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I've pushed this change back to github: https://github.com/hoglet67/AtomBusMon/commit/9c6960cc Hi Dave, Can confirm this is MUCH more usable, boots fine on the Dragon 64 (it didn't boot at all before), and is also for the first time working with a DragonMMC card plugged in. Now this should make it ...

Hi Phill, Did you ever figure out what was barfing the 6809E target? I've spend some more time on this and I think I understand the problem now on the Dragon 32. It seems the E clock is a bit ropey as seen by the FPGA: I The falling E clock edge bounces around for a while, and about 70ns it's just ...

Hi Dave,

Did you ever figure out what was barfing the 6809E target?

Cheers.

Phill.

roland wrote: ↑

Thu Sep 12, 2019 9:06 am

Hi Phill,

The MDCR is directly connected to the Atom's VIA. See: http://www.acornatom.nl/atom_nieuws/198 ... 852053.gif

Ahh yes that makes sense, I always forget that the VIA's I/O lines also go to the bus connector.

Cheers.

Phill.

Ah yes,

Lesley will be around for this one, she'll be going off doing her own thing during the day, so won't need 'table space' But will be joining us for the meal on Friday evening....

Cheers.

Phill.

You wouldn’t happen to have any of the devices that plug onto Atom motherboards to provide video output? You had a quick look at my two Atoms a few ABUGs back and I made a mental note at the time that I needed to get hold of some! You mean connectors for the composite out (PL4), if so yeah could pr...

With less than a week to go, anything anyone wants me to bring beyond :

Normal soldering equipment & tools.
Eprom / AVR / PIC / Xilinx programmers.
Shuttle PC for reading floppies.
Dragon + PSU (for looking at sbadger's Dragon).
Normal assortment of Beeb / Atom stuff.

Cheers.

Phill.

Hi Phill, like Colin & Roland said I have a working MDCR player connected to one of my Atoms... :D https://www.youtube.com/watch?v=ocl1SbwkfLY Ahh that's the one I remembered seeing. Looks like the interface card on the Atom is built into the Drive unit (in the same way as AtomDOS and the floppy). ...

Hi all,

Do I remember one of the Atom users on here posting a video of an Atom connected to a mini-tape drive, big square black fronted thing. I think the same unit was used sold on other machines as the IKON tape drive.

Cheers.

Phill.

As far as I know those dates should be good for me.

Cheers

Phill.

roland wrote: ↑

Tue Aug 27, 2019 12:37 pm

(that's another law in nature: the survival of the fittest).

But most people don't interpret that correctly in the evolutionary case at least "fittest" means best adapted which may not be "bigest/strongest/fastest" etc

Cheers.

Phill.

Be interesting to know how the data is passed back and fourth to the STM side, does it do something like set track and sector to $FF and then pass a fake sector over with a pre-determined format..... If there's already a protocol for doing this used by other systems, then Acorn systems should try an...

Right inbox at 11% full but message still on hold.....

Don't worry I fixed it.

Cheers.

Phill.

Right cleared out inbox.

Cheers guys.

Phill.

Hi all, Had a notification of a PM in my email, clicked on link, and it took me to a page for the PM that said.... "Information You are not authorised to read private messages that are on hold." Well in that case why the notification, if I can't read the PM yet perhaps the forum should not be notify...

Phill, thanks for that info. I had considered that but read somewhere someone had a problem doing that. But if it worked out OK for you then I'll do just that. Don't see any level problems the 3V CPU driving 5v LS ? Yep seemed to work OK for me in the System's drive chain....actually the way I desi...

Jason, Dunno if you have thought of this, but for the FF addon board id did for the System card I used a 74LS07 open collector chip, that way you don't need the FETS and their components, might make it easier to build, and give you a little more room if you can get LS07s in surface mont versions. Le...

Please put me down also as a "no kitter" fri-sun I'm not even sure I need any table space ... are "no kitters" not, essentially, "punters" :D Well sort of**, we generally get access to the museum 'after hours',asically until either we or (museum) Jason wants to go home, which normal museum visitors...

Dunno if it's just me but with the black boarder on top, right and bottom sides of that scan it almost looks like it may have been taken from a hardback book printing. Doesn't look like Dr Who monthly, having said that I stopped getting it in the late 80s so may have changed by 1991. Cheers. Phill.

Hi all, Cap is a 16V, which is what it was replacing so assumed that would be OK, waveform on it is a solid -4.8V - -4.9V (with a 5V input). If I remove the cap pin 5 is toggling, but that's kind of what you'd expect. Only thing being driven by that cap is the other 7660, it also goes to a jumper pa...

Hi all, Sorry I seem to be asking more general electronics questions than Acorn related ones lately....... I've tracked down the LCD problem in the Huskys and it is indeed warn out capacitors (well actually in one case incorrectly polarized caps as the silk screen on the PCB was wrong!). The caps ar...

Windows doesn't install telnet by default, hasn't done since about Windows 7. You can re-add it fairly easily. I normally use netcat for the sort of thing telnet would be useful for. Terminal emulation was the bit I was missing. It doesn't? Was on this Windows 10 install......mind that is the "educ...

Neat idea. I haven't got a suitable telnet client installed, got any recommendations (I'm on Windows) I believe most versions of Windows still have a command line telnet client you can use from a CMD window. Likewise for Linux and Macos. Though this doesn't really have any terminal emulation, it's ...

I have two clone programmers, both of which work fine under Windows 7/64 (and both worked uner XP). One I got ages ago from Kanda : https://www.kanda.com and was at the time about £100, which was still less than half of what an official Xilinx one was. They currently seem to be doing (judging by the...

I can bring my scanner I live just around the corner, if need be. Also the museum does software preservation, I believe. If they are rare I'm sure Jason Fitzpatrick from the museum would be interested. They have the equipment upstairs, I believe. You'll have to ask CCfCH though. Read in one thread ...

Some LCD displays need a negative reference voltage for the contrast control circuit. It's worthwhile checking this. If a DC/DC converter is used, it could be a failed capacitor. As these are battery powered handheld machines**, yep if they need a -ve voltage there will be a DC/DC converter there :...

danielj wrote: ↑

Fri Aug 09, 2019 10:32 am

Feels a bit capacitory to me? Just a quick google after that suggests that capacitors are the issue in old watches with failing LCDs...

Indeed that's what I thought....maybe time to invest in an LCR meter that will measure ESR.

Cheers.

Phill.

@Phill, Many thanks !! This will give me a nice headstart. XC9572 is not an issue as it is there in a 44pin (SMD) version so not too much of a footprint. Indeed and the nice thing is where the different members of the family are in the same packages they are generally pinout compatible, meaning if ...

Ok, having tried things out in Webpack, something like the following...... module decoder( input [7:0] D, // Data bus from CPU (Z80???) input [2:0] AL, // Address bus low bits input [15:14] AH, // Address bus high bits input nRESET, // System reset input nMREQ, // Memory request input nCFGCS, // Con...

Taking a quick look at your schematic..... You have two latches that are 4x4, one of which latches d0..d3, the other d4..d7, so these can be treated as a 4x8. This means you are going to need 32 bits of latches so, at a guess I'd say you'd be pushed to fit this into a 9536, as there's only one flipf...