Building a Klyball 470K

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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Building a Klyball 470K

Post by Jeff » Tue Apr 02, 2019 3:39 am

To add memory and floppies to my C4P replica build I have decided to use the 470K.

This thread will document the board and the build.

In this build, I plan to use the RAM and ROM on the 470K and not use the ROMS and 2114's on the 502 board. Should be interesting!

/Jeff
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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building a Klyball 470K

Post by Jeff » Tue Apr 02, 2019 3:47 am

Here are photos of the bare board.

Top:
top bare small.jpeg
top bare small.jpeg (338.01 KiB) Viewed 1512 times
Bottom:
bottom bare small.jpeg
bottom bare small.jpeg (341.84 KiB) Viewed 1512 times
/Jeff
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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building a Klyball 470K

Post by Jeff » Tue Apr 02, 2019 3:51 am

Here is the current parts layout.... It is a work in progress and I will upload updates as they happen.
Parts Layout small.jpeg
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/Jeff
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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building a Klyball 470K

Post by Jeff » Tue Apr 02, 2019 3:57 am

Progress so far...
470 progress.jpeg
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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building a Klyball 470K

Post by Jeff » Fri Apr 26, 2019 10:58 pm

More parts added. just missing a few caps.
470z.jpg
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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building a Klyball 470K

Post by Jeff » Tue Apr 30, 2019 1:02 am

I double-checked my work.

I discovered that the 500 0.1uf caps I bought (probably from china) weren't actually 0.1uf. They had a part number of 104 on them, which should be 0.1uf, but when I tested them, (and I tested many of them!) they measured 0.05uf! So I had to de-solder them all and install correct ones. I have now adopted a policy of testing my parts before installing them.

Here is the board so far. I am only missing one capacitor now. You will notice that all the little orange caps have been replaced with tan coloured ones.
470z.png
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/Jeff
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Jeff
Posts: 330
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building a Klyball 470K

Post by Jeff » Mon Sep 09, 2019 11:24 pm

I have populated just enough of the board to add memory to the system. There is 4K on the 502, and I programmed the GAL on the 470K to extend the ram to 40K (just below BASIC IN ROM)
40K Screen.jpg
40K Screen.jpg (616.95 KiB) Viewed 161 times
Here is a photo of the board so far.
470z Progress - 40K RAM.jpg
470z Progress - 40K RAM.jpg (1.16 MiB) Viewed 161 times
/Jeff
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