neazoi
Advanced Member level 6
Hello, I have a zx80/zx81 computer from the 80's and I have found a 3-port expansion bus for it. It is similar to the ISA bus but there are not so many pins like the ISA bus. The bus accepts different expansion cards on it.
As far as I can notice all the bus ports (connectors) are connected in parallel. This means that each pin of one port is connected to the same pin on the other ports. I.e. all the ports are tapped to a common bus.
here is the schematic of the computer without the expansion bus **broken link removed**
I was wondering, can I tap more ports (connectors) to the same bus in order to be able to connect more expansion cards to it?
What is the limitation to it, i.e how many of them can I add?
As far as I can notice all the bus ports (connectors) are connected in parallel. This means that each pin of one port is connected to the same pin on the other ports. I.e. all the ports are tapped to a common bus.
here is the schematic of the computer without the expansion bus **broken link removed**
I was wondering, can I tap more ports (connectors) to the same bus in order to be able to connect more expansion cards to it?
What is the limitation to it, i.e how many of them can I add?