Search found 532 matches

by anightin
Sat Aug 01, 2020 9:40 am
Forum: for sale / freebies
Topic: Acorn ATOM For Sale
Replies: 0
Views: 90

Acorn ATOM For Sale

Dear All, One can never have too many ATOMs so they say :) However I now have 3 and now need to make space for my Jupiter Ace build :( YARRB2 Noisekiller New Crystals New Electrolytic Caps New PSU -- 5v Switch Mode HDMI Adapter + HDMI Cable AtoMMC2 Atomic Theory and Practice Manual Practical Program...
by anightin
Thu Jul 30, 2020 7:06 pm
Forum: 8-bit acorn hardware
Topic: MiniPro vs XGecuPro and 2532 EPROMS
Replies: 0
Views: 101

MiniPro vs XGecuPro and 2532 EPROMS

Dear All, This thread started in the hardware help section prior to the 1st Aug ABUG: https://stardot.org.uk/forums/viewtopic.php?f=25&t=19976&start=60#p280843 Thanks to @JudgeBeeb I now have a couple of known good TMS2532JL EPROMs to play with. I started by erasing them and programming them using m...
by anightin
Mon Jul 27, 2020 2:29 pm
Forum: acorn & bbc micro user group (abug) events
Topic: All-day 'Virtual' Acorn session #6, Saturday 1st August 2020, 9am - 11pm [NOW FULL!]
Replies: 97
Views: 2934

Re: All-day 'Virtual' Acorn session #6, Saturday 1st August 2020, 9am - 11pm [NOW FULL!]

Things I need help/feedback on: 1) Is there anything obvious in my implementation that I've missed that would stop it from working? 2) Could it be that the modern TL866II with latest firmware and software be blocking my external voltage inputs by way of detection? 3) Would anyone be able to lend me...
by anightin
Mon Jul 27, 2020 11:00 am
Forum: acorn & bbc micro user group (abug) events
Topic: All-day 'Virtual' Acorn session #6, Saturday 1st August 2020, 9am - 11pm [NOW FULL!]
Replies: 97
Views: 2934

Re: All-day 'Virtual' Acorn session #6, Saturday 1st August 2020, 9am - 11pm [NOW FULL!]

<no assistance requested as of yet - please post in this thread if there is something you'd like the A-Team to help you with!> Dear All, Since you ask :D I have built an external voltage supply and a pin remapper for adapting 2532, 2716 and 2732 EPROMs for the TL866 programmer based on designs orgi...
by anightin
Sat Jul 25, 2020 9:47 am
Forum: 32-bit acorn hardware
Topic: A3020 damaged in transit - replacement transformer?
Replies: 12
Views: 375

Re: A3020 damaged in transit - replacement transformer?

Unless you want to go down the modern route, I've just found this in my spares box:
IMG_7449.jpeg
IMG_7450.jpeg
PM me if interested and we'll sort something out about getting it to you :)

I don't have a spare fuse holder though unfortunately

Regards

Andy
by anightin
Wed Jul 22, 2020 10:44 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Thank you both for confirming..I'll made further tests I tried the connection to the standard video port and you are right, no obvious changes regardless of switch position or jumper. It is only the jack output that seems to be affected by the new tweaks which makes sense I guess -- this is where I...
by anightin
Wed Jul 22, 2020 10:14 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Thank you both for confirming..I'll made further tests I tried the connection to the standard video port and you are right, no obvious changes regardless of switch position or jumper. It is only the jack output that seems to be affected by the new tweaks which makes sense I guess -- this is where I...
by anightin
Wed Jul 22, 2020 8:18 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Yup, fantastic job by Ian and C0pperdragon. With no FPGA board link or switch set I get this instead of the standard palette: IMG_7430.jpeg Did you reprogram your CPLD with the beta3 RGB2HDMI code from Ian? No, i've not yet tested the RGBtoHD since i've no cable for it, but it seemed strange to me ...
by anightin
Wed Jul 22, 2020 7:20 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Back to the C64 today and tried out the new C0pperdragon firmware and the Beta3 release. Once I'd read Ian's documentation, the new palette was there without the need for any programming this time :) Good result! i've just installed my C0pperdragon and flashed new 2.7 firwmare (release, not beta2) ...
by anightin
Wed Jul 22, 2020 4:56 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

No visible effect that I can see I think what's happening here is that RGBtoHDMI is not detecting the video as mode 7 (i.e. interlaced) and is thus failing to engage the approriate capture code and deinterlacing. That's why the characters look ugly and jagged, very unlike what "mode 7" on the Beeb ...
by anightin
Wed Jul 22, 2020 2:44 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Back to the C64 today and tried out the new C0pperdragon firmware and the Beta3 release. Once I'd read Ian's documentation, the new palette was there without the need for any programming this time :)

IMG_7431.jpeg
IMG_7432.jpeg
by anightin
Tue Jul 21, 2020 1:00 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

hoglet wrote:
Tue Jul 21, 2020 12:32 pm
What does it look like with interlace enabled?
No visible effect that I can see

Update:


Here is the profile I ended up with for future reference
System_40x25VDU.txt
(139 Bytes) Downloaded 3 times
by anightin
Tue Jul 21, 2020 12:18 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

