Search found 387 matches

by janbredenbeek
Tue Apr 28, 2020 9:51 pm
Forum: Software & Programming
Topic: ZX81 BASIC
Replies: 26
Views: 1752

Re: ZX81 BASIC

In ZX Basic, the AND operator just means 'if second operand is nonzero then take first operand as result, else 0'. This even goes for strings, a command like 'PRINT "hello" AND X' prints "hello" if X is nonzero and the empty string if X is zero. This cannot be reproduced on the Q...
by janbredenbeek
Sat Apr 04, 2020 10:56 pm
Forum: Software & Programming
Topic: Yet Another Software Question
Replies: 11
Views: 2643

Re: Yet Another Software Question

Hi All, The SMSQ/E manual page 29 mentions the possibility of using the keyword PIPE to communicate between EXed programs. PIPE is not a keyword but a device. Basically, it's a queue which you can write data ('PRINT') to by one job and input data from by another job. It's a bit tricky to use from B...
by janbredenbeek
Sat Mar 28, 2020 10:03 pm
Forum: Hardware
Topic: QL-SD ROM
Replies: 15
Views: 1086

Re: QL-SD ROM

Sensational! You've just opened new doors... If I remember correctly, the 768K Trumpcard (and clones) compromises the use of ROM port, or am I wrong? IIRC the Trump card only monitors a (first) access to the ROM port by the CPU to page in its extension ROM at $C0000 (note: not $C000) so the QL find...
by janbredenbeek
Sun Mar 22, 2020 11:21 pm
Forum: General QL Chat
Topic: Can we learn from Amiga OS?
Replies: 27
Views: 1634

Re: Can we learn from Amiga OS?

Oh dear - seems that something goes wrong when I edit a quoted reply - the forum software keeps adding quotes, even my own text got quoted!
by janbredenbeek
Sun Mar 22, 2020 11:16 pm
Forum: General QL Chat
Topic: Can we learn from Amiga OS?
Replies: 27
Views: 1634

Re: Can we learn from Amiga OS?

that's more or less what SpeedScreen does - It checks whether character positions align with font origins and handles this special case much faster than original QDOS. Well, in the end, QDOS doesn't literally call the PLOT routine, of course. Not only the character positions, also the various colou...
by janbredenbeek
Sun Mar 22, 2020 11:16 pm
Forum: General QL Chat
Topic: Can we learn from Amiga OS?
Replies: 27
Views: 1634

Re: Can we learn from Amiga OS?

that's more or less what SpeedScreen does - It checks whether character positions align with font origins and handles this special case much faster than original QDOS. Well, in the end, QDOS doesn't literally call the PLOT routine, of course. Not only the character positions, also the various colou...
by janbredenbeek
Sun Mar 22, 2020 11:14 pm
Forum: General QL Chat
Topic: Can we learn from Amiga OS?
Replies: 27
Views: 1634

Re: Can we learn from Amiga OS?

that's more or less what SpeedScreen does - It checks whether character positions align with font origins and handles this special case much faster than original QDOS. Well, in the end, QDOS doesn't literally call the PLOT routine, of course. Not only the character positions, also the various colou...
by janbredenbeek
Mon Mar 16, 2020 12:07 am
Forum: The Off-Topic Section
Topic: Covid19
Replies: 46
Views: 2600

Re: Covid19

In the Netherlands, universities are closed for students since last Friday. Following much discussion, the government decided on Sunday that all schools will be closed too until at least 6 April. Also, all pubs are closed, including night clubs and coffee shops. As this was announced on very short n...
by janbredenbeek
Fri Mar 13, 2020 11:11 pm
Forum: Software & Programming
Topic: MDV Software Reclamation
Replies: 48
Views: 3427

Re: MDV Software Reclamation

The rounding of numbers to 7 digits that occurs when SAVing is because S*Basic programs are saved as ASCII files, so the internal representation of floating point numbers gets lost. This is indeed a 'feature' of S*Basic I regularly ran across when I wrote programs for astronomical calculations which...
by janbredenbeek
Mon Mar 09, 2020 10:05 pm
Forum: Software & Programming
Topic: Announcing availability of a QLNET driver for the Q68 (ND-Q68)
Replies: 64
Views: 10736

Re: Announcing availability of a QLNET driver for the Q68 (ND-Q68)

Finally, my Q68 already has QL NET installed by Derek Stewart. Derek has performed a very professional installation, the connectors are firmly installed and very discreetly on the Q68 right side. Looks very good. I have recently fitted it myself but chose to sacrifice the power switch for it. Fitti...