Author Topic: SYMBOS 3.0, M4 Board and CRTC 2  (Read 705 times)

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Offline ajcasado

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SYMBOS 3.0, M4 Board and CRTC 2
« on: 23:26, 02 November 20 »
Hi,First of all I want to greet everybody in this forum, this is my second post and i forgot to say hello in the first  :picard:

I have a CPC664 with the CRTC type 2 and the M4 version of SYMBOS 3.0 freezes loading at the splash screen.

For anyone with this issue it can be bypassed making a snapshot with the M4 hack menu after the CPC screen gets out of sync (i wait about 30 seconds in this state before entering the hack menu) and editing the snapshot file with an hex editor then changing the CRTC registers at offset 43 through 54 (http://www.cpcwiki.eu/index.php/Snapshot#Snapshot_.28.SNA.29_file_format)  copying this values from a snapshot taken just after powering on the CPC.

SYMBOS can then be started loading the modified snapshot.
« Last Edit: 23:29, 02 November 20 by ajcasado »
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Offline GUNHED

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Re: SYMBOS 3.0, M4 Board and CRTC 2
« Reply #1 on: 17:35, 03 November 20 »
Try a previous version? Maybe RAM ist too low.
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Offline ajcasado

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Re: SYMBOS 3.0, M4 Board and CRTC 2
« Reply #2 on: 17:53, 03 November 20 »
I have the awesome Z-MEM from TotO, RAM size is not a problem anymore.  :D

The previous 3.0RC version load ok, the problem is the overscan mode used with the splash screen showing the SYMBOS logo and the loading progress bar, the CRTC configuration is not compatible with the CRTC2. You can check it  with Arnold emulator if you don't have a CPC with the CRTC2.

Another issue is that inside SYMBOS the cursor movement with the arrow keys and copy button doesn't respond to the left arrow. This happens with all SYMBOS versions that I have tried, in any format, versions 2 and 3 in ROM, floppy or M4 sd card.
I'm waiting for the also awesome Imperium Solo from Duke to solve this issue using a proper pointer device. :D
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Offline GUNHED

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Re: SYMBOS 3.0, M4 Board and CRTC 2
« Reply #3 on: 19:17, 04 November 20 »
Z-MEM is cool (for many applications). Wish you luck with other issues, best is to report to PDT here via PM.
http://futureos.de --> Get the revolutionary FutureOS (Update: 2021.01.24)
http://futureos.cpc-live.com/files/LambdaSpeak_RSX_by_TFM.zip --> Get the RSX-ROM for LambdaSpeak :-) (Updated: 2021.07.15)