Chartreuse / is on Nostr

Just another old computer loving fur. Homebrew computers, vintage computers, repair, and programming.

He/Him

Previous Account: https://mastodon.sdf.org/@ChartreuseK
Website: https://ckits.ca/
Birdsite: https://twitter.com/ChartreuseK
Pronouns: He/Him/They

Last Notes

2024-10-01 18:22:41

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really isnt much better currently than if the source code had just leaked somehow.
Or like that license microsoft originally put the old dos source code under, the academic one

2024-09-11 14:19:59

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everything online has become DB. Which I guess works for the most part since most pin counts correspond to a single common shell. Like how 37 is a DC 37 basically without fail.
Though there is DA15 (gameport or classic mac video) vs DB15HD (vga)

2024-09-01 23:37:19

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Could either be the "I Spy" series of books or "Look-Alikes: The More You Look, the More You See! " by Joan Steiner.
The later is the one I was thinking of that might be it
https://social.restless.systems/system/media_attachments/files/113/064/921/955/507/080/original/36e473a07029a877.png

2024-08-18 02:44:15

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Between the pad height and the solder mask height, I think there's still a slight difference there, though it's probably small enough the solder won't have issues bridging. Like <1thou or such

2024-08-18 02:42:29

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My feeling is it's probably a bad idea, but it'd probably work. There'd be a height difference possibly making it harder to solder, but that'd be small. The other issue is the loose pins could easily be damaged and pushed into enough other.

2024-07-08 20:54:19

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As long as it's better than the cheap no-name clones you can get on amazon/ebay/aliexpress still, that's a good improvement. Those have pretty poor button feel and build quality.

2024-07-07 20:16:11

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I'll get these all up on my GitHub soon, for now just the z80 is on there. https://github.com/ChartreuseK/RC2014-Z80-CLK-RES
They're currently untested though until I get my hands on the rest of the boards built.

2024-07-07 20:11:06

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A 6850 based UART board (has baud rate dividers for common rates done with dip switches), and a z80 cpu board with a power on reset circuit.
And finally a z80 CPU board which just arrived on Friday (was the first designed and ordered).
https://social.restless.systems/system/media_attachments/files/112/747/019/192/058/964/original/600c6aa62106530f.png
https://social.restless.systems/system/media_attachments/files/112/747/023/620/033/378/original/3512cc9e1d8ee18d.png

2024-07-07 20:09:09

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Also threw together a modified version of the 8255 based IDE adapter based on the schematic (added pin 20 power, and jumpers for setting the base address) .
A 6845 video terminal adapter (dual board set) based on my Fennec 6800 VTI circuit.
A 82077SL based floppy controller.
https://social.restless.systems/system/media_attachments/files/112/747/002/097/437/980/original/197483d35bd85727.png
https://social.restless.systems/system/media_attachments/files/112/747/004/198/274/520/original/17c510c4dedac9c4.png
https://social.restless.systems/system/media_attachments/files/112/747/007/446/181/684/original/0643a0b069949902.png
https://social.restless.systems/system/media_attachments/files/112/747/009/438/195/708/original/e7654678afe53b37.png

2024-07-07 19:55:53

Been kind of on an odd kick of making @npub14su…09w8 compatible modules since @npub1y7j…hczt convinced me of a project with it. Spent last night routing a quad UART (16C554) board with full modem control lines for each. Was quite tight to fit in the ~50x100mm board profile.
Now just need to wait a few weeks for it to be made an delivered, that's the hardest part.
https://social.restless.systems/system/media_attachments/files/112/746/938/508/200/532/original/af6a63021da0ffc7.png

2024-07-05 03:47:50

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Interesting that the code there has a mix of indent styles, such that your tabstop is different than the hard coded spaces.

2024-06-16 04:53:32

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Only difference I'm noticing is the green changing for black.
A thought I'm having there is if you're leaving green high during any of the blanking or such maybe the CRT there is treating it like it's a sync-on-green signal and muting the green down.

2024-06-15 15:52:35

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Every small platform specific thing slowly locks you in on any platform. It slowly becomes: I want to switch but I use xyz. While they slowly add more and more xyz to lock themselves further in.

2024-04-28 21:17:59

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I believe there are 16-bit wide ram ic's out there with dual chip selects that would be suitable for that configuration too, or just dual 8-bit. For 16-bit systems you do want dual chip selects on the pinout at least, even if the module uses something different. If you have an extra pin then maybe one for controlling a refresh signal on PSRAM's

2024-04-28 21:11:45

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Honestly not a terrible thing, especially as the options for large parallel sram in DIP are limiting/expensive (AS5C4008), while TSSOP and similar SMD are fairly plentiful and tend to be cheaper.
A dual row pin header is certainly hobbyist friendly (except for breadboards) and would keep the size down.