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Sep 10,2020
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ZX Spectrum 48 Issue 3B Redrawn

1:1 clone of ZX Spectrum 48 Issue 3B mainboard...
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Published: Sep 10,2020
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Topic
DIY Electronics
Hardware
Computers & USB
Retro Sinclair ZX Spectrum DIY ZX Spectrum 48
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  • Good evening PABB, Actually, it happens also in the PCBWay viewer. I mean the problem, so if the PCBWay viewer shows the problem, when ordering a bunch of boards are they coming with this interpreation mistake too? Thank you :)

    Nov 16,20220 Comments
    Reply

  • It's a problem with the settings of the gerber browsers. Below you will find a screenshot of the project in SprintLayout :)

    Nov 10,20220 Comments
    Reply

  • Good evening PABB. The last revision has some issues with some lines that overlays holes/connections. At least it is what some gerbers viewers shows... The picture shows some of them (but not all). Is it a mistake from viewers? Thanks for your work

    Nov 09,20220 Comments
    Reply

  • Is there any way of getting the original files to modify them? Want to make a version to easier allow for different sized Capacitors to be able to use ones that are still manufactured, especially ones in positions such as C1.

    Aug 12,20210 Comments
    Reply

  • is it possible to make a pcb for two types of capacitors? For axial and ordinary threaded.

    Mar 15,20213 Comments
    PABB 2021-03-18 02:14:00Reply

    I'll check if there is enough free space on PCB :)

    Engineer 2021-03-19 04:49:12Reply

    I would suggest adding a power modification that was introduced in issue4b and later models. Safeguarding the memory of our zx. http://8and16bit.blogspot.com/2019/08/zx-spectrum-16k-48k-and-plus-models-dc.html?m=1

    Silverio Manuel Rosales Santana 2021-03-31 03:54:50Reply
    Reply@ Engineer：

    That doesn't safeguarding the memories. In fact I have some Issue6A that very often get burned TRs and destroy some Low Memory ICs. By what I have seen repairing boards... Issue3B is the most reliable, at least has a minor number of problems.

    Reply

  • Nice to read you again PABB, I have seen also your adaptor for EPROM, my suggestion in this line is a revision of this board already with the points to be able to use it with a ROM or EPROM. For my experience the easiest way is similar to how could be done in a Issue6A. Of course by jumper that also could be converted in an external switch by the user if it is desirable. Another good improvement could be two holes where solder in directly a reset or a jumper (corned). Here is a little photo of my implementation just an idea pretty similar to yours, nothing special.

    Mar 31,20210 Comments
    Reply

  • Hi. I just uploaded your gerber files for production and the engineer says that the silkscreen layer is missing from the files.

    Jan 15,20212 Comments
    PABB 2021-01-16 19:32:47Reply

    Hi Dimitrios. Please, ask an engineer to check it once more - I'm pretty sure, that all necessary layers are present in a project (I've checked it a few minutes ago - it's OK) :) Silkscreen files are named - "ZX Spectrum Issue 3B v6 rev3 - solder mask_silkscreen_top.gbr", "ZX Spectrum Issue 3B v6 rev3 - solder mask_silkscreen_bottom.gbr" Let me know if you'll have any problems...

    DIMITRIOS PALLIS 2021-01-17 20:14:14Reply

    Thank you very much!

    Reply
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