German - ZX81 Backplane project 2017

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German - ZX81 Backplane project 2017

Post by tokabln » Sat Dec 02, 2017 9:51 pm

Dear folks,

during 2017 I started to develop some ZX81 extensions based on past developments done by the German ZX team, because I'd like to use a backplane holding a couple of differnet cards using the so called ZX96 connection, while some german folks where in favour for this, too.

Below you'll see a small picture showing the bus system as well as some cards connected to the system.
ZX81 - BusDriver & Backplane Gespann #4 640x480.jpg
ZX81 - BusDriver & Backplane Gespann #4 640x480.jpg (303.51 KiB) Viewed 276 times
I need to mention that there are still some problems with a card called "BP005 - H4TH VDrive Board" when it's used together with the BP001 - Bus Driver card. I hope to solve this during winter time.

To make a long story short... I'd like to ask if there is some interest by the UK community, too? If so, I might offer PCBs and/or parts in 2018.

So here's a link to a drop box document I've written which is actually hosted by Paul (many thanks for that) ... 1.pdf?dl=0#

and here you can see the German thread (sorry as this is mostly in german language) ... +Backplane

If there will be some interest, I will recalculate estimated PCB / parts and shipping costs.

Kind regards... Torsten

Update: I forgot to mention... we still face some timing issues with pokemon's ZX Blast Card... while this is under investigation.
Kind regards Torsten (Berlin)
BMZ MFA, ZX80Core/More, AX81, ZX81, ZX81NU, Spectrum+, Harlequin, Amstrad NC100, Z88, C64, C128D, Amiga 500, Amiga 1200, Atari Portfolio, HP200LX, IBM PC 5155, TP755c, T41, PS/2 (Model 40SX), PS/2E, Accura 101, Apple //e

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Re: German - ZX81 Backplane project 2017

Post by sirmorris » Sun Dec 03, 2017 12:23 am

Hi Torsten! This looks great - nice work!

I'll follow with interest over at tlienhard. It's not the kind of thing I play with but I recognise a nice toy when I see one :D
--=== ZXpand+ ... A more moderner all-in-one upgrade solution for ZX81 ===--
* SD/MMC storage * 32K Hires-capable RAM * AY sound chip * Joystick port * Serial *
* BASIC enhancements - plug & play * Reset button * Auto-boot facility *

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