If after following Ian's advice you still have proiblems, it might be worth looking at the 6MHz clock. Looking at the System 40x25 schematic, the means for generating the 6MHz clock is very different to the Beeb. It uses IC3 as oscillator, capacitively coupled to the 1MHz clock to keep it in phase:...
by anightin
Mon Jul 20, 2020 10:49 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Despite the occasional offset issue I get a rock solid picture for the first few minutes and then some sparkly pixels that get gradually worse the longer the system is left running. I am wondering if the heatsink I have on my VIC II is sufficient enough. I do plan to get another later revision VICI...
by anightin
Mon Jul 20, 2020 9:34 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

I had a play with the System 3 tonight and the 40x25 VDU card. I used Teletext mode as a starting point but am struggling to tune it to get rid of twinkling pixels on the left and right of each character. It's almost there but not quite. Any hint on what I can tweak would be much appreciated :? IMG_...
by anightin
Mon Jul 20, 2020 9:27 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

Yup worked first time. I did notice it can start up with a wierd negative screen offset or some sparkly pixels but powering off the C64 and on again fixes this. Seems to be fine once it’s settled. I'm getting the occasional picture shift on power up as well which power cycling fixes. It's a problem...
by anightin
Mon Jul 20, 2020 6:53 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

And finally the RGBtoHDMI adapter after a bit of palette juggling thanks to the excellent instructions from Ian: What a fantastically crisp display :D That was quick, well done! Yup worked first time. I did notice it can start up with a wierd negative screen offset or some sparkly pixels but poweri...
by anightin
Mon Jul 20, 2020 8:26 am
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 43
Views: 1599

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

(Replied to the above post in the original POST box thread -- I think I might need to make a support thread just for this board, as it's getting confusing having the discussion for all the variants all in one place...) ... and replied in the other thread on capturing a trace from my RISC PC 700 tha...
by anightin
Mon Jul 20, 2020 12:02 am
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

I've just added support for some more machines although a couple of them needed some mods to get working: 1. Commodore 64!! This one required some serious mods: First fit c0pperdragons YUV adapter https://github.com/c0pperdragon/C64-Video-Enhancement Then reprogram the YUV output of the adapter usi...
by anightin
Sun Jul 19, 2020 3:57 pm
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

If you can, I'd put the scope probe IC grabbers on, then clip them onto the RISC PC's test connector. Mate the POST Box on top, it should (just about) grab. You can pick up a ground from the POST header too, or from the metal back panel. The POST header is preferable as it keeps the electrical sign...
by anightin
Thu Jul 16, 2020 10:33 am
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

Sure, I should be able to capture something to look at but probably not until the weekend. Should be interesting, there is definitely a difference between my two machines running the same CPU cards between them. If you can, I'd put the scope probe IC grabbers on, then clip them onto the RISC PC's t...
by anightin
Wed Jul 15, 2020 8:55 pm
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

Do you have a scope or logic analyzer handy? It would be interesting to see a trace of testreq + testack from either... a scope trace would tell us if testreq is out of spec or something odd is going on with the testack resistor, and either would show if the pulse rate on testreq is near the edge o...
by anightin
Wed Jul 15, 2020 10:32 am
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

Thanks for the hints Phil, will add this to the todo list, it would be interesting to debug.

Ironic if the only thing wrong with the machine is the POST port :lol:

I suspect there is more lurking for me though :?
by anightin
Tue Jul 14, 2020 10:33 am
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 43
Views: 1599

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

I think I might need to make a support thread just for this board, as it's getting confusing having the discussion for all the variants all in one place... Great idea Phil, as I replied to that reply with more testing results :lol: https://stardot.org.uk/forums/viewtopic.php?f=16&t=17478&start=90#p...
by anightin
Mon Jul 13, 2020 7:26 pm
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

I have however posted earlier in this thread ... https://stardot.org.uk/forums/viewtopic.php?f=8&t=19815&start=30#p278372 ...that the MEMC test script doesn't result in any updates on the display that I have noticed. I was hoping that the video might get initialised by it etc but my RISC-PC 700 jus...
by anightin
Mon Jul 13, 2020 6:56 pm
Forum: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1181
Views: 80148

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

IanB wrote:
Mon Jul 13, 2020 6:46 pm
I've just added support for some more machines although a couple of them needed some mods to get working:
Excellent stuff =D>

C64 is next on my list then System 3 40 column card.

Screen output looks brilliant!
by anightin
Mon Jul 13, 2020 6:06 pm
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

Hmm. I have a StrongARM RPC600, although with RO 4.02, so I’ll probably need to swap the roms to get the self-test code. Andy, have you tried the USB POST box with your RPC700? If not, I’ll see about scoping mine up to see if it works... Hi Phil, Yes I've tried USB Post Box and initial tests connec...
by anightin
Mon Jul 13, 2020 5:01 pm
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 125
Views: 6548

Re: Acorn "POST box" display adaptor (0086,804)

... More likely the 15us reset delay is too slow for a StrongARM. The quickest way to get that machine running selftest would be to swap the ARM610 into it. That'd also tell you whether it's a timing problem (which means the comms reset delay needs to be shortened) or a motherboard fault. Thanks Ph...

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