Search found 393 matches

by tcat
Thu Sep 21, 2017 5:34 pm
Forum: Software & Programming
Topic: ATARI ST SMSQ/E
Replies: 8
Views: 407

Re: ATARI ST SMSQ/E

Hi, Being owner of ATARI ST, I am curious to give it also a try. I read somewhere, cannot now remember the source, that SMSQ/E was originally designed for ATARI ST, as initially QL did not have enough computing resources, only later when Gold/Trump cards came around with more memory and CPU, was pos...
by tcat
Thu Sep 21, 2017 5:27 pm
Forum: Software & Programming
Topic: Call SuperBASIC from M/C
Replies: 3
Views: 128

Call SuperBASIC from M/C

Hi, I have done some basic assembly coding for the QL, suited for the CALL command from within SBASIC program. Now I may face writing a SBASIC extension, something I have not done before, though there are some nice examples to draw on here in the forum, also QL Technical Guide gives essential info. ...
by tcat
Wed Sep 13, 2017 5:19 pm
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 44
Views: 3756

Re: ULA ZX8301 - TV Picture Capabilities

Hi Martin, ZX/ATARI over UHF modulated TV cable, picture is of good quality, this may exclude TV from fault finding, I should think. I did not try QL composite output, that would require feeding the signal to a yellow input socket on my TV, also bypassing modulator is needed for that, to get composi...
by tcat
Wed Sep 13, 2017 8:25 am
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 44
Views: 3756

Re: ULA ZX8301 - TV Picture Capabilities

Hi Nasta, Thank you, I was hoping for and awaiting your comment, too :-) Now again studying `QL Service Manual' and Issue#6 diagram. It says composite PAL signal is output/divided to UHF Modulator, capturing in the picture, when you say lowering amplitude, you mean changing values of the resistors R...
by tcat
Tue Sep 12, 2017 12:02 pm
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 44
Views: 3756

Re: ULA ZX8301 - TV Picture Capabilities

Hi Martin, Although in Hungarian, the schematics shows AZTEC modulator UM1233, the same model matching QL Issue#6 wiring diagram. It has got three transistors BF199. Any of those can qualify for replacement? In the QL diagram, there is smoothing elyt 100uF to supply modulator with 5V, not sure if it...
by tcat
Mon Sep 11, 2017 2:21 pm
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 44
Views: 3756

Re: ULA ZX8301 - TV Picture Capabilities

Hi Martin, Thank you. It seems AZTEC modulator found in both ZX and QL. I have looked up the transistor 2N2222 in a local electronics shop. With the specs below, hFe gain is not given, I guess what matters here is the frequency capability here. / FAIRCHILD / NXP NPN 40V/ 0,60A/ 0,62W/ >250MHz (= KSP...
by tcat
Sat Sep 09, 2017 6:31 pm
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 44
Views: 3756

Re: ULA ZX8301 - TV Picture Capabilities

Hi Martin, My TV is quite a modern Thomson make, it gives excellent picture with ZX Speccy and ATARI ST, all in TV mode, no flair in white. QL Picture over RGB-SCART cable is also perfect. I can try replacing PAL chip, though. Should it were the UHF modulator, I wonder what could be wrong with it, a...
by tcat
Sat Sep 09, 2017 7:53 am
Forum: Hardware
Topic: ULA ZX8301 - TV Picture Capabilities
Replies: 44
Views: 3756

Re: ULA ZX8301 - TV Picture Capabilities

Hi All, I am trying to catch up with the posts after holiday. It sounded here that from Issue 5 to Issue 6 transition, HAL was introduced to take care of address decode, originally task of ZX8301, so on Issue 6 boards there is a dangling unused pin on ZX8301. Interestingly just one pin ZX8301 was sh...
by tcat
Mon Sep 04, 2017 10:34 am
Forum: Software & Programming
Topic: Basic Shift Right
Replies: 20
Views: 808

Re: Basic Shift Right

Hi,

Yes, a mistake, division should be 2 power times.

`SHift N-times Right' = SHNR

Tomas
by tcat
Sun Sep 03, 2017 12:59 pm
Forum: Software & Programming
Topic: Basic Shift Right
Replies: 20
Views: 808

Re: Basic Shift Right

Code: Select all

100 DEFine FuNction SHNR (num, times)
110   RETurn INT(num/(2*times))
120 END DEFine SHNR

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