Search found 255 matches

by aotta
Sun Jul 05, 2020 4:33 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Great work IanB! But the cpld update works with the old analog board (with bottom ic added) too? Yes it works with the old analog board I've a Max9144 left from one of your old pcb version, it seems having same pinout and characteristic of Max9108, do you think i can use it for adding the IC7 to my...
by aotta
Sun Jul 05, 2020 11:10 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Great work IanB! But the cpld update works with the old analog board (with bottom ic added) too? Else if, i'd like buy one of your new jlc board (hoping it will cost less than the ones I bought from pcbway! :wink: ) And, new sw versions works with other TI graphics video chips too (I.e. Msx, sega sc...
by aotta
Sat Jun 13, 2020 12:28 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

IanB wrote:
Sat Jun 13, 2020 12:00 am
BTW I've added a new page to the wiki with cabling details for all supported machines:
https://github.com/hoglet67/RGBtoHDMI/wiki/Cables
That's very useful, thank you!
by aotta
Sun Jun 07, 2020 5:43 pm
Forum: 8-bit acorn hardware
Topic: Beeb micro doesn't reset at boot
Replies: 8
Views: 316

Re: Beeb micro doesn't reset at boot

Nothing to do: it seems i can't charge pin 2 nor pin 6 and 7 to voltage greater than 1.6v.. so N555 pin 3 go high and stay so, or sometime floats but with no apparent reasong. I get some decent pulse only rare times, at cold start. I changed everything about timer circuit, except the C6. I have 5v a...
by aotta
Sun Jun 07, 2020 12:25 pm
Forum: 8-bit acorn hardware
Topic: Beeb micro doesn't reset at boot
Replies: 8
Views: 316

Re: Beeb micro doesn't reset at boot

At first test with multimeter, 555's pin 2 goes to 3,5v, drop to 0v when break preassed and return to 3.5v. Pin 3 start at 1.6v, goes to 5v when triggered by pin2, but rest to 5v for minutes... Already changed C8, now i'll replace R21 and will made further test. In previous post i probed CPU reset p...
by aotta
Sat Jun 06, 2020 10:20 pm
Forum: 8-bit acorn hardware
Topic: Beeb micro doesn't reset at boot
Replies: 8
Views: 316

Re: Beeb micro doesn't reset at boot

Kazzle, really useful, as always, your info! I made more test, changed C24 and R13 (with a 1.2mega resistor, i didn't found a 1M, but i think it could only change the timing) and, and it made the big difference, changing the keyboard with a know woking one (the old one has an old wire repairing behi...
by aotta
Sat Jun 06, 2020 10:26 am
Forum: 8-bit acorn hardware
Topic: Beeb micro doesn't reset at boot
Replies: 8
Views: 316

Re: Beeb micro doesn't reset at boot

Thank you Kazzle for the info, this are the IC16 pins at boot, pressing break key (or shorting rst sw) do nothing: IC16.png Voltage reading: IC16 pin1: 0.00v IC16 pin2: 0.88v IC16 pin3: 4.60v IC16 pin4: 5.02v IC16 pin5: 3.24v IC16 pin6: 2.38v IC16 pin7: 2.38v IC16 pin8: 5.02v I haven't yet compared ...
by aotta
Fri Jun 05, 2020 10:42 pm
Forum: 8-bit acorn hardware
Topic: Beeb micro doesn't reset at boot
Replies: 8
Views: 316

Beeb micro doesn't reset at boot

One of my Micro (issue 7 MB) stopped working with black screen and continuous beeb, i made some test and replaced ic33, ic16, ic32 and both VIAs, but no change. But the more strange it's that i get high value (about 4,4 v) in IC 16 pin 3 even without the 555 mounted! I removed the CPU, the IC31 and ...
by aotta
Mon May 18, 2020 8:44 am
Forum: 8-bit acorn hardware
Topic: IntegraB V2
Replies: 4
Views: 275

Re: IntegraB V2

Super! waiting for your progress, and in list for buying a new V2 to add to my Ken's IntegraB collection! :D =D>
by aotta
Sat May 16, 2020 12:47 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

I've now changed the palette to be generated mathematically from the way an NTSC decoder works rather than using preset values so the colours should be more technically correct and I've provided adjustments like an NTSC TV for tint (hue), saturation, contrast, brightness and gamma so you can now va...
by aotta
Fri May 15, 2020 2:31 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Ian, for more information, looking on an old thread in a french's forum, where talking about a replica of the RGB "Chat mauve" card for Apple II, i noticed the "different colours" issue was with the card too (end replica ones, even i didn't never get it working, but it's a different story..). If you...
by aotta
Thu May 14, 2020 8:26 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Yes, blu range is lighter and more accurate, the purple is still a bit reddish, but it's a great result: I might have the order of colours mixed up, can you run the integer Basic program about half way down this page: https://mrob.com/pub/xapple2/colors.html to compare with the real off screen phot...
by aotta
Tue May 12, 2020 9:01 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Thanks for testing, here's an update with some of the darker colours brightened up: NTSCArtifactV3.zip Yes, blu range is lighter and more accurate, the purple is still a bit reddish, but it's a great result: capture8.png Looks like the H offset in the geometry menu needs tweaking to centre the imag...
by aotta
Mon May 11, 2020 11:22 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 630

Re: Pi1MHz future supported devices

mph1708 wrote:
Sun May 10, 2020 11:20 pm

2) Emulation of Datacentre USB Drive 5.
The existing Pi1Mhz supports Datacentre Ramdiscs 0,1,2 & 3 and adding USB / FAT file access (Drive 5) would make this facility more useable.

