Search found 2983 matches

by duikkie
Fri Mar 14, 2014 10:18 am
Forum: 8-bit acorn hardware
Topic: Model B - Continuous 1st beep
Replies: 33
Views: 3915

Re: Model B - Continuous 1st beep

with chip are we toking now ?? i don't have sheet now but if it's the invertor (74ls04 ic33) chip by the 555 then pin 3 can by L or H but if pin 3 is low pin must be H , and if H then pin 4 low. like pin 1 must be low is pin 2 is 4.95 volt If I'm looking at the correct pin (assume top left = 1 and c...
by duikkie
Fri Mar 14, 2014 9:19 am
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

if you change the *cat in hit shift-break to continue it may be not a virus but i think almost 99,9% will press it , if nothing happens , no one will make a problem. but your disc has a program. look at mmc sd card the first cat. is option 3 (exec) and a !boot then menu. even menu is macinecode. it ...
by duikkie
Fri Mar 14, 2014 8:34 am
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

you are almost asking for me to write a program , and because the most used disk system is now the sd card , with mmc software. always connected to the user port. i looked at the code and it looks if there is a card present, that where the virus or trojan will start up. is it not the same if every d...
by duikkie
Thu Mar 13, 2014 11:54 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

activator for nasty program :) can be osword &7D . how many do pay attention on this number ?
by duikkie
Thu Mar 13, 2014 11:42 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

is it not the same if every disk suddenly shows press shift break to play the games all your program's will be clean after format. but still not a virus ? To put this into perspective... On a system where the OS is in ROM and no vital part of it is loaded from disk (be that a floppy, a HDD or modern...
by duikkie
Thu Mar 13, 2014 11:38 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

do *cat and you get the same text, the virus is not on your bbc system, but on your disc's format will help :) if you suddenly see a *cat where it say's shift break to continue to play the games how many will press the shift-break key ? Irrelevant. Switch off, then on again (no SHIFT-BREAK)? See any...
by duikkie
Thu Mar 13, 2014 11:17 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

if you suddenly see a *cat where it say's shift break to continue to play the games how many will press the shift-break key ? If you can make it happen even after a power-off-on cycle then possibly. But again, if you have to MAKE it execute something to do this then no - it is a Trojan. If it can't ...
by duikkie
Thu Mar 13, 2014 11:13 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

but mmc card and eeprom at28c256 are at risk Actually you can't because you still have to actively, i.e. deliberately, execute the code which will hook itself into the appropriate vectors. On a BBC B, unless you burn something into ROM, or change the keyboard links to alter SHIFT-BREAK behavour this...
by duikkie
Thu Mar 13, 2014 11:07 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

to copy your own *.cat on every disc you what to *.cat is a virus to active virus you can use random number the disc is write to ?? Copy protection it one thing - a virus is something entirely different. I still hold by my original asserstion that with the OS and DFS/ADFS in ROM it is, for practical...
by duikkie
Thu Mar 13, 2014 11:02 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

is there someting else then machine code ???
by duikkie
Thu Mar 13, 2014 11:01 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

run my menu1 that i uploaded by ripping rom from bbc it's a program that will stay on your bbc util you power off it checks for a command, if so it swaps SWR sideway ram's thats not the problem :) Hi duikkie, With the BBC you can have an infected floppy, but there is virtually no practical way of in...
by duikkie
Thu Mar 13, 2014 10:54 pm
Forum: 8-bit acorn hardware
Topic: Model B - Continuous 1st beep
Replies: 33
Views: 3915

Re: Model B - Continuous 1st beep

No Scope I'm afraid. multi meter ? yes ! oke i think you can see with multi meter a low or Hi signal on pin 3 or 4 ic33 pressing and holding the break key i hope the multimeter can see that ?? look out do not measure to pin's multimeter measure pin is very big !!! , a scope pin is like a needle. th...
by duikkie
Thu Mar 13, 2014 9:03 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

i also can't make a copy of the 3 left disc's because .....

i did have a master create program , but don't know where
it is called like try567 or so
by duikkie
Thu Mar 13, 2014 8:54 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

i don't know circus games. i will not tell you exact how i did it :) but here is the big picture maybe i forget something i wrote this software 30 years ago it wordks with 8271 only because discdoctor can look for track 0 sector 0 there is no track 0 sector 0 the normal way in real there is also way...
by duikkie
Thu Mar 13, 2014 7:08 pm
Forum: 8-bit acorn software: other
Topic: Micron Eprom Programmer
Replies: 31
Views: 4837

