I received the ZX81 Interface S-Pack from DCP Micro Developments as a gift. This is a speech output interface based on the DIGITALKER chip developed by Forrest Mozer and licensed to National Semiconductor.
The digitized speech is on an extra chip and offers 70 words. There are supposed to be three more chips. The sockets are already on the board. The designation of the chips is SSR1-SSR6, but it is not certain that SSR3 and SSR4 really exist.
Unfortunately, no instructions were included with the device, so I do not know how it is controlled. The Spectrum version of the device should be able to be used with e.g. OUT 255,34.
A small programme from the German Sinclair Forum - Basic and machine language has not yet been successful.
The S-Pack does not announce "This is Digitalker" via the internal main speaker when it is switched on.
S-Pack DCP Micro developments
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Re: S-Pack DCP Micro developments
Well the glue logic chips are:
74LS02 quad 2-input NOR gate
74LS32 quad 2-input OR gate
74LS74 dual D positive edge triggered flip-flop, asynchronous preset and clear
So the address decoding should not be too complex. If it uses /IORQ then machine code is needed to access it. But this ZX81 version may use /MREQ so that it is memory mapped, then POKE can be used.
Mark
74LS02 quad 2-input NOR gate
74LS32 quad 2-input OR gate
74LS74 dual D positive edge triggered flip-flop, asynchronous preset and clear
So the address decoding should not be too complex. If it uses /IORQ then machine code is needed to access it. But this ZX81 version may use /MREQ so that it is memory mapped, then POKE can be used.
Mark
ZX81 Variations
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.
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: S-Pack DCP Micro developments
I also have one of these and I have no idea how to use it, did you ever get it to work?
All I've been able to find is there are supposedly 2 ports mapped at 49148 and 49149 and the expectation was using POKE, but I have no idea what to do with them and have found no examples.
Edit: 49148 doesn't appear to do anything but I realised I hadn't tried 49149 right after I typed this.
POKE 49149,1 will make it say "one"!
All I've been able to find is there are supposedly 2 ports mapped at 49148 and 49149 and the expectation was using POKE, but I have no idea what to do with them and have found no examples.
Edit: 49148 doesn't appear to do anything but I realised I hadn't tried 49149 right after I typed this.
POKE 49149,1 will make it say "one"!
Re: S-Pack DCP Micro developments
Does anyone have the additional ROM chips? Mine just has the starter one installed with 70 words.
Re: S-Pack DCP Micro developments
Found the manual.