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Do not forget that old dutchman there is a mmb solution fit te tube port that i think not a problemen with pi tube it is called usb smart forum tube with a China usb chip . it was a project wit software Finding it in this forum is difficult i know

for bbc + the mm.... the right one works better because of the page the smart-spi will always work :) , but page at &1900 further smart-spi has things that mm.... ? do not have like *dput and *dget mm.. ?? has a few other commands i think smart-spi is the best rom every for bbc :oops: :^o [-X :shock...

oke what did you try so far ? try to read track 0 ID markers , with a simple machine code program in the advanced disc book try this with more then 10 sectors , maybe 20 or 50 ? preform a seek 0 , before you read id numbers on track 0 maybe you hear the arm moving ? if not then track 0 is track 0 :)...

the intresse thing is what happens if the disk drive controller can not make sense and it is not a error :) , a disc drive controller trys a lot ( the 8271) before it report an error. then comes the dfs mostly programmed for BBC standaard discs format. and is not that good if something is different....

most of the protection disc are tested by discdocter and exmon1 , that what i did in the old days :) later came exmon2 and adi or was it something with copydisk III i think that track 0 is not at track 0 , but somewhere in the middle of the disc. did you scan the whole disc for id track numbers ? ev...

do you really asking the programmer to write down how this is done ? it is a sort of game :) , there are people who dig in a program like ADI2 to find a weak spot then use it :) i personaly know a few tricks that i have not seen there yet , and i will not tell :) i do not know if this disc use somet...

for this old man , give me a hint where to buy things like this. bigger is better to see

JudgeBeeb wrote: ↑

Fri Sep 28, 2018 11:20 am

A digital microscope (in a vain attempt to improve my SMT soldering skills)...


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...and a silicone mat to stopping me burning the table when doing said soldering.


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is 275V not the new standaard ? where old ones not to 250 volt ?

look at pictures i think that the board had to deliver to much power :( but what are the big black thinks :) a schematic of a 36 volt 16 or more AMP loader will help ofcourse this one is special made voor limpurg :( on ebay this https://www.ebay.co.uk/itm/10S-30A-36V-Li-ion-18650-Battery-BMS-PCB-Pro...

a chip can be faulty in different ways
most of the time a part of a chip is still working

if your still have problems maybe open up your beeb ?

maybe some chips are missing for dfs ?? not propper installed ?

turbo mmc must work if rom is there

try :

*help

then
*dmmc or *card

mmm that is a first turbo mmc was working and the SPI rom not ?? both use the same routine for checking the card and user port. they do not work together ! one at the time :) first check your keyboard. if that gives problems the whole beeb has troubles. maybe a key is pressed or hangs ? second check...

if people make things , perhaps it is useful to explain what they have made ??

very strange is that the programmers not use to check in the main program if the disck with track 1 is still there ???

sub program : read id's of track 1 eor with data if not a result disk is not org. disc. bad disc/program

oke know how it is done :) the m code with !boot reads every time track 1 sector 0 , because all sectors are 0 :) now how to get every sector 0 in memory &2000 ... &2a00 it is timing. riscky but that is why i do not work on every dfs. from &30d9 to &312c they are syncing the disc time at &312c they ...

oke :) it is hot , and i am an old man. maybe that is the reason i do not read every thing that is written :) ?? oke this is the fix still not sure if it runs oke ? too hot to try ? As Col wrote here, there's already a fully working version (not that another version / method can hurt!) https://stard...

oke this is the fix still not sure if it runs oke ? too hot to try ? i have changed !boot in menu part line 1 to 480 (first part) del line 20 and 80 this program is now &1e8 big loaded at 1900 normale put a up loader at &2100 the hack part at &2200 to &2400 first download hack from &2200 to &900 the...

oke test2.ssd almost what the programmers had in mind the menu is allso the begin screen :shock: the *exec !boot and load menu till line 850 if you delete every think after that there is more room the ?&8f=127 i know understand the second time it is ?&8f=0 and the hole menu is loaded :) still not su...

is this working on a real beeb ? i don't have here a real bbc to test :( test this ! i am not a player . how to move in this game ? i have to lose !boot. because the disc is full changed program menu you need to do pa.=&2200 ch."menu" do not know about the ?&8f=127 ??? try it ? see test i think if y...

test this ! i am not a player . how to move in this game ? i have to lose !boot. because the disc is full changed program menu you need to do pa.=&2200 ch."menu" do not know about the ?&8f=127 ??? try it ? see test i think if you add *lo. hack 900 to menu program then it will work oke ? *save "hack"...

i think if you add *lo. hack 900 to menu program then it will work oke ?

*save "hack" 900 +200 900 900

if we want to know what is going on we need the disk track ID from track 0 and track 1 the !boot i think is on the real track 0 , loads track 1 with delayes own nmi routine (&d00) comparing every loading sector with the one it has loaded in memory at 2000 to 2a00 looking only from 20CC on, till 2100...

by 8271 you don't need track 0 , sec 0 sec1 and sec2. look at my disc protect systeem :). if the 8271 do not find after index hole track 0,sec0,1 it steps 255 times all over de disc to find it :) so track 0 sec1,sec2 can be at track 9 the only thing you have to do is make track 9 the ids for track 0...

yeah, but how ? if a discchip(8271or1770) reads a sector it is the hole sector 128 bytes, (like &e00)you can set you memory 51 bytes futher that you can do so the next sector comes &e52 and so on. but then you must know which sector is the start . if a track has more the same sectors id , the you ha...

how do you see that happening ? if id is the same the first good id that the head finds it loads in memory ? so how is it only 51 bytes ? or is there a program that knows load sec and then if same read again ?? [snip] Then I had a eureka moment, may be track1 had sector's 1to9 hidden. BillC confirme...

i am a old men pc's are to moderne for me

i can only work with paper , pencile and so on

i even have plastic things with symbols to draw

there is one protection on disc i have not seen yet :) , maybe one day someone will use the found "bug"in formating a disc and use it for protecting a program :) i used it ones for demo was a disc with invator or someting : , with tank en houses at th the bottom of the screen. but my protecting disc...

no more people use a system that has more track 0 , my protected disc use bad track 0 , track 1 , track 2 = track 0 and i do not rember but was track 4 not also track 0 . it only wordks with 8271 , because there you have a command for skip bad tracks. but maybe all chip controles looking for track 0...

viewtopic.php?f=3&t=12385&p=157867&hilit=psu#p157867

read this

there is on this forum how i fixed a bbc psu, someone can find the link for you ? i am very bad in finding things there are a lot of things that can go bad on a psu , mostly it is the flyback that stops the psu from working try to find the link. sometime a transistor looks good but is bad , and so on