Search found 221 matches

by mikeb
Thu Jul 09, 2020 5:08 pm
Forum: Technical questions
Topic: Help with two Orics
Replies: 100
Views: 9342

Re: Help with two Orics

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 ...
by mikeb
Wed Jul 08, 2020 6:24 pm
Forum: Technical questions
Topic: Help with two Orics
Replies: 100
Views: 9342

Re: Help with two Orics

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...
by mikeb
Wed Jul 08, 2020 6:11 pm
Forum: General Discussion
Topic: Source code repository discussion
Replies: 25
Views: 771

Re: Source code repository discussion

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 ...
by mikeb
Tue Jul 07, 2020 4:49 pm
Forum: 6502 assembly coding
Topic: Complete list of Oric Atmos adreeses
Replies: 24
Views: 899

Re: Complete list of Oric Atmos adreeses

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...
by mikeb
Mon Jul 06, 2020 4:49 pm
Forum: 6502 assembly coding
Topic: Complete list of Oric Atmos adreeses
Replies: 24
Views: 899

Re: Complete list of Oric Atmos adreeses

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...
by mikeb
Sun Jul 05, 2020 5:50 pm
Forum: 6502 assembly coding
Topic: Complete list of Oric Atmos adreeses
Replies: 24
Views: 899

Re: Complete list of Oric Atmos adreeses

(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...
by mikeb
Sat Jul 04, 2020 4:08 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 1428

Re: Need help fixing Oric 1

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...
by mikeb
Fri Jul 03, 2020 4:44 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 1428

Re: Need help fixing Oric 1

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...
by mikeb
Thu Jul 02, 2020 3:51 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 1428

Re: Need help fixing Oric 1

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...
by mikeb
Tue Jun 30, 2020 5:17 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 1428

Re: Need help fixing Oric 1

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...
by mikeb
Sun Jun 28, 2020 9:02 pm
Forum: General Discussion
Topic: Changed of hosting strategy
Replies: 12
Views: 3545

Re: Changed of hosting strategy

All seems to be working fine so far, many thanks to Dbug for rescuing the forum!
by mikeb
Sun Jun 28, 2020 8:58 pm
Forum: Operating systems, utilities and other serious software
Topic: Is BD-DOS lost to time?
Replies: 56
Views: 8029

Re: Is BD-DOS lost to time?

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...
by mikeb
Sat Jun 20, 2020 4:33 pm
Forum: Hardware hacks and extensions
Topic: Erebus.
Replies: 4
Views: 198

Re: Erebus.

I like that hack :) It's even better than the diode thing, as it's a proper TTL drive output, either drive the line low, or leave it to float (open). As noted in another posting, this sort of thing needs to be done on any other thing on the IO control line though (because a.n.other device may drive ...
by mikeb
Wed Jun 17, 2020 5:29 pm
Forum: Operating systems, utilities and other serious software
Topic: Is BD-DOS lost to time?
Replies: 56
Views: 8029

Re: Is BD-DOS lost to time?

From Personal Computer News (PCN) March 10 1984 :- A review of the ITL Kathmill "hybrid" cable, describing it as a chips-on-ceramic-baked-in-resin (YUM!) device, and also mentioning it has its own ULA on board which implements the disk controller (so not a standard WD part, but a compatible emulatio...
by mikeb
Mon Jun 15, 2020 6:12 pm
Forum: Hardware hacks and extensions
Topic: Protek joystick interface diagram ?
Replies: 27
Views: 1030

Re: Protek joystick interface diagram ?

Stupid question: would it not be feasible to merge the ROM's? Not a stupid question at all! It would be possible to put the contents of more than one ROM into a larger EPROM -- that's been done for things like mods where people have put an Oric 1.0 ROM, an Atmos 1.1 ROM, diagnostic software, and so...