Search found 381 matches

by martyn_hill
Mon May 21, 2018 12:41 pm
Forum: General QL Chat
Topic: Cant get passed monitor. Tv select screen
Replies: 5
Views: 172

Re: Cant get passed monitor. Tv select screen

Hello broj446 Welcome to the QL! If you are seeing the display of the F1/F2 options, but nothing happens after hitting either key, chances are that you have a defective keyboard membrane and your keystrokes are not being detected by the, otherwise working, QL. That's easy (and pretty cheap!) to addr...
by martyn_hill
Sat May 19, 2018 8:30 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 11
Views: 605

Re: Today I Received...

Just loving the Gigatron!
by martyn_hill
Sat May 19, 2018 5:55 pm
Forum: Software & Programming
Topic: Adjusting the QNET timings on a QXL2
Replies: 3
Views: 170

Re: Adjusting the QNET timings on a QXL2

Hi again everyone With thanks again to Wolfgang in identifying a further adjustment to the start of the NET timing-constants table (ndt_ctab) held in the DDB of the NET driver, I can confirm that an adjustment of 5% to each of the timing-constants allows successful net operation on the QXL. Whether ...
by martyn_hill
Sat May 19, 2018 11:57 am
Forum: Software & Programming
Topic: Adjusting the QNET timings on a QXL2
Replies: 3
Views: 170

Re: Adjusting the QNET timings on a QXL2

Thank you Jan (and Wolfgang, via the QL Users list) Having now found what appears to be the DDB and taking account of the -$18 (24) offset from the link in the CDB, I can identify the NET device pointers from $18 through $33, with the distinctive RTS ($4E75/20085) appearing at $34 as expected. Howev...
by martyn_hill
Fri May 18, 2018 8:47 pm
Forum: Hardware
Topic: Random obscure survey...
Replies: 26
Views: 816

Re: Random obscure survey...

1024MAK wrote:Hmm, am I the odd one out...


Aren't we all the 'odd one out' by the very fact that we love the QL? I've rather prided myself on that identity!
by martyn_hill
Fri May 18, 2018 8:41 pm
Forum: Software & Programming
Topic: Adjusting the QNET timings on a QXL2
Replies: 3
Views: 170

Adjusting the QNET timings on a QXL2

Hi everyone Question: How do you find the Device Definition Block (DDB) base-address from SBASIC for the NET device on a QXL under SMSQ/E? Context: Whilst still exploring the QNET capabilities across various platforms, I purchased a refurbished QXL2 (8MB, 40MHz osc => CPUCLK @ 20MHz) from Derek a li...
by martyn_hill
Thu May 17, 2018 10:51 am
Forum: Hardware
Topic: QL Video issue - Red color missing
Replies: 12
Views: 622

Re: QL Video issue - Red color missing

Hi Raul In addition to the level-shifting resistors, you may well also need to convince the monitor/TV to switch to RGB mode via the SCART socket (SCART defaults to Composite Video instead of RGB.) There are various ways to do this, but the simplest seems to be to tap-off the Composite-PAL signal fr...
by martyn_hill
Tue May 15, 2018 5:53 pm
Forum: Hardware
Topic: Dead QL
Replies: 8
Views: 378

Re: Dead QL

Hi Greg Whilst the 8301 remains under suspicion, your latest findings do also suggest that either of the DRAM or else the bus transceiver (that inter-connects the CPU bus to the 8301's 'private' bus isolating the DRAM) might be shot. I don't believe the replacement 8301 is too expensive - assuming R...
by martyn_hill
Thu Apr 12, 2018 8:29 pm
Forum: Hardware
Topic: New video output system
Replies: 17
Views: 700

Re: New video output system

Great initiative Dave!

Will QVid v2 squeeze the visible scanline in to 64us to better suit the available upscalers (and PAL TV, for that matter...)?
by martyn_hill
Sun Apr 08, 2018 3:00 pm
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 62
Views: 4696

Re: All RAM chips destroyed??

Hi again Tomas As Rich said, the other positions of optional links are obscured by those three zero-ohm 'resistors' (note the single black-band == zero ohms). It apparently proves easier to automate the component assembly process using zero-ohm resistors rather than actual bare wires... The links in...

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