UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Gemini 80-Bus System

john_newcombe · 29th Sep 2019, 8:22 am

That's good news, well done. If the hardware is different as you suspect, I guess I won't see this working on my hardware.

Just as a matter of interest, is there a way to emulate a 4Mhz clock speed? I can see a cpuclock parameter in the config file but changing this from 1 to 0 stops the boot process. I ask so that I can test a delay routine i have coded.

I am currently working on coaxing the scsi2sd card (in xebec mode) into life via the GM839 SASI port and at the moment I cannot even select it, it hangs waiting for the msg bit so rather than looping in a waiting condition I want to use a delay so that I can investigate what is actually being returned etc. The scsi2sd xebec mode is probably not a complete implementation but I will persevere as I like the additional level of authenticity. Perhaps one day I can get hold of the Xebec card and move the disk emulation down the line a little.

29th Sep 2019, 8:22 am	#238
john_newcombe Hexode Join Date: Apr 2019 Location: Skipton, North Yorkshire, UK. Posts: 252	Re: Gemini 80-Bus System That's good news, well done. If the hardware is different as you suspect, I guess I won't see this working on my hardware. Just as a matter of interest, is there a way to emulate a 4Mhz clock speed? I can see a cpuclock parameter in the config file but changing this from 1 to 0 stops the boot process. I ask so that I can test a delay routine i have coded. I am currently working on coaxing the scsi2sd card (in xebec mode) into life via the GM839 SASI port and at the moment I cannot even select it, it hangs waiting for the msg bit so rather than looping in a waiting condition I want to use a delay so that I can investigate what is actually being returned etc. The scsi2sd xebec mode is probably not a complete implementation but I will persevere as I like the additional level of authenticity. Perhaps one day I can get hold of the Xebec card and move the disk emulation down the line a little.