Search found 537 matches

by mk79
Fri May 29, 2020 11:17 pm
Forum: Help for New Users
Topic: What QL emulator do you recommend?
Replies: 10
Views: 1793

Re: What QL emulator do you recommend?

ql_freak wrote:
mk79 wrote:In the upcoming v5 this will be further extended, making interaction with PC drives even more seamlessly.


Tell us more!
EOF
EXE files can be saved on the DOS device (QEmuLator style) and file extensions are automatically converted ("_bas" vs ".bas").

Marcel
by mk79
Fri May 29, 2020 9:29 pm
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

Ruptor wrote:Then it hit me I can plug the home made EPROM in to the right hand ROM socket because the OE input is not used. :)
Um, what do you mean with "the OE input is not used"?
by mk79
Thu May 28, 2020 10:40 am
Forum: General QL Chat
Topic: Ebay QL sales
Replies: 4
Views: 150

Re: Ebay QL sales

I might have bought one for spares for £20 but not at those prices when you can get 3 year old Notebooks with a million times more power. :( The ULA chip alone is currently traded for something like £20 as they become increasingly rare. Same with power supplies, they alone go sometimes for 40€. I'v...
by mk79
Wed May 27, 2020 10:07 pm
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

DTACKL looks normal. Not sure about OE. I've measured these on my QL for reference, you have much more ground noise, but could be that the Samsung QLs were better in this respect.
DTACKL:
HAL_DTACKL.png
OEL:
HAL_OEL.png
by mk79
Mon May 25, 2020 11:50 pm
Forum: General QL Chat
Topic: QL news told by the Spanish community
Replies: 6
Views: 300

Re: QL news told by the Spanish community

That does indeed seem like a very nice presentation. The automatic translation often was no help ("Amiga" became "friend" and "QL" was often "google" I think), but most of the time I got the gist of it. Though I almost lost it at "magic mirror sex style&q...
by mk79
Mon May 25, 2020 4:21 pm
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

Do all capacitors on your board look like a resistor?

Edit: OK, seems to be the norm with Issue <6 boards.
by mk79
Mon May 25, 2020 11:09 am
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

martyn_hill wrote:Thanks for correcting my understanding, Marcel! Time for me to look again at the Minerva source!
ss_ramt_asm, label "do_1st" ;)
by mk79
Mon May 25, 2020 11:08 am
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

Ruptor wrote:That is why other codes mathematically determined to identify where a fault might be with the least codes are used in a proper memory test.
Yeah, with these test being bigger than the whole of Minerva. There is not one byte to spare in that ROM.
by mk79
Mon May 25, 2020 9:31 am
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

one of the data lines has two levels making the signal look different to the others on the buffer. Lett me gess: D0? ;) The clock on the ZX8301 IC22 is 5.1 MHz and all hell breaks sometimes when I stick a scope on it to look at it. To me that sounds more like a problem with your scope than the ULA....
by mk79
Mon May 25, 2020 12:55 am
Forum: Hardware
Topic: Issue 6 VM12 & resistors confusion
Replies: 46
Views: 1412

Re: Issue 6 VM12 & resistors confusion

I have not read the whole thread, but just a few short comments: - Minerva does not write the whole RAM and only then starts to check it. In 32-bit steps it will write 1s to all bits, check them, then write the "random" value and check that, too. So your RAM check immediately fails on the ...