Search found 566 matches

by stefano
Wed Apr 03, 2024 2:32 pm
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 51
Views: 2709

Re: Enhanced ARX True High Resolution Display Driver

I see. I will try to merge your code, but as you probably saw the z88dk driver is rather different.
by stefano
Wed Apr 03, 2024 12:59 pm
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 51
Views: 2709

Re: Enhanced ARX True High Resolution Display Driver

Some more sample programs ;)
arx_sampler.zip
(46.17 KiB) Downloaded 14 times

Some of them required a manual build of lib3d.lib altered with the -IXIY trick, yet another todo for the z88dk project :roll:
by stefano
Wed Apr 03, 2024 10:34 am
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 51
Views: 2709

Re: Enhanced ARX True High Resolution Display Driver

The resulting programs after my crappy fix: could anybody see if it fixes the problem ? I could have introduced the problem trying to reduce the code size (e.g. heavily relying on ROM calls) because changing the way to test the BREAK condition is apparently enough to solve the problem. The code size...
by stefano
Tue Apr 02, 2024 1:45 pm
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 51
Views: 2709

Re: Enhanced ARX True High Resolution Display Driver

Hello, I remember that behaviour, I never understood it was appearing because of the ZXpand interface! I was finally able to reproduce the problem, I'm inserting a simple fix which solves on EO. The current driver code is here, it is quite different from the original one because it includes video ef...
by stefano
Thu Mar 07, 2024 3:32 pm
Forum: Hardware
Topic: ZX81 floppy disk systems
Replies: 17
Views: 6883

Re: ZX81 floppy disk systems

A brand new video showing a F.IZ. disk drive controller in the ZX Spectrum version

https://youtu.be/7Js6sFHqqX4
by stefano
Mon Nov 27, 2023 8:59 am
Forum: ZX Spectrum Lounge
Topic: How to run .TRD spectrum files ?
Replies: 3
Views: 19721

Re: How to run .TRD spectrum files ?

The TRD format is a pure sequential, sorted dump of the disk sectors. The formatting is guessed by the emulator depending on the file size.
I suggest to try with SAMDISK, it is usually able to convert to other disk dump formats by adding the needed extra detail.
by stefano
Mon Oct 09, 2023 5:18 pm
Forum: Software
Topic: Dallas game port (32K)
Replies: 0
Views: 22280

Dallas game port (32K)

There's surely space for improvements, like a colour version of the game or trying to exclude the initial banner and compress the maths by using the ROM. By the way here's a first, mostly untested version of the DALLAS game for the Lambda with 32K RAM, in the three ROM flavors (V1, V2, and CAC3/NF30...
by stefano
Mon Oct 09, 2023 1:04 pm
Forum: Lambda 8300/ Power 3000 Lounge
Topic: NF300 and CAC-3 peculiarity
Replies: 0
Views: 24597

NF300 and CAC-3 peculiarity

This is an odd one. While disassembling the CAC-3 and NF300 ROMs I ran into a strange behaviour of th STK-FETCH routine. First of all, differently than on the ZX81, it was positioned at $20 permitting it to be invoked by RST rather than CALL and save a couple of bytes every time. Ok, that happens al...
by stefano
Fri Oct 06, 2023 3:22 pm
Forum: Lambda 8300/ Power 3000 Lounge
Topic: Different ROMs for Lambda 8300
Replies: 42
Views: 52218

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...
by stefano
Wed Oct 04, 2023 8:07 pm
Forum: Lambda 8300/ Power 3000 Lounge
Topic: Different ROMs for Lambda 8300
Replies: 42
Views: 52218

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 ...