[Coco] CoCo ROMS

[Barry Nelson]

> Richard Lorbieski
> Wed Sep 27 15:16:14 EDT 2017
> 
> Thanks for the info.
> 
>  I plan to update a FDC 26-3029 card that has a custom Tandy DECB ROM. The previous owner had his personal info burned into the bootup screen. 
> 
> Also need to burn a couple of Extended Basic ROMs.
The product below should work both for the disk controller rom and the internal roms.

http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/DOS%20Adapter.html <http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/DOS%20Adapter.html>

DOS Adapter
Bring Larger EPROMS To Your Disk Controller!
Give your vintage disk controller a boost with DOS Adapter. This product adapts 2764 and 27128 28-pin EPROMs to controllers that have antiquated 24-pin ROM sockets that accommodate the rare and hard to find 68766.

Not only does DOS Adapter provide you with the ability to use 28-pin ROMs, it also allows you to switch between two 8K banks when using a 27128 EPROM. Now you can have the standard Disk BASIC ROM in the lower 8K bank, and a customized DOS in the upper 8K bank. All selectable via a jumper!

Please note that the EPROM is NOT included.

Standard Features

Adapts 2764 and 27128 EPROMs to 24-pin footprints.
Can accommodate two 8K DOS's on a 27128.
Fits virtually all disk controllers.

Another option is to wire something yourself. I believe this wiring diagram should work.

https://www.64hdd.com/images/kern-3x8.gif <https://www.64hdd.com/images/kern-3x8.gif>