Found it!
viewtopic.php?t=2910
Perhaps I'll do something like THIS instead:
https://www.sinclairzxworld.com/viewtopic.php?t=1793
It would be far more useful for the game controller to map to the keys but in a neat way.
ZX80 Joystick Interface
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Re: ZX80 Joystick Interface
ZX80/ZX81/ZX Spectrum
Re: ZX80 Joystick Interface
Oh - that’s my thread
Re: ZX80 Joystick Interface
http://forum.tlienhard.com/phpBB3/viewt ... key#p36489
And to that interface I have connected a JoyKey bought from the German ZX-Team. Here you can associate any key for any direction.
And to that interface I have connected a JoyKey bought from the German ZX-Team. Here you can associate any key for any direction.
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Re: ZX80 Joystick Interface
Is this for a ZX80, a ZX81 or a ZX Spectrum?albertusj wrote: ↑Thu Jul 04, 2019 3:05 pm Perhaps I'll do something like THIS instead:
https://www.sinclairzxworld.com/viewtopic.php?t=1793
It would be far more useful for the game controller to map to the keys but in a neat way.
Only there may be a problem...
On a ZX80
Why you can’t connect an external keyboard or a joystick mapped to any of the keyboard keys to the expansion edge-connector and expect it to work...
On the ZX80 board, IC10, a 74LS365 provides the Ear and keyboard data to the Z80 CPU.
The 74LS365 will override any data on the expansion port at any I/O address that it responds to.
So unless you remove this chip, you will not be able to use an external keyboard or a joystick mapped to any of the keyboard keys that is connected to the expansion edge-connector.
On a ZX81 or ZX Spectrum model that uses a Ferranti ULA (16K, 48K, plus, 128K (toastrack), +2 (grey)
There is no problem using either an external keyboard, or a joystick interface that maps to the keyboard via the expansion edge-connector, as the ULA chips don’t override an external keyboard / joystick interface unless of course you press a key on the computer’s original keyboard...
ZX Spectrum +2A, +2B, +3 or +3B
A similar problem to the ZX80, only this time, the problem is the Amstrad designed gate array chip.
Mark
ZX81 Variations
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ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: ZX80 Joystick Interface
Surely it would make more sense for a new joystick interface to support the same joystick controls as the ZXPand+ - the ZXPand+ seems to be one of the most widely used interfaces on a ZX80 and ZX81 today (because of SD support); so it makes sense to mimic it's joystick support
Rich Mellor
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RWAP Software
RWAP Adventures
SellMyRetro
Retro-Printer Module
Also Involved in:
Icephorm
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Re: ZX80 Joystick Interface
Thank you, everyone. I'm building the interface to be Kempston compatible.
ZX80/ZX81/ZX Spectrum