Search found 611 matches

by IanB
Sat Jun 13, 2020 5:14 pm
Forum: 8-bit acorn hardware
Topic: Atom Video Output
Replies: 7
Views: 411

Re: Atom Video Output

Of course, I was forgetting the V-hold control was still commonplace unless you had a very high end TV. I had a 1989 Decca colour with no V-Hold (presumably it was automatic by then) that would happily display 60Hz, but a 1994 Bush that would refuse. It's a curiosity of the era we have now forgotte...
by IanB
Sat Jun 13, 2020 3:37 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

One other thing I noticed yesterday. I was running the HDMI via my upscaler which has HDMI in, and it is always reporting 60Hz input from the adapter despite the adapter menu being set to 1920x1080@50Hz How did I manage to get the board stuck at 60Hz? Cycling the menu between 50 and 60 Hz and reboo...
by IanB
Sat Jun 13, 2020 12:00 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

RM480Z anyone? (used the same settings as I calibrated on my Master). Another one to add to the supported list :) You can make a specific profile by copying and renaming the existing Master 128 profile in /profiles/xxx but change the Auto Switch option to off. Also if that image was meant to be cen...
by IanB
Mon Jun 08, 2020 8:28 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

Much appreciated Ian, will do -- would most likely otherwise have found this out the hard way and then reaslised what they were for :lol: I just noticed one other thing, You might have fitted P2 upside down on all four boards as I can see the 4 plastic 'pips' in the corners of each pin and they nor...
by IanB
Mon Jun 08, 2020 4:02 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

Update post ABUG: Analogue boards now built but not yet tested: Looking good, however you should fit P6 and P7 on the other side of the board then cut off their pins flush with the plastic (see wiki photo). RS actually stock the correct single pins now and I have linked them in the wiki but if you ...
by IanB
Mon Jun 08, 2020 3:45 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

JohnJones wrote:
Sun Jun 07, 2020 7:42 pm
You mentioned below that you had some of the 6-bit blank pcbs available. Do you still have some, and if you do how coiuld I get one? Many thanks.
Yes I still have plently of blank 6 bit pcbs. I've just sent you a PM with some info.
by IanB
Fri Jun 05, 2020 11:04 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

Nice to see another successful build =D> Bit confused at first why my monitor didn't like the initial boot screen, but the CPLD programmed fine and after that the menu sorted itself out. The screen offset in CPLD recovery mode is a bug that was introduced in one of the last changes before release. I...
by IanB
Fri Jun 05, 2020 2:52 pm
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 61
Views: 3503

Re: Personal Computer World scans!

February 1984 is missing pages 305 to 308 and 323 and 324 May 1983 is missing pages 221 to 224 Looks like there was a problem with multiple sheets going through the scanner at once. I have May 83 & May 84 but not Jan or Feb 84 or. I can do the missing pages on a flat bed scanner but they will need ...
by IanB
Fri Jun 05, 2020 2:20 am
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 61
Views: 3503

Re: Personal Computer World scans!

It's fab for old electronics magazines, like: - Electronics Today International - Everyday Electronics - Practical Electronics - Elektor - Wireless World - Electronics - The Maplin Magazine Thanks for those links, I used to get all of those magazines at one time or another in the 80s although it wa...
by IanB
Fri Jun 05, 2020 12:03 am
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 61
Views: 3503

Re: Personal Computer World scans!

Do we have anyone who could scan them Ian? I scanned them a few hours ago and Lurkio has already added them to the collection. I cut the perfect binding spines off using an A3 guillotine so I could use a sheet fed scanner and it didn't take very long although doing it that way does destroy them. BT...
by IanB
Thu Jun 04, 2020 6:41 pm
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 61
Views: 3503

Re: Personal Computer World scans!

Btw, another anomaly has been pointed out to me: the April 1983 issue is only 22 pages long. @iainjh: any idea why? EDIT: All the issues that I was sent have now been uploaded to Archive.org. Thanks to all concerned for these. I have a few of the missing ones: 1983-04 (full version) 1983-11 1983-12
by IanB
Wed Jun 03, 2020 8:40 pm
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 61
Views: 3503

Re: Personal Computer World scans!

iainjh wrote:
Wed May 27, 2020 4:25 pm
dont ask yet which are on the DVD's, as still copying.. 22gb+ of files.
Have you got a final list of any missing ones and where the collection ends?
by IanB
Sat May 30, 2020 5:17 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz Software
Replies: 39
Views: 1838

Re: Pi1MHz Software

dp11 wrote:
Sat May 30, 2020 1:32 pm
This has enabled me to add a frame buffer.
Neat =D>
I guess these were some of the "few steps required" you mentioned in the other thread before Prisma 3 support might become possible.
by IanB
Mon May 25, 2020 9:14 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

anightin wrote:
Mon May 25, 2020 8:28 pm
Hope they work!
Good luck!

