Search found 7124 matches

by hoglet
Sat May 12, 2018 5:30 pm
Forum: hardware
Topic: Cheap SD/MMC Readers
Replies: 9
Views: 3160

Re: Cheap SD/MMC Readers

by hoglet
Fri May 11, 2018 10:57 pm
Forum: emulators
Topic: MAME: Click (and other large ROMs)
Replies: 42
Views: 1926

Re: MAME: Click (and other large ROMs)

I've emulated the AP5. With a Z80 attached it'll load CP/M but won't DIR a disc, tried with Peg400 and AP4. The problem is, the Z80 Client ROM contains some 6502 code that is uploaded to the host, and this hard codes the address of the tube data register at &FEE5. So you need to patch the client RO...
by hoglet
Fri May 11, 2018 4:55 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5185

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

See below the test pattern (bottom only) after switch on and then after a calibration (i.e. pushing the button). Not sure why it doesn't calibrate on switch on ? Is the second image after calibration? If so, then something is wrong as it has picked the worst possible sampling point! Can you grab th...
by hoglet
Fri May 11, 2018 3:11 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5185

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

Did you find until you changed the ground wire and added the resistor things were very poor or just didn't work or things slightly improved ? I wasn't able to get a consistently stable picture until I shortened the ground wire to about 5cm. The main clock (not SP_CLK) from the Pi to the CPLD is 96M...
by hoglet
Fri May 11, 2018 5:58 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5185

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

Hi Budgie, Great that you have made some progress with this. I had quite a few problems with getting a prototype working reliably. I found the earth between the Pi and the CPLD board needs to be very good. I also needed to add a resistor into sp_clk line to prevent ringing causing unwanted clock tra...
by hoglet
Thu May 10, 2018 5:47 am
Forum: acorn atom
Topic: Atom Cyborg Project
Replies: 4
Views: 372

Re: Atom Cyborg Project

Just a very quick request. The project is progressing and I will post an update very soon. I need a copy of the SYSTEM and BASIC ROMs. I took a copy of the SYSTEM ROM from hoglets VHDL code, and re-jigged the hex values into the Xilinx COE format. After some debugging, and thanks to the built in tr...
by hoglet
Thu May 10, 2018 5:41 am
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

The screen shots below show BeebEm (running on a Mac) with the program posted earlier by 'hoglet'. This has been formatted and hosted on a viewdata page. The was successfully transferred to Commstar but is stored as a text file not a basic file. I cannot remember how/if this can be converted. Any i...
by hoglet
Wed May 09, 2018 8:28 pm
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

Please don't delete the documents that have been uploaded. Who knows in the future when these may be the only remaining copies!
by hoglet
Wed May 09, 2018 7:00 am
Forum: emulators
Topic: 65816 Emulation
Replies: 1
Views: 190

Re: 65816 Emulation

There is some documentation here: http://www.zeridajh.org/hardware/reco6502/downloads/reco6502_122.zip 'Banking' (a 4-bit register), decodes as follows : bit 3 : ROM enable bit 2 : 65C816 banking enable bit 1 : banking enable for address window 2 (0x8000 through 0xBFFF) bit 0 : banking enable for ad...
by hoglet
Tue May 08, 2018 12:37 pm
Forum: software: new games
Topic: Atomic AGD
Replies: 58
Views: 3081

Re: Atomic AGD

hoglet wrote: Before releasing this, we need to add the start video/stop video to the windows GUI. I'm looking at that now.
That's now pushed to master as well.

Dave
by hoglet
Tue May 08, 2018 11:51 am
Forum: software: new games
Topic: Atomic AGD
Replies: 58
Views: 3081

Re: Atomic AGD

I've merged David's commits into master now.

Before releasing this, we need to add the start video/stop video to the windows GUI. I'm looking at that now.

Dave
by hoglet
Tue May 08, 2018 6:51 am
Forum: software: new games
Topic: Atomic AGD
Replies: 58
Views: 3081

Re: Atomic AGD

Dave, I've sent you a pull request for your Atomulator repository on GitHub. Great, I'll merge that this morning. I also recorded a video and uploaded it to YouTube but it seems that 512 x 384 is a video size that causes problems as, even after a few minutes, it's still not been processed. :lol: Co...
by hoglet
Mon May 07, 2018 9:12 pm
Forum: software: new games
Topic: Atomic AGD
Replies: 58
Views: 3081

Re: Atomic AGD

oss003 wrote: did you have a look at David's sources at Bitbucket for video capture?
Is it possible to do this in Atomulator?
Sorry Kees, not really had a chance to look at this yet.
by hoglet
Sat May 05, 2018 10:18 am
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

Hi John, In case you need another example to work with, here's a short example BASIC program: tele0.png And here's the resultant page from Commintel's "LOCAL TELESOFTWARE FORMATTER" opion: tele1.png The file being encoded was ASCII, rather than tokenized Basic. It looks to me to be the same CET form...
by hoglet
Sat May 05, 2018 9:30 am
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

The BASIC has been crunched (so don't try to paste it into BeebEm), but there is possibly still some useful info to be gained: Dave, is that due to line lengths or some other issue? ABE has a good 'UNPACK' command in the Utilities which may help. Yes, it's just down to the line lengths. If you LOAD...
by hoglet
Sat May 05, 2018 6:46 am
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

John, The telesoftware formatter is on the ADFS disk image posted in the Communitel thread: $.VIEWDATA.TSOFTER The BASIC has been crunched (so don't try to paste it into BeebEm), but there is possibly still some useful info to be gained: 20ONERRORPROCaa 30DIMba%&300,F%&3FF:T%=F%+144:ca=&FFEE:PROCda:...
by hoglet
Fri May 04, 2018 9:42 pm
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

This is interesting:
communitel.jpg
(Acorn User, October 1984, Page 60)

It contains a CET Telesoftware formatter.

