Search found 629 matches

by janbredenbeek
Wed May 10, 2023 10:27 pm
Forum: Hardware
Topic: mgbe rom ?? - solved -
Replies: 11
Views: 4947

Re: mgbe rom ??

Day and month names are definitely Dutch, but the error messages are in English (with first letter in capital, unlike the Sinclair ROMs). The copyright message shows 1989 so definitely not an official Sinclair ROM. "I can't trap that" replaces "during WHEN processing", "I've...
by janbredenbeek
Thu Apr 27, 2023 11:51 pm
Forum: The Welcome Area
Topic: New QL user & owner
Replies: 47
Views: 29718

Re: New QL user & owner

I did some investigation, tracking back the seller of this QL on ebay. There was a second auction from the same seller where the "Sinclair QL EPROM Cartridge Board with an EPROM labelled 13-2-84 8000 0D0C as checksum" was sold. Most likely this would fit to this QL computer with the ZX-83...
by janbredenbeek
Wed Apr 19, 2023 11:03 pm
Forum: The Welcome Area
Topic: New QL user & owner
Replies: 47
Views: 29718

Re: New QL user & owner

With the upper 16K missing the RAM test should still work as this lies within the first 16K ROM. Given the fact that the test pattern doesn't appear, it looks like there is another hardware failure.
by janbredenbeek
Tue Apr 18, 2023 11:42 pm
Forum: The Welcome Area
Topic: New QL user & owner
Replies: 47
Views: 29718

Re: New QL user & owner

That looks like it's an early development machine used internally within Sinclair. The date on the ROMs would be about a month after the announcement of the machine in the media but a few months before the dongle encrusted machines made it into people's hands. I would be very surprised if the ROMs ...
by janbredenbeek
Mon Apr 17, 2023 10:34 pm
Forum: The Welcome Area
Topic: New QL user & owner
Replies: 47
Views: 29718

Re: New QL user & owner

- Most likely this QL came with a ROM port dongle holding at least additional 16 KB of the firmware (in a third 27128 EPROM IC), usually labelled 8000 (at address 8000 Hex). Do you have got a ROM port dongle or any additional EPROM ICs? If it's a FB ROM, you might be able to complete it using the Q...
by janbredenbeek
Sun Dec 25, 2022 4:27 pm
Forum: Software & Programming
Topic: BEEP
Replies: 4
Views: 852

Re: BEEP

No easy way, the QL's pitch range is rather limited compared to the Spectrum's. I've once written a BCSOUND procedure for implementing sound in BASICODE, which uses parameters similar to the Spectrum's, though the pitch is offset by 60 (which is middle-C). The QL's hardware limits the pitch range fr...
by janbredenbeek
Sun Dec 25, 2022 3:52 pm
Forum: General QL Chat
Topic: Happy Christmas Everyone!
Replies: 47
Views: 18709

Re: Happy Christmas Everyone!

Gelukkig Kerstmis!

Jan
by janbredenbeek
Tue Sep 27, 2022 3:07 pm
Forum: Software & Programming
Topic: Rounding in QSpread
Replies: 9
Views: 1536

Re: Rounding in QSpread

The Julian Day is not the same as the Julian Calendar. It is the date expressed in days from 1st January 4713 BC at noon and mainly used for astronomical calculations where a continuous day numbering comes in handy.

https://en.wikipedia.org/wiki/Julian_day
by janbredenbeek
Mon Sep 26, 2022 11:13 pm
Forum: Software & Programming
Topic: Rounding in QSpread
Replies: 9
Views: 1536

Re: Rounding in QSpread

I've used the method of converting between Gregorian Date and Julian Date from Jean Meeus. It is working fine with Abacus. I'm doing the same method with SuperBasic, but using "PRINT USING" to get the output to be what I need. Ah yes, I used the 'bible' from Meeus too (Astronomical Formul...
by janbredenbeek
Mon Sep 26, 2022 11:02 pm
Forum: Software & Programming
Topic: Rounding in QSpread
Replies: 9
Views: 1536

Re: Rounding in QSpread

I was not trying to balance my checkbook, but converting Gregorian data to Julian Day. The current Julian Day is 2459847.5, which will round up. The QL's FP system uses 31-bit mantissa so should be sufficient for about 9.5 digits accuracy. However when converting to ASCII it rounds to only 7 digits...