-
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... FILL routine). Because the second DEC (HL) instruction of this test ... logic analyser showed the memory test successfully went a good ... to capture the RAM-FILL routine passing from lower RAM ... written a little machine language test routine and perhaps that would ... -
Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... Ritman's random number routine, published in Your Sinclair ... Head Over Heels. The routine is quite fast and returns ... two DPs (0). The test routine, or a GO SUB ... VARS areas, this small routine can be merged into ... +INT (RND*50): REM test routine here
9995 NEXT ... -
problem with symbol shift and caps shift key combinations on multilayer keyboard membranesHello, I know, it is generally know that some ZX Spectrums with multilayer keyboard membranes have problems with some key combinations. Typically …
... problems. I rewrote keyboard reading routine by using part of someone ... i write very simple relocable test routine https://cygnus.speccy.cz/tmp ... -
How to return to basic properly from ASMI am messing around with a fast stack copying routine. But I am getting "A: Invalid argument" error when I later return to basic. I know you h…
... with a fast stack copying routine.
But I am getting ... shadow registers) before calling my test routine I do not see the ... -
128K memory testingDuring a mad half hour I decided to write a little memory tester program in BASIC using the information from the 48K service manual. Now I was wonder…
... /> You can read the ROM test routine here.
[url]http ... -
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... tedious and largely pointless memory test sequence performed by PC BIOS ... economically than the actual ROM routine. I'm sure the guy ... . The Spectrum routine as it stands does a rudimentary test which will ... out just fine in a test routine, but bits are found to ... -
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... out just fine in a test routine, but bits are found to ... -
Cross Platform DevelopmentWhat's the best way to develop cross platform apps? By best, the only limiting criteria would be "at no cost" :)
... as flashing attributes and a test routine) - with no optimisation, is less ... -
Cross Platform DevelopmentWhat's the best way to develop cross platform apps? By best, the only limiting criteria would be "at no cost" :)
... as flashing attributes and a test routine) - with no optimisation, is less ... fear is that the library routine may be implemented in C ... -
Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
... I guess is the Amstrad test routine).
Now select emulation -> ... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... to knock together a RAM test routine today but my boss decided ... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... to knock together a RAM test routine today but my boss decided ... /> Added features:-
BIT FADE test using inversion pattern.
test - with barcode display on ... screen. However, the test will end after 10 minutes ... -
Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …
... 0x0000 due to its memory test routine. So you have to do ... -
Test program for 128k machinesThere is a Test Program for 16/48k machines: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0008884&loadpics=3[/url] Is there a similar progr…
... has a dire ROM test routine.
I posted this to ... Research included a ROM test routine on their 'Test Program' (1985, Dr. Ian ...
[/code]
The routine return with zero set for ... -
+2 power not working. Need helpHi folks, I'm hoping someone may be able to point out what could be wrong/needs fixing here. One of my +2's had a loose RF modulator. The 5v wire w…
... and "1987" repeated is the test routine that you get if you ... -
Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…
... . I'll include my little test routine with the coloured columns, so ... -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... has something with his faulty test rig idea.
If ... something was plugged in (a test routine rom cart perhaps?) one of ... their test carts could have had a ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... the DivIDE eeprom, runs the test routine (black and blue bars to ... test video ram), and then it ... -
Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…
... tells us that the RAM test routine in the ROM consistently finds ... -
Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…
... address found by the RAM test routine. So, for what should be ... -
Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... 't detected by the RAM test routine that is executed at startup ... of some external device to test the RAM in-place, I ... -
Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... me that I configured the test routine to be able to store ... -
Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…
... Z80 works correctly (otherwise the test could have not run altogether ... PAL10H8 and A15, meaning the routine is probabily doing a lot ... uncontended RAM bank, and the test routine reported correctly a D6 fault ... and pass it through the test, just to see how it ... -
+3 disk drive alignmentCan these drives go out of alignment and if so, hows the best way to bring them back in?
The test routine in the ROM does something to test the drive, but I ... -
The Spectrum Show Episode 12Episode 12 of The Spectrum Show. In this episode we go back to February 1984 for all of the Sinclair news and latest Spectrum game releases. We comp…
EARTH DEFENCE is nice game :-)
[url]http://www.worldofspectrum.org/infoseekid.cgi?id=0001562[/url]
If anyone find adress of cursor position X,Y and keys test routine adress, then I can make patch for K-MOUSE controll :-) -
BIN2BAS (load BASIC text into emulator) utilityI've nearly finished testing this. It allows a BASIC program to be loaded from a text file in any emulator which has a "load binary" option. I was wo…
... the "Room for BC Bytes?" routine at ROM0:$3F66 fails with ... about 14kb of the 25kb test file, but stopped at around ... to write a separate insert/test routine so that I can locate ... both the ROM0 & ROM1 "test room" routines will fail on ... -
ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…
... the Spectrum ROM's RAM test routine works).
Update: A ... -
ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…
... RAM, but the initial RAM test routine passes part (perhaps just a ... -
+3 Membrane Scheme??I've been looking and only find the scheme Sinclair models, and would need to find the +3 keyboard scheme. Does anyone have it? Thanks
... to load up the keyboard test routine in the +3 ROM and ... -
+3 Membrane Scheme??I've been looking and only find the scheme Sinclair models, and would need to find the +3 keyboard scheme. Does anyone have it? Thanks
... , because as I know, keyboard test routine in ZX rom work correct ...
