Re: Schematic for 80 Column Adapter for C64

From: RayBryan <>
Date: Sat, 24 Aug 2013 13:31:57 -0500
Message-Id: <>
Is that 82S100 the same as the one in the early C64 rev. boards?

|Raymond C. Bryan  651-642-9890 vox  |
|Raymond Computer  651-642-9891 fax  |
|2306 Robbins St.   - email raycomp   |
|St Paul MN  55114   at_visi_dot_com |
|USA               Amiga - Commodore  
|                                   |
|                                   |

On Aug 18, 2013, at 9:19 AM, wrote:

> On 2013-08-18, at 15:57, Steve Gray wrote:
>>> BTW - it reminds me like some years ago I put my hands on the  
>>> XEP-80 (an 80-column add-on for Atari "8-bitters"). This thing  
>>> plugs into... joystick port and joystick ports are the same in  
>>> both C64 and Atari series! Since I always wanted 80 columns too,  
>>> I immediately plugged this into my 64, spent a whole weekend  
>>> writing a driver that would properly serialize data and handle  
>>> required communication timings, then I bound it to the KERNAL so  
>>> that the default screen I/O would go over the XEP, and... yeah..  
>>> "gotcha!". Only then, when trying to type-in the first LOAD  
>>> command on the XEP display, I realized that no matter how hard I  
>>> try, I shall never be able to use the 80-cols display AND the  
>>> keyboard at the same time. I don't ever recall feeling as stupid  
>>> as I felt that Sunday evening... ;-)
>> I also picked up an xep80 hoping to get it working on the c64. I  
>> suppose you could connect it to the user port instead of the  
>> joystick port... Perhaps to one of those userport joystick adapters.
> After getting out of the mental hangover state I mentioned above, I  
> made an adapter and connected it to CASSETTE port (USER PORT is  
> constantly occupied by DolphinDOS parallel connection ;-) but my  
> enthusiasm was nowhere close to the level when I still naively  
> believed (and wondered why nobody has ever done this before!  
> Imagine?) that it could be handled purely with software and without  
> any modifications or extra adapters.
> -- 
> SD!
>        Message was sent through the cbm-hackers mailing list

       Message was sent through the cbm-hackers mailing list
Received on 2013-08-24 19:00:08

Archive generated by hypermail 2.2.0.