Search found 775 matches

by iss
Thu Feb 28, 2019 4:24 pm
Forum: Technical questions
Topic: Dead oric 1
Replies: 48
Views: 1774

Re: Dead oric 1

Stop! 2m is too small and can damage the multi-meter!
You can use 20m/10A - but put the probe in the other hole as on picture (where is a label 10A).
amper1.jpg
amper1.jpg (37.09 KiB) Viewed 403 times
by iss
Thu Feb 28, 2019 4:01 pm
Forum: Technical questions
Topic: Dead oric 1
Replies: 48
Views: 1774

Re: Dead oric 1

Traindriver69 wrote:
Thu Feb 28, 2019 2:55 pm
both ic10 and 11 reading 5.10v
Cool! 7905 is working fine and the board is powered OK.

To measure the drawn current use:
amper.jpg
Be careful: set the multimeter to 2A (or 2000mA).
by iss
Thu Feb 28, 2019 2:40 pm
Forum: Technical questions
Topic: Dead oric 1
Replies: 48
Views: 1774

Re: Dead oric 1

Just checked the points on the board that iss said to check and IC10 the red arrow point is measuring 9.6v IC10 the black arrow point is measuring 4,4v IC11 point is showing 8.93v Sorry if I mislead you - to measure the voltage in above picture put the black test probe where the black arrow points ...
by iss
Tue Feb 26, 2019 10:07 pm
Forum: Technical questions
Topic: Dead oric 1
Replies: 48
Views: 1774

Re: Dead oric 1

1.jpg On picture above frames 1 and 2 (yellow numbers) are reference to easy follow the tracks around the 7905 regulator. Frame #3 shows how you need to restore the broken track. Did you restore it properly? On frame #4 are two possible places (easy to reach) to measure the supplied voltage after t...
by iss
Tue Feb 19, 2019 11:09 am
Forum: Cross development tools
Topic: Better code generation (for CC65)
Replies: 8
Views: 655

Re: Better code generation (for CC65)

@NekoNoNiaow: I didn't understand from pictures is any difference between -O3 and opt65 output?

Else, I've tested -O3 option and there is real benefit in size. No bugs so far but I've compiled only 3-4 samples...
by iss
Tue Feb 19, 2019 11:01 am
Forum: Demos
Topic: OricExos - making the impossible
Replies: 113
Views: 11144

Re: OricExos - making the impossible

"pp buffer" is the additional Parallel Port buffering on the extension board. It's a standard 74LS245 chip i.e. 8-bit bidirectional buffer with 3 states output and is connected to VIAs port A. This allows PSG programming AND high-speed 8-bit bidirectional Parallel Port communication between master a...
by iss
Mon Feb 18, 2019 10:01 pm
Forum: Demos
Topic: OricExos - making the impossible
Replies: 113
Views: 11144

Re: OricExos - making the impossible

Ok, and how do you switch from one mode to the other, how many cycles does that take, can I change every line, multiple time per scanline, etc... without generating snow or effects like that? Or should that be just on a per-frame thing? Ha-ha, this starts to be crazy even for me ;) WIP source here:...
by iss
Mon Feb 18, 2019 9:24 pm
Forum: Technical questions
Topic: Microdisc connectors
Replies: 17
Views: 3515

Re: Microdisc connectors

But let's go back to the PSU :)... Previously I've posted in this thread picture of my Oric+Microdisc PSU in bad condition. And here is my Telestrat PSU in even worse condition: psu1.jpg Unfortunately I've got it as in the picture - all wires are cut, the transformer is in rust and what can't be see...
by iss
Mon Feb 18, 2019 8:58 pm
Forum: Demos
Topic: OricExos - making the impossible
Replies: 113
Views: 11144

Re: OricExos - making the impossible

For the audio - it's OK, both options are easy but what type of connectors do you need, so I can prepare them? I think the pseudo-code formulas to describe the mix are: Direct connect: - Fast mode: Ro = RI0 or RI1 or RI2 or RI3 Go = GI0 or GI1 or GI2 or GI3 Bo = BI0 or BI1 or BI2 or BI3 - Low color ...
by iss
Mon Feb 18, 2019 8:41 pm
Forum: Technical questions
Topic: Microdisc connectors
Replies: 17
Views: 3515

Re: Microdisc connectors

... why the Telestrat needs the -12, I suppose for the RS-232 port That's right, it's only for the RS232 compatible output. Interesting remark can be found on Telestarat's schematic: " le -12V sera fourni par l'alimentation (PL6) à partir du N°1000 " Which tells that for serial numbers below 1000, ...
by iss
Mon Feb 18, 2019 7:33 pm
Forum: Demos
Topic: OricExos - making the impossible
Replies: 113
Views: 11144

Re: OricExos - making the impossible

... а transparent case, with some blinking things Yep, just like Blake's Orac :). So, two questions: - What did you finally came up with for the soundchips: Mono, Stereo (and if Stereo, how is it split?) - What are the video mixing algorithms you have implemented All 4 sound output are "as is" - st...
by iss
Mon Feb 18, 2019 12:04 am
Forum: Demos
Topic: OricExos - making the impossible
Replies: 113
Views: 11144

Re: OricExos - making the impossible

OricExos-preview.jpg OricExos with extensions, PAL encoder board and cumulus - everything works! As you can see the PAL encoder board has Composite, S-Video and RGB outputs. The signal amplitude from the RGB output is bit low, so I have to add an extra video amplifier - AD8013. This was the last ch...
by iss
Sun Feb 17, 2019 11:16 pm
Forum: Technical questions
Topic: Microdisc connectors
Replies: 17
Views: 3515

Re: Microdisc connectors

Nice info about Telestrat and Microdisc connectors:
A la Decouverte du Telestrat.pdf (with subscription) and DES DRIVES POUR VOTRE ORIC.
Here is the summary:
psu.png
I've rotated the connectors on the right to match the left picture.
So, the hand-written notes on your pictures are confirmed. :)
by iss
Sat Feb 16, 2019 9:53 pm
Forum: Tape and floppy disk converters
Topic: Novalight - very fast tape loading
Replies: 68
Views: 2852

Re: Novalight - very fast tape loading

I'm still not familiar with the Novalight code - it's complex and requires lot concentration. But this 7 bytes should be needed only if the next part starts with the standard header, right? I'm not sure but maybe it makes sense to have a kind of synchronization between parts... and 7 bytes are not s...
by iss
Sat Feb 16, 2019 9:32 pm
Forum: Hardware hacks and extensions
Topic: Oric-1 Sound Mod HELP !
Replies: 13
Views: 793

Re: Oric-1 Sound Mod HELP !

Check the cable from RCA to the 1084 monitor, check the switch on the 1084's back (if any) - is it in correct position? Check again if the switch makes good connection in both positions - measure the resistance between the middle pin and the other two. BTW, check the resistance between the left and ...