Sinclair ZX80 / ZX81 / Z88 Forums

I'm also looking for ideas or perhaps a schematic with docs for using the HC-SR204 Ultrasonic Transceiver Board. I will be using 3 of the boards as part of the navigation/object avoidance system... I already have a working Infrared system working that will provide additional control to the navigatio...

I'll be using the 8 bit data bus so what I am looking for is 8 bits in and 8 bits out,but with the inclusion of device select codes, one for each device to turn it off or on to send or receive data...simple,but effective... I'm looking for a schematic of what I stated above,but if you have something...

Thanks for all the help...I have tons of 74LSXX and 74HCTXX,and since I'm looking for the
greatest amount of power conservation in a robotics project,74HCT Series it is...

Now to decide between the Z84C20 PIO which I have 20 or to use the 82C55 as device
controllers??

In designing any peripheral what is the logic family of choice,74LS,74HC,or 74HCT??

Definitely a very nice I/O Board...I do ask tho' would this be for a single peripheral board to control
such as a AY3-8910,12,SPO256A-AL2 addon? I ask because I saw that has no expansion device select coding
for multiple add ons?

Thanks for clearing up my mystery Siggi...

Thank you for the info... I'm looking at the barebones 64K upgrade without the Rom Patch is that the same diagram you are referencing?? Also would it be necessary to connect the /RD to the /OE?? Just trying to keep board size and designing to a minimum...I am assuming that all the diodes referenced ...

Heatsink silicone is an obvious need whenever heatsinks are used for thermal transfer...

So what would you suggest for a bare bones 64K upgrade to a Zeddy??
I am building a parabot,(everyone else would call it a robot),I have a
8K NVRAM board already completed that will be in the 8192-16384 region to
which I will use for the machine code routines...

I found 2 64K upgrade wihich are of Wilf's and thought they would be easier to construct and implement...