Re: Micron Eprom Programmer

mmmmm to much chips for the at28c256 eeprom this one can program a lot more i think and need vpp the use 27ls244 and i see 7404 can't make out all the lines ;) can you look inside , how did they solve the problem with a0--a7 to a8--a15 i am thinking about making a prommer for the 28c256 now with 1 m...
by duikkie
Thu Mar 13, 2014 6:52 pm
Forum: 8-bit acorn hardware
Topic: Model B - Continuous 1st beep
Replies: 33
Views: 3915

Re: Model B - Continuous 1st beep

If the machine is totally dead, (no sound at all) and you are sure the power supplies are present and correct, first thing to check is the 16MHz crystal (easier if you have an oscilloscope.) ISTR it's somewhere near the 6502. This signal is divided down by the Video ULA to provide 8MHz, 4MHz, 2MHz a...
by duikkie
Thu Mar 13, 2014 6:48 pm
Forum: 8-bit acorn hardware
Topic: Model B - Continuous 1st beep
Replies: 33
Views: 3915

Re: Model B - Continuous 1st beep

odin wrote:No Scope I'm afraid.
multi meter ?
by duikkie
Thu Mar 13, 2014 4:41 pm
Forum: 8-bit acorn software: other
Topic: Micron Eprom Programmer
Replies: 31
Views: 4837

Re: Micron Eprom Programmer

zip do not open ??

solved :)
by duikkie
Thu Mar 13, 2014 4:37 pm
Forum: 8-bit acorn software: other
Topic: Micron Eprom Programmer
Replies: 31
Views: 4837

Re: Micron Eprom Programmer

oeps see a zip :)
by duikkie
Thu Mar 13, 2014 4:35 pm
Forum: 8-bit acorn software: other
Topic: Micron Eprom Programmer
Replies: 31
Views: 4837

Re: Micron Eprom Programmer

can you look inside , how did they solve the problem with a0--a7 to a8--a15 i am thinking about making a prommer for the 28c256 now with 1 mhz bus using 74hc243 four of them 1 74ls04 and line jim and fred to select a8-a15 do you have the program ?? love to see it. Is there a kit to make it? Not that...
by duikkie
Thu Mar 13, 2014 4:21 pm
Forum: 8-bit acorn hardware
Topic: Model B - Continuous 1st beep
Replies: 33
Views: 3915

Re: Model B - Continuous 1st beep

do you have a scoop ?? my 8 mhz line on bbc b iss7 was with spike it came from ic 81 discdrive chip if you have scoop , check first power up reset then signals on ic43 pin 6 do you have 16mhz then ic6 pin 7,6,5,4 Hello, I have read about this fault from several forum searches but so far haven't reso...
by duikkie
Thu Mar 13, 2014 3:56 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

i did not rember this part but by 3 wrong passwords
picture
by duikkie
Thu Mar 13, 2014 3:29 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

billcarr2005 but you can still see track 0 sector 0 that dd3 fauth, you can than go further, i do not have sector 0 on track 0, if you look at how 8721 handles disc's with no sector 0 on track 0 then you understand why discdoc can't see my disc ;) but this was not about my writing about my playing w...
by duikkie
Thu Mar 13, 2014 3:18 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

this pictures comes after press shift break. but a little away from virus but
this was what i wrote in 1985 for the 8721 chip and disc's
by duikkie
Thu Mar 13, 2014 3:10 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

mmmmmmm but it did not use passwords and also i think they did not play with the 8721 i will show you more pictures with wrong password , bbc locks discdocter can't see sectors , because my disc's don't have sector 0 where it has to be for discdocter , somewhere hidden , the discdrive makes also fun...
by duikkie
Thu Mar 13, 2014 2:48 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

see my next picture , i can make a floppy that you only can get to with a shift-break, this is the !boot and !boot can load other stuf a real virus do not show the text of couse , only program the ctrl break to do shiftbreak. thus writing sector 0 with codes like picture. after panic most people wil...
by duikkie
Thu Mar 13, 2014 2:36 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

this is what you get with *. or *cat
by duikkie
Thu Mar 13, 2014 2:21 pm
Forum: 8-bit acorn software: other
Topic: are there virus software written for bbc b ?
Replies: 49
Views: 2930

Re: are there virus software written for bbc b ?

for the fun of it look at rom ripping program menu1 that i uploaded it surviving a ctrl-break and break. but no power off ,ofcourse but with mmc or eeprom (at28c256) i can ( will not) write program's that live even a power off. also what is not know that on disc you write the whole sector there is a...

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