As people are starting to build the latest issue 3 boards, I've just updated the BOM in the wiki to reflect the differences between the six bit issue 2 and 6/8 bit issue 3 boards

https://github.com/hoglet67/RGBtoHDMI/w ... t-Board%29
by IanB
Mon May 25, 2020 3:54 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

So I guess your "new" CPLD wasn't actually blank, and was driving pins 39/40. Where did you buy them from? I bought the cpld from AliExpress. It came sealed in a tray and unless they cleaned it up very well it looked brand new to me. However as always you take your chances with items shipped from C...
by IanB
Mon May 25, 2020 2:21 am
Forum: 8-bit acorn hardware
Topic: XC9500XL phaseout
Replies: 27
Views: 1693

Re: XC9500XL phaseout

hoglet wrote:
Mon May 04, 2020 3:54 pm
Farnell stil has stocks of the faster -7 part:
Farnell prices for the XC9572XL -10 and -7 have just quadrupled. The -10 is now £14.736 inc VAT!
Meanwhile Mouser and Digikey are back to normal pricing. (£3.58 inc VAT)
by IanB
Sun May 24, 2020 11:05 pm
Forum: acorn atom and acorn system series
Topic: Acorn System software
Replies: 5
Views: 1233

Re: Acorn System software

Did this ROM get imaged at any point? I'm now looking for a DOS/NOS System 5 ROM that initialises the 80x25 VDU card as the ROM I currently have is 40x25 only. I posted it here: https://stardot.org.uk/forums/viewtopic.php?f=3&t=11606&p=145594#p145594 Do you have a link to your 40x25 version as I ha...
by IanB
Sun May 24, 2020 4:57 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

Even the SMD components? I'm fine with throughhole, but I'm not sure my skills are up to soldering the smallest SMD components with a soldering iron. Same here, ordinary solder, a liquid flux painted on the pads and legs of ICs and desoldering braid to mop up any bridges Here's a tutorial by Ben He...
by IanB
Sat May 23, 2020 1:26 am
Forum: other vintage hardware, software and languages
Topic: turning on CGA / EGA / VGA '87 monitors?
Replies: 7
Views: 663

Re: turning on CGA / EGA / VGA '87 monitors?

sure I have a VGA converter box to HDMI, up the loft, so could have these to normal new TV.... RGBtoHDMI supports CGA EGA and MDA from PC See thread & wiki: https://stardot.org.uk/forums/viewtopic.php?f=3&t=14430 https://github.com/hoglet67/RGBtoHDMI/wiki The gallery here has some sample screencaps...
by IanB
Thu May 21, 2020 5:40 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

danielj wrote:
Thu May 21, 2020 1:08 pm
Boing. @IanB - do you still have any 6 bit boards knocking around?
Yes, and I also have some analog boards and 3 bit TTL buffer boards.
by IanB
Mon May 18, 2020 7:48 pm
Forum: 8-bit acorn hardware
Topic: ROMS - lots and lots
Replies: 39
Views: 2082

Re: ROMS - lots and lots

Or this... image.jpgimage.jpg I have a few of those, it's the "butterfly" board that contained OS 1.00 on two 2764 Eproms and was supplied by Acorn with the 8271/DFS 0.90 disc upgrade kit before OS 1.20 was available in ROM. At that time, 27128s were either not available or really expensive and you...
by IanB
Sun May 17, 2020 2:03 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

I can but I honestly prefer avoiding it! It's only one 44 pin chip and 10 capacitors/resistors. All the rest are through hole. What does the analog front end mentioned on the wiki actually do? It's a set of 8 voltage level comparators and an 8 output DAC to set the reference voltage levels. Two com...
by IanB
Fri May 15, 2020 11:20 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

This looks really good, are you selling made up devices or kits anywhere? I was planning on getting a small batch made up in china but the current situation has put that on hold for the moment. I do have some 6 bit blank pcbs if you can do surface mount soldering and want to build one. Parts list e...
by IanB
Fri May 15, 2020 11:07 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

There, you could find a picture i got to my Apple IIC with RGB adapter (scart), that show the colours a bit different to original IIe TV output, and to the ones you made with RGBtoHD! Thanks for the link. I've now changed the palette to be generated mathematically from the way an NTSC decoder works...
by IanB
Thu May 14, 2020 12:00 am
Forum: 8-bit acorn hardware
Topic: Pi based Prisma 3 emulation connected via 1Mhz bus
Replies: 77
Views: 5786

Re: Pi based Prisma 3 emulation connected via 1Mhz bus

The background scrolling in CIRCUS2 is good, using SDA. But with this implemented the loading backgrounds screen in HAFOC is now shifted a few pixels to the left, so missing the left hand side of the L in Loading. I've also looked at implementing the Delay Trim, can you suggest a good test case for...
by IanB
Wed May 13, 2020 10:53 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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 IanB
Tue May 12, 2020 1:23 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

Checked new version and played with NTSC Phase, it works, with colours a bit darker but nearer to normal output: Thanks for testing, here's an update with some of the darker colours brightened up: NTSCArtifactV3.zip I'll made more test with Phase's tuning, and will report if some improvements. Look...
by IanB
Mon May 11, 2020 8:11 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98854

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

I noticed anyway that text chars are clearer on composite colour output than in RGBtoHD... but it's a great result! I've made some improvements to the mono NTSC artifacting code which should increase the quality of text: Old version: capture34.png New version: capture31.png There is now a new optio...
by IanB
Mon May 11, 2020 5:37 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 950

Re: Pi1MHz future supported devices

I think Prisma 3 might be possible , there are a few step required before this is possible. I'm working on these steps in the background. I will need help ! Sure, I can help. So, is that the Inca Jones, Snooker and Racing game that you've posted screen captures of? They look awesome. Inca Jones and...

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