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Type: Posts; User: falter

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  1. Peach II clone missing left column of each text character

    I have a Peach clone board I got from vintagecomputermuseum. I believe he had attempted to fix it, failed (probably backwards charges eprom didn't help!), and then parted the whole thing out.
    ...
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    Thanks!! This happened in the context of trying...

    Thanks!! This happened in the context of trying to move my channel to a brand channel and separating my old personal videos from.the rest while deleting some orphaned accounts. I found a support...
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    Well, I'm a twit. Over the last 10 years I've...

    Well, I'm a twit.

    Over the last 10 years I've had a couple of 'Youtube' accounts with different gmail addresses I had and lost. Anyway, in an effort to clean up, I decided to delete one said...
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    I did a quick mod of the first program and got it...

    I did a quick mod of the first program and got it to write on half of the second page. I'm not sure if I was changing the compare line wrong. I tried setting it to 01 and then backed to 0F, which...
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    Okay so I tried changing the program to send data...

    Okay so I tried changing the program to send data to the other page, 0E00 .. but nothing came up on the second page. I changed it to 0D00 and got a half screen of HELLO WORLD. I tried 0F00 too but...
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    Cool! I'll try to reverse engineer that Hello...

    Cool! I'll try to reverse engineer that Hello World program and see if I can get it to do that.

    I wonder why you'd set up your display that way? Seems kind of unusual for a computer.
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    Something else I noticed with this machine - it...

    Something else I noticed with this machine - it has a 'Page' button. When you hit it, the monitor prompt disappears and the PAGE B light goes on. You get a blank screen and can't do anything. Hit...
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    Thank you! I might give that a try, actually. ...

    Thank you! I might give that a try, actually. Wouldn't mind fixing that 'GH TO' message, and just playing around with it a bit. I'll see where the A10 location goes.
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    It's pretty involved. I have it on my list of...

    It's pretty involved. I have it on my list of 'trace-it-outs'. :) But it'll take me a while.. I go crosseyed just looking at it.

    Is it me or is it strange that they only went with 1KB of RAM? ...
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    Here are pics of the machine in question if it...

    Here are pics of the machine in question if it helps further:

    https://drive.google.com/drive/folders/1FyowirLL2JBzZlrgj848zSn1f0LgSJhk?usp=sharing

    It's quite a well done little machine I think....
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    I plugged the eprom back in, fired up the...

    I plugged the eprom back in, fired up the computer, and checked every address against the dump and it appears to match. Which means I got lucky.. apparently the 2758 is a lower voltage version of...
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    I believe so, yes. The first available RAM seems...

    I believe so, yes. The first available RAM seems to be at 0x0400.

    It has direct video output.. I don't see a UART chip anywhere. It appears to have a video card of sorts built on one of the...
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    Here is a dump of the ROM if it helps. I hope...

    Here is a dump of the ROM if it helps. I hope it's a complete one - the EPROM is a 2758 which I read was 'upward compatible' with a 2716. The pinouts are mostly the same except A10. Not sure, but...
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    Z80 Hello World example in hex

    Hi guys,

    I am trying to learn a bit of programming for this z80 homered machine I have. It is completely homered in design and features a monitor that near as I can tell has only two commands:...
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    To me a Xerox HP tie up feels like the formation...

    To me a Xerox HP tie up feels like the formation of American Motors. It's two companies in decline merging to stay alive. I don't see either the document or PC business being much of a growth...
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    So most likely the abortive HP takeover was...

    So most likely the abortive HP takeover was probably about the printing side of their business more than anything else?
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    Many thanks for these. Would it be fair to...

    Many thanks for these.

    Would it be fair to critique Xerox's committment to personal computing as somewhat halfhearted? I'm thinking in particular of the 820 and the 'Sunrise' machines, the latter...
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    List of all Xerox computers

    Hi there,

    I am doing research for a video project and am trying to nail down exactly how many forays into computing Xerox had over the years. I've been trying to find a comprehensive list of all...
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    I'm wondering if there isn't a sneaky way to use...

    I'm wondering if there isn't a sneaky way to use color filters to take the red/blue layouts and create each side that way. Ie filter out the red, convert the blue to black, then vice versa to have...
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    I was just curious if they had actually put out...

    I was just curious if they had actually put out full PCB plans. I've not seen a lot of S100 stuff come out that way.
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    Whoops.. Popular Electronics. It says 'the...

    Whoops.. Popular Electronics.

    It says 'the schematics and foil patterns are available free of charge..'.

    They do have the red and blue patterns in the later assembly guides but I'm not sure how...
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    Cromemco Dazzler Foil patterns

    Was just reading the Feb 76 article on the above and it noted that you could mail in for a free booklet that had the foil patterns for both boards inside, presumably to etch your own. Does anyone...
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    Your fake solar calculator video did amazing too....

    Your fake solar calculator video did amazing too. But that one I can kind of understand... I had no idea people were faking that at all. That was a great video/eye opener!
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    Appreciate the feedback! I did spend some time...

    Appreciate the feedback! I did spend some time on that backdrop to make it feel more... well... real? I was actually surprised at how well it jived with the actual footage being greenscreened in...
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    Can you undelete on a QIC?

    I have a tape from 1993 that at one time contained a backup of my Bulletin Board System. It was used with a Backpack drive. It's been at least 20 years since I even laid eyes on it, but I seem to...
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