Search found 270 matches

by mikeb
Thu Jan 14, 2021 6:19 pm
Forum: General Discussion
Topic: FebrORIC?
Replies: 8
Views: 633

Re: FebrORIC?

mmu_man wrote:
Wed Jan 13, 2021 5:55 pm
Hmm, riiiight… not sure the pun is as catchy though.
OK, let's compromise! Do it through May and June, call it "Mayjoric" :)
by mikeb
Fri Dec 25, 2020 4:58 pm
Forum: 6502 assembly coding
Topic: Oric Atmos ROM 1.1b Disassembly - browsable listing by [raxiss]
Replies: 3
Views: 1187

Re: Oric Atmos ROM 1.1b Disassembly - browsable listing by [raxiss]

Excellent resource, and what a Xmas gift! Already saved for posterity! :) Note that at #E43A ... "trigonometric function data" ... is it time to acknowledge the easter egg? perkin (~)> echo "MICROSOFT" | rev | hexdump -C 00000000 54 46 4f 53 4f 52 43 49 4d # Hi bits, hi bits, other than that it fits...
by mikeb
Thu Dec 10, 2020 4:38 pm
Forum: Hardware hacks and extensions
Topic: IJK-egopad the joypad for Oric by [raxiss]
Replies: 32
Views: 4014

Re: IJK-egopad the joypad for Oric by [raxiss]

Hi all Why don't you have launched some sells with paypal friends process, to reduce costs Further to the answer given by @iss, using Paypal "Send payment to my friend" to pay for goods and services is a red-flag for lots of people, it is the hallmark of scammers and conmen who have no intent to pr...
by mikeb
Tue Dec 01, 2020 3:49 pm
Forum: Hardware hacks and extensions
Topic: Philips D6260 K7 deck bulk repair
Replies: 21
Views: 1668

Re: Philips D6260 K7 deck bulk repair

mmu_man wrote:
Mon Nov 30, 2020 11:25 pm
Not so often, and if I do I'll use an uppercase WE.
I usually see this slashed as w/e (week end). Like "XYZ Ltd Trading as ABC" (t/a) and "Not applicable" (n/a) ...
by mikeb
Sun Nov 15, 2020 5:10 pm
Forum: C programming
Topic: Need advice on VIA control (PORT A)
Replies: 6
Views: 2827

Re: Need advice on VIA control (PORT A)

... based on the code, do you think it is just "electronic noise" or it's actually doing things like "opening and closing the tape relay" very fast? Please don't open and close the relay very fast, you will wear it out! Seriously, I can't recall if it was Oric or Enterprise, but one piece of softwa...
by mikeb
Mon Nov 09, 2020 5:38 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 18
Views: 2592

Re: Atmos excessive buzzing from speaker

I remember a weird phenomenon, when the relay is activated, the tape recorder turns, and when the relay is deactivated the tape recorder does not stop anymore, you have to unplug and re-plug the jackremote to "unjam" the relay ... Maybe that the tape recorder had a too much big motor? That's entire...
by mikeb
Sun Nov 08, 2020 5:18 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 18
Views: 2592

Re: Atmos excessive buzzing from speaker

no Oric I have here have a relay making any audible noises, Then either they are not the standard reed relays, or faulty. :) A relay should not make a "high pitch/frequency" noise when it open or close unless driven at a high frequency and it will not last long if that happen. Incorrect, it's norma...
by mikeb
Sat Nov 07, 2020 9:18 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 18
Views: 2592

Re: Atmos excessive buzzing from speaker

I don't think the internal relay would be that audible, the "click" I have on some machine is clearly from the speaker. I don't remember ever hearing the relay moving when running a CSAVE/CLOAD command It depends on your hearing -- it's a high frequency "plink" and it *is* audible when it opens and...
by mikeb
Sat Nov 07, 2020 5:37 pm
Forum: Technical questions
Topic: New Oric Project. The OriClone-1
Replies: 25
Views: 5123

Re: New Oric Project. The OriClone-1

LM7905: At 1A 1.1V (demanding at least 6.1v at input) LM7805: At 1A 2.0V (demanding at least 7.0v at input) In fact is it probably more easy to find a 7V power supply than a 6.1V And yeah all official power supply were 9V: So that does not really hold up. I'm aware the original power supply was nom...
by mikeb
Fri Nov 06, 2020 5:49 pm
Forum: Technical questions
Topic: ULA versions
Replies: 13
Views: 3485

Re: ULA versions

PHILIPPINES HCS10017 Probably remarked by some chinese? Where does these come from? They come from Australia :) But: see my response above, someone has photographed/notated the number from the UNDERSIDE of the chip, which is not useful in this table. Take any ULA and flip it over, see what's writte...
by mikeb
Fri Nov 06, 2020 5:44 pm
Forum: Technical questions
Topic: New Oric Project. The OriClone-1
Replies: 25
Views: 5123

Re: New Oric Project. The OriClone-1

Using the 7905 was a mistake, especially because using a 7805 would have not created any issue. I really think that the choice of the 7905 was more for $$ than anything else Incorrect, at least, according to official answers and data. :) The reason for the choice of 7905 over the 7805 was the lower...
by mikeb
Fri Nov 06, 2020 5:32 pm
Forum: Hardware hacks and extensions
Topic: Expansion port for external ROM and /ROMDIS line
Replies: 12
Views: 1266

Re: Expansion port for external ROM and /ROMDIS line

screen and font corruption reappears as before. Interesting experiment, well done for persisting with it! That line alone tells me your EPROM is putting data onto the databus at the wrong time. It is treading on the ULA's use of the database in the "ph2 is low" half -- well, two thirds, of the cloc...
by mikeb
Sun Nov 01, 2020 6:17 pm
Forum: Hardware hacks and extensions
Topic: Downsway Joystick Interface reverse engineering
Replies: 13
Views: 1026

Re: Downsway Joystick Interface reverse engineering

mmu_man wrote:
Sat Oct 31, 2020 10:45 pm
Took some pics… I used my daylight lamp for this.
Flatbed scanners are good for this job too (right down to small surface mount bits if you can wring 1200 dpi out of them!)
by mikeb
Sun Oct 25, 2020 6:15 pm
Forum: Hardware hacks and extensions
Topic: Expansion port for external ROM and /ROMDIS line
Replies: 12
Views: 1266

Re: Expansion port for external ROM and /ROMDIS line

I struggle to picture how the EPROM being "too fast" can be a bad thing -- it's not like it can deliver data *before* it was expected, treading on something else :) Too slow, yes, big problem! There's no tricks going on here to select the ROM early, knowing it will be late showing up with the data -...
by mikeb
Fri Oct 23, 2020 4:07 pm
Forum: Hardware hacks and extensions
Topic: Expansion port for external ROM and /ROMDIS line
Replies: 12
Views: 1266

Re: Expansion port for external ROM and /ROMDIS line

Ooh, that's me :) I certainly don't think I invented that method (it likely fell in from another interface design elsewhere) and I can't think of a good reason why tying ROMDIS low wouldn't work, if you want to shove the internal ROM aside permanently. TBH, I'm not sure why I didn't just do that mys...