From a technical reason I seem to remember the faster Chips are only required for d6. But as each chip has 4 bits it's half the RAM involved.
There is a thread about the recreated PCB covering all this in this forum. Maybe a short search will help you.
Kind regards Paul
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After some discussion with Charlie, finding the proper card edge connector with the long pins may be the biggest challenge with my re-creation project. Hopefully it won't be a show stopper, but so far my searches have not been fruitful. More searching to be done.
Why do you need long pins?mhudson52 wrote: ↑Wed Dec 20, 2017 2:59 pm After some discussion with Charlie, finding the proper card edge connector with the long pins may be the biggest challenge with my re-creation project. Hopefully it won't be a show stopper, but so far my searches have not been fruitful. More searching to be done.
I have some if you like but they are awful qualitiy, Well 80ies standard
If you want to have a little distance between the PCB and the Edge connector (as seen on pictures) you can use short pin high quality edge connectors (which I can also supply) and just let them touch the PCB instead of pushing the pins through the holes as normal. Todays PCBs are connected through so no problem then.If you use manually etched PCBs, that a different story.
You can also put them in half if its enough for you.
Functional the extra distance isn't necessary.
I have three boards being made made at OSHpark which ought to be here on the 29th. Really looking forward to seeing them.
Well Charlie, now I know what I'm getting for Christmas!
The 3D printed case halves are perfectly sized for the PCBs, but will have to be resized for vacuum forming. Made good progress on the forming box during the holidays, but work is suspended until the weather comes out of this deep freeze.
So far have packs completed and only waiting on rivets to come in the next week or so. Upon initial testing on my TS1000, the magic "K" did not appear on the screen and once again had to call in for expert help (sirmorris). His Eagle eyes (pun intended) quickly found that two tracks crossed other tracks that shouldn't have. A little track cutting and jumper fixing solved the problem and the magic "K" appeared on the screen.
The only thing lacking is having the proper code to show that it is indeed yielding 3K of memory.
I found this post on the forum:
I used the formulas by both XavSnap and Andy with and without the Ram pack.
With the Ram pack, I got -13.473633 and 869 respectively.
Without it on my 2K TS I got 2K and 1893 respectively.
Could this be because I am using my TS instead of a ZX80 or ZX81?
Any help or suggestions will be greatly appreciated.