Hello, after years of owning a TS1500 and not daring to open it because it's in perfect condition I was able to buy a broken TS1500 in near mint condition. This had to be opened in order to be repaired.
I was lucky, it was just a broken Z80 that was socketed and a brittle membrane.
I made a composite mod and want to change it from 60Hz to 50Hz.
Does anybody know which resistor number it is in a TS1500?
Kind regards Paul
TS1500 50Hz which resistor
TS1500 50Hz which resistor
In theory, there is no difference between theory and practice. But, in practice, there is.
Re: TS1500 50Hz which resistor
Not certain it can be done that way, least i never was able on my ts1500, however you can use and external rom and hardcode it for 50hz
regards Andy
regards Andy
what's that Smell.... smells like fresh flux and solder fumes...
Re: TS1500 50Hz which resistor
Hi Andy, I guess it would be possible internally as well?
Which bytes have to be changed?
Do you know how the channel 2/3 selection works? Maybe this could be (ab)used for ROM switching?
Kind regards Paul
Which bytes have to be changed?
Do you know how the channel 2/3 selection works? Maybe this could be (ab)used for ROM switching?
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
- 1024MAK
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Re: TS1500 50Hz which resistor
Somewhere I’ve come across some comments from someone who wanted to do the same thing with his TS1500. If I remember correctly, although the ‘ULA’/gate array has a pin that is supposed to be the 50/60Hz input selection, changing the logic level made no difference.
I can’t for the life of me remember where I read about this.
Mark
I can’t for the life of me remember where I read about this.
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: TS1500 50Hz which resistor
Nice idea, worth looking into for sure.
what's that Smell.... smells like fresh flux and solder fumes...
Re: TS1500 50Hz which resistor
Inside the "Modulator" case there is a diode in the left front corner. The left pin of which is either 5V or 0V depending on channel selection.
I guess I don't need 60hz. Maybe I make an internal ROM with bigbang and sponzy. Black and white spectrum in a TS1500 case - crazy enough to get it done.
I guess I don't need 60hz. Maybe I make an internal ROM with bigbang and sponzy. Black and white spectrum in a TS1500 case - crazy enough to get it done.
In theory, there is no difference between theory and practice. But, in practice, there is.
- 1024MAK
- Posts: 5103
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: TS1500 50Hz which resistor
Found it, read through this thread1024MAK wrote: ↑Mon Apr 01, 2019 12:03 pm Somewhere I’ve come across some comments from someone who wanted to do the same thing with his TS1500. If I remember correctly, although the ‘ULA’/gate array has a pin that is supposed to be the 50/60Hz input selection, changing the logic level made no difference.
I can’t for the life of me remember where I read about this.
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.