forum.defence-force.org

The thing is that my 27C512 didn't pass the empty test in my programmer. It did however write the binary in, and while verify fails, looking at the file contents visually show that the binary should be in there in its entirety. I don't know if you or the chip-programmer are to blame there ;) If you...

I found that I could erase a UVPROM with an 18w UVC germicidal tube in less than 1 minute. If anyone needs to. Erase or nuke? Did you mount the tube inside the chip ;) ? "The recommended erasure procedure is exposure to UV light at 253.7 nm of at least 15 Ws/cm2, usually achieved in 20 to 30 minute...

t it seems that the Rambling in the Rom collection isn't complete. I'll complete if i've some missing issues. The Rambling-in-Rom is as complete as it gets (#C000-#F263 ended in OUM 143-144), the remaining ones were not published (hence the notes in the .txt files). Where R-i-t-R did not actually g...

OK those are coarse vertical bars (character block sized), and I didn't put any of *that* in the test ROM :) I suspect that if you've got a (known) working Diag Rom, and there's no sign that it got into the RAM test, it could have failed at the first hurdle (it tests a couple of low/zero page bytes ...

It’s just stuck on showing the thin vertical bars. Vertical like | | | or the "other vertical" like -- ---- ---- I've had that problem before with reports! :) If it's coarse (character block sized) bars, like a usual Oric startup, these are usually horizontal. Vertical coarse bars I know nothing ab...

None of this is hard but you have to have seen the rewards of the effort required to use it effectively. This is true. If it's your project, and you don't use any kind of revision control at all, then it's only your own time you waste when trying to work out why something stopped working, where to ...

Mike, if you've scanned the two books any chance of a copy? It'd save me a job! I could concentrate on scanning the remaining articles from OUM. No problem, will PM you when they're fully uploaded somewhere (currently running). EDIT: Temporarily at http://oric.signal11.org.uk/files/pub/magazines/ f...

The two books you mention -- I think you're referring to "The Naked Oric" 1 (C000-CFFF, 63 pgs) and 2 (D000-DFFF, 74 pgs) which I have on paper (in English, and have already scanned). That's only half the story then ... but the format of combining the routines from 1.0/1.1 side-by-side and the detai...

(as Advanced User Guide from Leycester Whewll that i prefer, it's more detailed) The Bob Maunder one (Oric-1 Companion?) has the 1.0 ROM "disassembled" but IIRC there are no comments, and I believe it misses some of the nuance/detail e.g. routines with entry points half way through an instruction a...

Somehow the NMI pin is always low Now if I can find a replacement NMI button, my ORIC is good as new. There is no part number shown in the service manual for this switch, but any momentary action normally-open switch would do here. It's a bonus if it fits directly into the PCB holes, but if not, th...

So the debug ROM runs but it FAILS the CASS O/Rly/Spkr. The test does not progress anymore from there. Is it hung ? I can hear a pulsing tone with the loopback connector. Then press NMI to move on :) (It really should say "Press NMI to continue" on screen ...) From my comments in source "Timeout 20...

I suspect I can hack the ROM for NTSC. There must be two places to change. One for TEXT and one for HIRES. Which ROM? The Oric/Atmos one for general use or the diag ROM? I didn't do a 60Hz version of the Diag ROM as I have no 60Hz-capable monitor here, and as you probably realise, the 60Hz thing in...

I also suspect that converter may be looking at the signal from Oric and disputing that it is a valid video signal :) For a TV set/monitor of the era, close enough was good enough. All these modern smart devices are more likely to pick holes in the signal! Is there any configuring possible of the co...

All seems to be working fine so far, many thanks to Dbug for rescuing the forum!

the real ones have a 'blister' over the ICs. (I'm not sure if that is just protective or has some other use?) I wonder if you'd be able to read a 3" disk? maybe do a disassembly? I could post something like that if you'd like to have a look. I have yet to test whether the BD disks could work on oth...