Search found 568 matches
- Fri Oct 06, 2023 3:22 pm
- Forum: Lambda 8300/ Power 3000 Lounge
- Topic: Different ROMs for Lambda 8300
- Replies: 42
- Views: 53017
Re: Different ROMs for Lambda 8300
I'm halfway in the process of tracking the ROM differences on the CAC-3 and NF300 models. They're VERY similar, but apparently the NF300 is sensitive to the machine code included in a REM line, or perhaps the LOADed block, even if working, should be formatted slightly differently. So, supposing we h...
- Wed Oct 04, 2023 8:07 pm
- Forum: Lambda 8300/ Power 3000 Lounge
- Topic: Different ROMs for Lambda 8300
- Replies: 42
- Views: 53017
Re: Different ROMs for Lambda 8300
I'm close to the end of a first pass on the z88dk libraries. There's still a couple of very small differences between the lambda ROM (new type) and the cac3. It's a very small difference regarding the number to string conversion, I'll looks closer to the zx Spectrum, it lacks the string termination ...
- Wed Oct 04, 2023 8:50 am
- Forum: Development
- Topic: A scanner for you Zx81/Specturm.[WIP/DIY]
- Replies: 24
- Views: 14029
Re: A scanner for you Zx81/Specturm.[WIP/DIY]
When the TV brightness passed a threshold, the raster picture was generating a buzzing noise which was received by a software loop.
The software was changing the brightness of video portions to find the right spot you were pointing at
A scanner requires an audio oscillator I think?
The software was changing the brightness of video portions to find the right spot you were pointing at
A scanner requires an audio oscillator I think?
- Tue Oct 03, 2023 7:40 pm
- Forum: Development
- Topic: A scanner for you Zx81/Specturm.[WIP/DIY]
- Replies: 24
- Views: 14029
Re: A scanner for you Zx81/Specturm.[WIP/DIY]
I may be wrong, but it looks a similar concept to the light pen for the Spectrum, it was for the main part a software trick
- Mon Oct 02, 2023 1:22 pm
- Forum: Lambda 8300/ Power 3000 Lounge
- Topic: Different ROMs for Lambda 8300
- Replies: 42
- Views: 53017
Re: Different ROMs for Lambda 8300
I'm in touch to @olofsen, he shared his work and I'm merging as much as possible in the current z88dk tree. I'm working on the emulators so I'm not totally sure that the updated code is still generating valid raster pictures on the real TV sets, 50hz and 60hz, but the rest of the library is surely i...
- Sat Sep 30, 2023 1:13 am
- Forum: Sinclair Misc
- Topic: Can Anyone Answer These Questions - MW100 Printer
- Replies: 5
- Views: 6255
Re: Can Anyone Answer These Questions - MW100 Printer
I think it is worth to mention also the Seikosha GP50S. It was another one fully compatible with the zx printer
- Fri Sep 29, 2023 12:19 pm
- Forum: Development
- Topic: Sorting out the zx81 library set on z88dk
- Replies: 2
- Views: 4700
Re: Sorting out the zx81 library set on z88dk
I also updated the ZX81 specific version of DSTAR to get a valid version for the ZX80 with "NEW ROM" (aka ZX81 in FAST mode). It looks a bit flickery on EO, the results look much better in 50hz mode, but I can't predict how it will be on a real TV. Probably the "intelligent" color TV and LED TV chip...
- Fri Sep 29, 2023 12:17 pm
- Forum: Development
- Topic: Detecting if in FAST mode?
- Replies: 2
- Views: 4696
Re: Detecting if in FAST mode?
It is a bit of fun having the code repeatedly checking the hardware status! You might even add a switch on the 50/60hz diode and the raster frequency would change at runtime :) Thankyou for the information, at the end I chose a different approach and totally replaced the fgetc() code to reduce flick...
- Fri Sep 29, 2023 11:57 am
- Forum: Development
- Topic: Sorting out the zx81 library set on z88dk
- Replies: 2
- Views: 4700
Re: Sorting out the zx81 library set on z88dk
I finally succeded in getting the display visible in FAST mode also on the ZX81 and on the LAMBDA ROMs (untested).
This program should run correctly on a ZX80 with ZX81 ROM as well as on a ZX81.
This program should run correctly on a ZX80 with ZX81 ROM as well as on a ZX81.
- Thu Sep 28, 2023 7:36 pm
- Forum: Development
- Topic: Detecting if in FAST mode?
- Replies: 2
- Views: 4696
Detecting if in FAST mode?
I'm wondering what's the right way to check if we're in FAST mode.
I'm concerned in trusting the system variables because the ZX81 ROM can be running as a retrofit in a ZX80, which obviously is never in FAST mode.
I haven't fully understood how the SLOW/FAST subroutine works in rom
I'm concerned in trusting the system variables because the ZX81 ROM can be running as a retrofit in a ZX80, which obviously is never in FAST mode.
I haven't fully understood how the SLOW/FAST subroutine works in rom