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From Wikipedia:
During the initial CoCo 1 production run, much of the discrete support circuitry had been re-engineered into a handful of custom integrated circuits, leaving much of the circuit board area of the CoCo 1 as empty space. To cut production costs, the case was shortened by about 25% and a new, smaller power supply and motherboard were designed. The "melted" keyboard from the white CoCo 1 and the TDP-100 style ventilation slots were carried over. Aside from the new look and the deletion of the 12 volt power supply to the expansion connector, the computer was compatible with the previous generation. The removal of the 12V power supply crippled some peripherals such as the original floppy disk controller, which then needed to be upgraded, installed in a Multi-Pak interface, or supplied with external power.
The CoCo 2 was sold in 16K and 64K models. 16K models use 16Kx1 DRAMs, but the chips are not the common 4116; they were instead 4517s (Radio Shack P/N 8040517),[10] which use only +5V power rather than the triple voltages used by the 4116. 64K models use standard 4164 chips and have a control register at $FFDE/$FFDF to switch between the second 32K of RAM and the OS ROMs. With the ROMs banked out, the entire 64K of system RAM can be accessed.
Upgraded BASIC ROMs add minor features and fix some bugs. A redesigned 5-volt disk controller was introduced with its own new Disk BASIC ROM (v1.1). It adds a new command, DOS, to auto-boot software from disk (this requires a disk with a special boot sector). This allows the use of software on copy protected disks or third-party operating systems, chiefly OS-9.
We have a 30-day return policy for all Brand New Items, which means you have 30 days after receiving your item to request a return.
We have a 30-day replacement policy for all Pre-Owned Items, which means you have 30 days after receiving your item to have any malfunctioning part replaced with another of the same item.
To be eligible for a return of a Brand New Item, your item must be in the same condition that you received it, unworn or unused, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us by calling the store at (518) 823-4471. If your return is accepted, we can either send you a return shipping label to your email address used for the purchase, as well as instructions on how and where to send your package, we will deduct the cost of the return shipping label from your final return value. Alternatively, you can use your own shipping method to return the items. Any items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question by calling the store at (518) 823-4471.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalized items), and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.