This is a tricky core, I tried it with 1 TV and 2 monitors and all of them identifies the video signal differently:
Samsung LE40B650: 800x600@60Hz
LG DM2352: 1280x600@60Hz
BenQ BL912: 1024x600@60Hz
Another issue is that the scandoubler disabled signal is non-SCART compatible, the BenQ, which has multisync capabilites, recognizes it as 720x288@60Hz. The main problem is in my opinion the lack of composite sync, it provides separated horizontal and vertical syncs instead. In case of true interlaced output the BenQ would display 576i@60Hz.
I recommend to use the HT1080z core, this hungarian school computer is basically a TRS-80 Model 1 (with Level II BASIC) clone, supplemented with an AY-3-8910 sound generator and additional 8-bit I/O circuit.
The original computer's homepage:http://ht.homeserver.hu/
And the core made by Joco:http://joco.homeserver.hu/fpga/mist_ht1080z_en.html
The video output is standard 640x480@60Hz VGA and 576i@50Hz over SCART.
It supports .cas loading. If you want to convert CMD files to CAS, here is a utility written by Attila Grósz (source code and english howto included).
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