Mike
My vote for this!
by aotta
Mon May 11, 2020 9:53 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

There is now a new option "NTSC Phase" which alters the phase of the NTSC decoder so there is no longer any need to adjust the delay value. The phase setting has values from 0-15 and there should be four consecutive values whic display the correct colours. Select one of the four values that shows t...
by aotta
Sun May 10, 2020 4:25 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

IanB wrote:
Sun May 10, 2020 4:07 pm

(I did say you would have to change to mono!)
of course, but i realized wich switch only after a while! :lol:
by aotta
Sun May 10, 2020 2:57 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

After several attempts, with fingers boiled on the microswitches, I thought of changing the internal switch (OS1 - Color / mono) of the Apple IIe PAL and setting it to mono: the color appeared clear and bright! apple1.png apple2.png And i had to use a different setting from yours to get a stable ima...
by aotta
Sun May 10, 2020 10:34 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

IanB wrote:
Sun May 10, 2020 2:22 am

Here's an experimental version with artifact colours:
ArtifactColours.zip
Ian, i got an error in unzipping the file, it seems corrupted, can you check it?
Thank you for sharing!
by aotta
Sat May 09, 2020 11:06 am
Forum: 8-bit acorn hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 160
Views: 8054

Re: New Raspberry Pi to 1MHz bus interface

i'm playing a bit with the 1Mhz interface and it's software, for testing its RAM support, but i can't find the (newbye) info i'm looking for.. i can use the RAM: disc with ramfs120 ROM, and i'd like to use a tool like the MMFS's IMTOD to copy SSD into RAM (or, better, like the *import command availa...
by aotta
Thu May 07, 2020 3:57 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

I'm currently working on NTSC artifact colours but when that's finished I'll be looking at the 8 bit YUV mode and the TI-99/4a. If it can be made to work that would also mean support for MSX-1 computers as they use the same video chip as well. Thank you for the info, and waiting for your progress i...
by aotta
Thu May 07, 2020 8:18 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Great news, thank you Dave and Ian for improving again this great project! And the wiki it's more and more detailed, now i can use it easily too! :lol: As suggestion, i think some more info about wiring of the different computers will be useful, too. For example, i'm testing a Sega SC-3000 getting t...
by aotta
Sun May 03, 2020 11:48 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

It works fine, with a little DAC adjustment, i've a dk'tronics's case for my rgbtohd cable: Thanks for confirming your 48K Spectrum works. Do you know what issue your board is? (It's been tried on Issue 2 and 3 so far). Tested on Issue 4B and 4S. Connected pin 6 to 5v from Speccy's sslot to avoid e...
by aotta
Fri May 01, 2020 1:49 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Thank Ian for the zxspectrum wiring, I have some spare joystick adapter I can use for cabling the analog boards, another line in my to do list! Here's the connections to the edge connector: Pin 1(GND) to Edge conn 14B (GND) Pin 2 (Sync) to Edge conn 16B (Y) Pin 3 (Blue/U) to Edge conn 18B (U) Pin 4...
by aotta
Wed Apr 29, 2020 4:30 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

I don't have an Apple II but I intend to get one someday. I haven't created a profile yet as I don't have any way of testing it. i hope you'll find one soon, i made some test with my IIe PAL and got only some awful gosthly images. and it need a new palette i suppose. Wozniak did some smart tricks f...
by aotta
Tue Apr 28, 2020 11:25 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

Thank Ian for the zxspectrum wiring, I have some spare joystick adapter I can use for cabling the analog boards, another line in my to do list!
And I read in a previous post that Apple II too can works, did you try it?
And, of course, my compliments for your showroom!
by aotta
Tue Apr 28, 2020 6:34 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

With a (big) help from IanB, i succesfully get my analog board working! Only issue with the default ZX81 profiles was some dirty pixeling in both side of the screen: capture0.png As suggested, i simply reduced the max horizontal capture size, and solved with this profile: ZX81.txt some others screen...
by aotta
Mon Apr 27, 2020 8:59 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

One more (and maybe stupid) question: the ZX81 YUV connection you explained above, does it need the logic board plugin and, in case, a specific Issue? Yes it needs the analog board plugged in and you connect the ZX81 signals to the analog board. Issue 2 or Issue 3 analog board will work. Today are ...
by aotta
Tue Apr 21, 2020 5:36 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

I discovered that Olivetti Prodest PC1 has a standard CGA video port, so i tested RGBtoHD 6bit with it, and working with some adjustement from standard CGA. That's the profile i used: Olivetti Prodest-PC1.txt Edit: forgot to mention i used same cable made for the C-128 80 columns mode And a couple o...
by aotta
Mon Apr 20, 2020 3:26 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

.... as I had one like that once. Only one? you're a pro! i damaged dozens of CPLDs while soldering and testing my RGBtoHD... now i've got two 3bit and two 6bit working ones, but i also ordered some analog boards "smd soldering service" from a chinese supplier: those little ICs are too difficult fo...
by aotta
Mon Apr 20, 2020 2:51 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1139
Views: 72569

Re: RGB to HDMI using a Pi Zero and a small CPLD

I had same issue too, but in my case was a bad soldering of CPLD pins 37, 38 or 39 that caused the switches crazily working.

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