The Sinclair QL Forum

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

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...

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...

Thanks Derek, I still have a hardcopy of this book but it's starting to fall apart now :( Unfortunately, some errors in the original book have been carried over to the digital version. These are from my annotations: Page 108: EXG mode bits 10001 are of course for Dx,Ay not Dx,Dy Page 112: LEA instru...

Well, you only need io.serio/io.serq when writing a device driver. Not many people have taken up that challenge. And not straightforward to use, since it contains absolute long pointers to the actual handling routines. Which means you have to set up the code in RAM unless you're absolutely sure abo...

Oops, I missed that! Must have been too busy lately...
Thanks everyone!

Jan

Hi, Is it possible to use the PAN command in a overwrite mode, so that the foreground is PANned left or right leaving the background unchanged. Unlike the Spectrum, the QL display doesn't have such thing as an 'attribute file'. A pixel doesn't have a background or foreground colour, it just has a c...

Some more corrections I have annotated: Page 19, MT.CJOB: On QDOS <1.1(AH,JM), when D2 = 0 then D1 may not be -1. Better avoid this by allocating a few bytes of code for a JMP instruction and $4AFB + job name. Also, if A1 <> 0 then on exit A0 = A1. Page 98: A polled list routine MUST preserve regist...

RalfR wrote:What bothers me most about the official SMSQ book is that the original QDOS names are not mentioned.

Because of copyright reasons?

IIRC there was some confusion in that book about the RI stack. (Mine only lasted a few days before it split into numerous pieces, so I dont have it.) Perhaps others can confirm? IIRC the only confusion was about the order in which the CA.GTxxx vectors evaluate parameters - the book states that they...