS244, I have a few spares of both. This machine is never going to get used and abused since there's literally nothing...
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    Excellent stuff. I think we're both on keyboard...

    Excellent stuff. I think we're both on keyboard projects this weekend :)
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    Yep, spot on with SK6/SK7. VB is +5V, there's at...

    Yep, spot on with SK6/SK7. VB is +5V, there's at least two different power rails going on in that machine because it's designed to be permanently on. In normal usage you wake it up by lifting the LCD...
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    Gah, and I've realised that when I mapped out the...

    Gah, and I've realised that when I mapped out the keyboard I had it upside down compared to the schematic so all my key coordinates were backwards. Now that I've amended the spreadsheet the layout...
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    We're almost right I think, I'd completely...

    We're almost right I think, I'd completely overlooked Z6 and was puzzling why my analyser only shows a trace when a key is pressed - Z6 is strapped as an OR gate so if any of the 9 inputs fires it...
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    Thanks re: packing, I always anticipate Bad...

    Thanks re: packing, I always anticipate Bad Things happening to parcels so pack accordingly. I'm SO looking forward to seeing these working!
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    Sorry for the delay, I got waylaid by an NEC...

    Sorry for the delay, I got waylaid by an NEC PC8201A that someone mentioned had a rechargeable battery in so priority became replacing that and cleaning up the small amount of spillage then getting...
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