Search found 36 matches

by Badger
Mon Mar 25, 2019 7:14 pm
Forum: General Discussion
Topic: How good (or bad) my English knowledge is? - NonRelated question
Replies: 10
Views: 626

Re: How good (or bad) my English knowledge is? - NonRelated question

Overall, it is very good. It is very readable and understandable and as an English person , I don't need to do any translation in my head to decipher what is actually meant. If I was being very picky then some of the grammar could be improved but it in no-way detracts from the meaning of the post. S...
by Badger
Sat Mar 16, 2019 11:05 am
Forum: Technical questions
Topic: Oric Atmos Won't Initialise
Replies: 18
Views: 1072

Re: Oric Atmos Won't Initialise

It does sound like the reset circuit isnt working as it should. This might be a long shot but check that the reset swicth hasnt become clogged and locked closed electrically. It should be normally open. Once you get your logic probes you'll be able to test the clock signal is working. Other than tha...
by Badger
Thu Mar 07, 2019 7:04 pm
Forum: 6502 assembly coding
Topic: How to create random number with machine code?
Replies: 12
Views: 1928

Re: How to create random number with machine code?

Yes Goyo, there is a trade off between small fast code and randomness and if the seed isnt altered then it will be repetetive. In a game with lots of keypresses you could just re-seed the routine with the value of the timer ($304) on each keypress which would probably make it as close to random as p...
by Badger
Wed Feb 27, 2019 10:30 am
Forum: Demos
Topic: At last a smooth(ish) - pseudo hires horizontal scroll
Replies: 10
Views: 1059

Re: At last a smooth(ish) - pseudo hires horizontal scroll

I think its glitching after seven cycles, I think this is due to the fact that the character redefine is a lot faster than the scroll , addnext mountain and copy buffer to screen routines. Interestingly,, if I add a delay in each cycle it actually looks smoother. I'm playing around with a few things...
by Badger
Tue Feb 26, 2019 9:58 pm
Forum: Demos
Topic: At last a smooth(ish) - pseudo hires horizontal scroll
Replies: 10
Views: 1059

Re: At last a smooth(ish) - pseudo hires horizontal scroll

Corrected version attached. It was something silly on my part (isnt it always)

Still a little jumpy in parts, but hopefully can smooth it out a little more.

Will comment the source and then share it
asmscrol.tap
(1.31 KiB) Downloaded 36 times
by Badger
Tue Feb 26, 2019 9:11 pm
Forum: Technical questions
Topic: Dead oric 1
Replies: 48
Views: 3029

Re: Dead oric 1

Just looked at the circuit digram for the motherboard and it shows that C8 is connected the input voltage before the regulator. It is possible that this has failed and is causing the problem. Might be worth replacing this too.
by Badger
Tue Feb 26, 2019 9:06 pm
Forum: Technical questions
Topic: Dead oric 1
Replies: 48
Views: 3029

Re: Dead oric 1

Might be a silly suggesteion but have you tested the multimeter to check that it isnt showing eratic values. New batteries perhaps. I'm not sure how it would be possible to get 7v from the 7905 otherwise. Maybe if you have a spare and a breadboard, rig up a simple 7905 , resistor, LED and the 12v su...
by Badger
Tue Feb 26, 2019 7:17 am
Forum: Demos
Topic: At last a smooth(ish) - pseudo hires horizontal scroll
Replies: 10
Views: 1059

Re: At last a smooth(ish) - pseudo hires horizontal scroll

I'm not sure that this version is working correctly. It did work well when I was scrolling 2 "pixels" at a time but I think I tried to be clever and scroll it 1 pixel at a time. I only spotted it when I ran Oricutron in full screen mode. I'll have a good look through the code , fix it and then re-re...
by Badger
Mon Feb 25, 2019 9:47 pm
Forum: Demos
Topic: At last a smooth(ish) - pseudo hires horizontal scroll
Replies: 10
Views: 1059

At last a smooth(ish) - pseudo hires horizontal scroll

I'm putting this in demos since its not a complete game or anything, but feel free to move, delete etc etc. After several months of slaving over a hot 7905 regulator and multiple diversions whilst trying to teach myself 6502 assembly, I've finally created something I'm happy with. The result is a mo...
by Badger
Tue Feb 05, 2019 2:34 pm
Forum: Tape and floppy disk converters
Topic: TapOric - android TAP player for Oric
Replies: 66
Views: 17764

Re: TapOric - android TAP player for Oric

I'm preparing detailed info with results from output test of 4 different phones and instructions for a simple DIY cable. The Oric and Acorn BBC and Acorn Electron use the same cassette cables. For those who don't wish to make their own cable, BBC/Electron supplies are much more readily available th...
by Badger
Sun Feb 03, 2019 10:08 am
Forum: Tape and floppy disk converters
Topic: TapOric - android TAP player for Oric
Replies: 66
Views: 17764

Re: TapOric - android TAP player for Oric

It sounds like the headphone jack is stereo and the oric jack mono. If you look at the headphone jack it will have 3 or 4 metallic parts seperated by (usually) insulating material. The oric jack will probabably on have 2. It sounds like , that when you plug in the oric jack it is shorting out the cu...
by Badger
Fri Feb 01, 2019 10:23 am
Forum: 6502 assembly coding
Topic: How to create random number with machine code?
Replies: 12
Views: 1928

Re: How to create random number with machine code?

I discovered this online somewhere to give integers upto 255 :- getrand .( lda $01 beq doEor asl beq noEor ;if the input was $80, skip the EOR bcc noEor doEor eor #$1d noEor sta $01 rts .) All you need to do is seed $01 with any number at the start or again later with something like the value of the...
by Badger
Wed Jan 30, 2019 7:11 pm
Forum: Tape and floppy disk converters
Topic: TapOric - android TAP player for Oric
Replies: 66
Views: 17764

Re: TapOric - android TAP player for Oric

Works a treat, excelent app. I had a minor issue with the folder I used to transfer over from PC to phone that meant the app crashed and the only thing I could think of was the directory name was either too long or had spaces in it. I changed it to Oric and no problems since. By far the cheapest way...
by Badger
Wed Dec 26, 2018 9:50 am
Forum: 6502 assembly coding
Topic: Substraction and Addition
Replies: 4
Views: 835

Re: Substraction and Addition

That code for subtraction looks correct to me (not that I am any expert). I dont know if there is any faster way though. As for setting the carry flag, from whatr I understand it goes like this :- Consider a simple subtraction of X= 5 - 3 The way the processor handles subtration is actually via an a...
by Badger
Tue Dec 25, 2018 10:08 am
Forum: General Discussion
Topic: Christmas Break
Replies: 8
Views: 1045

Re: Christmas Break

Have a great christmas everyone and best wishes for #7E3

:D