Back with another ZX Spectrum 128K "Toastrack" repair, but this time looking into "jailbar" reduction as well with some interesting results.
https://www.youtube.com/watch?v=dHwfmXuucQU
Video: ZX Spectrum 128K Toastrack Repair and Jailbar Reduction
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Ast A. Moore
- Rick Dangerous
- Posts: 2641
- Joined: Mon Nov 13, 2017 3:16 pm
Re: Video: ZX Spectrum 128K Toastrack Repair and Jailbar Reduction
Yeah, when I came up with the values and placement of the extra filtering capacitors, I was just experimenting. After changing C28 and adding two 1 µF ceramic capacitors to IC12 and IC13, I saw the biggest improvement. I decided not to continue or instal 1 µF caps on all RAM chips, though, as the visual gain was marginal at that point.
I’m glad it worked so well for you, too!
P.S. Mine is a 6U board. Don’t think it makes much of a difference. The general trace routing is about the same.
Here’s the before and after pic from my original tweet:
I’m glad it worked so well for you, too!
P.S. Mine is a 6U board. Don’t think it makes much of a difference. The general trace routing is about the same.
Here’s the before and after pic from my original tweet:
Every man should plant a tree, build a house, and write a ZX Spectrum game.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Re: Video: ZX Spectrum 128K Toastrack Repair and Jailbar Reduction
My grey +2 has a mild case of jailbars through the RGB. Is there a similar fix?