Also a brochure:
CommuniTel - Micro Viewdata System.pdf
(204.27 KiB) Downloaded 17 times
Software appears to be available here:
http://www.stardot.org.uk/forums/viewto ... 86&p=73579

Dave
by hoglet
Fri May 04, 2018 9:01 pm
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

John, My reading of the checksum value is that it just the data bytes XOR'ed together. Here is a specific example from the header block on Fig. 1(c) ‖API.BAS‖LI‖Z102 The checksum should cover these characters: PI.BAS‖LI Looking at the individual character ASCII values: P = &50 I = &49 . = &2E B = &4...
by hoglet
Fri May 04, 2018 6:05 pm
Forum: software: other
Topic: Telesoftware Service
Replies: 34
Views: 1213

Re: Telesoftware Service

John, I'm always happy to help reverse-engineering something interesting and obscure! Is this the paper you were referring to? coates1982.pdf I assume you are talking about dial-up telesoftware, rather than broadcast telesoftware ( embedded in standard teletext pages )? It seems the Acorn Prestel Ad...
by hoglet
Thu May 03, 2018 6:58 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5185

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

Think I now have the pi code compiled and working. It comes up with INFO: RGB to HDMI booted INFO: Nominal clock = 384000000 Hz That seems OK - does it hang at that point? The next thing it does it to try to do some measurements of the VSYNC frequency, and I'm not sure what happens if there is no V...
by hoglet
Wed May 02, 2018 8:44 pm
Forum: emulators
Topic: MAME: Mouse
Replies: 20
Views: 1001

Re: MAME: Mouse

According to Jonathan's side, the direction signals of an AMX mouse feed in to D0 and D2. http://mdfs.net/Info/Comp/BBC/Mouse/ That's consistent with what B-Em is doing. I was using the M512 mouse as the example. Even if we get the same emulation code to work with both they still appear to be conne...
by hoglet
Wed May 02, 2018 8:03 pm
Forum: emulators
Topic: MAME: Mouse
Replies: 20
Views: 1001

Re: MAME: Mouse

The source code for the 6502.SYS driver is here: http://www.cowsarenotpurple.co.uk/bbccomputer/master512/m512tg-dabs/append-f.html#6502list It looks like it actively tries to detect a track ball vs a mouse, and this seems to change how it interprets the signals: 2B8F LDA userport ; Load VIA input re...
by hoglet
Wed May 02, 2018 7:48 pm
Forum: emulators
Topic: MAME: Mouse
Replies: 20
Views: 1001

Re: MAME: Mouse

According to Jonathan's side, the direction signals of an AMX mouse feed in to D0 and D2.
http://mdfs.net/Info/Comp/BBC/Mouse/

Dave
by hoglet
Wed May 02, 2018 7:15 pm
Forum: emulators
Topic: MAME: Mouse
Replies: 20
Views: 1001

Re: MAME: Mouse

I had problems a couple of years ago getting a quadrature trackball work with an M512/GEM.

See this post for a few more details:
http://www.stardot.org.uk/forums/viewto ... 66#p104466

May or may not be relevant to your current issue.

Dave
by hoglet
Mon Apr 30, 2018 9:19 pm
Forum: general
Topic: The Beeb's (first) 32-bit second processor on TV
Replies: 16
Views: 684

Re: The Beeb's (first) 32-bit second processor on TV

Ah good - something I'm happy to be wrong about! Thanks Dave. And even before the AP5 there was Acorn's Electron Tube Interface: product-82430.jpg (not sure this ever went into production) You might enjoy reading DaveH's memoirs: http://www.acornelectrontoday.com/dave-hitchins-presrh/4594087785 Dave
by hoglet
Mon Apr 30, 2018 8:05 pm
Forum: general
Topic: The Beeb's (first) 32-bit second processor on TV
Replies: 16
Views: 684

Re: The Beeb's (first) 32-bit second processor on TV

BigEd wrote:Am I right in thinking the Elk only got Tube capability in recent years?
The original AP5 (1986) supported the Tube.

Here's a review from Mike Cook:
https://archive.org/stream/ElectronUser ... 6/mode/1up

Dave
by hoglet
Mon Apr 30, 2018 3:28 pm
Forum: acorn atom
Topic: New Atom owner - trying to determine mods
Replies: 10
Views: 505

Re: New Atom owner - trying to determine mods

oss003 wrote: Can you upload a picture of the inside of your Atom with the mods because then it's easier to determine what's modded.
I'm guessing it is this one:
https://www.ebay.co.uk/itm/Acorn-Atom-h ... _cvip=true
by hoglet
Sat Apr 28, 2018 4:36 pm
Forum: acorn atom
Topic: Atom Colour board by unknown manufacturer
Replies: 12
Views: 454

Re: Atom Colour board by unknown manufacturer

I was going to start just by trying to draw up the schematic on paper over the next week.

It's quite a complex design, and colour composite video is not the best format to use on a modern monitor (sRGB is). So I'm probably not going to actually make one.

Dave
by hoglet
Sat Apr 28, 2018 12:42 pm
Forum: acorn atom
Topic: Atom Colour board by unknown manufacturer
Replies: 12
Views: 454

Re: Atom Colour board by unknown manufacturer

Those look excellent John, many thanks.
by hoglet
Sat Apr 28, 2018 8:38 am
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 52
Views: 1343

Re: BBC Micro Compendium by Jeremy Ruston

Could one of the mods please enable PMs for JeremyRuston?

Cheers,

Dave