[Coco] ADOS 3 Rom Question

[Darren A]

Yeah... that doesn't sound like an FD-502.  In addition to having a
28-pin ROM socket, the 502 (as supplied by Tandy) has the controller
chip soldered directly to the board.  Perhaps he has a 501 inside a
502 case.  The edge connector contacts are gold on a 501, but not on a
502.

Darren

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On 3/12/09, Arthur Flexser  wrote:
> Are you sure that's an FD-502?  According to my notes, the FD-502 is
> the one controller Tandy made that has a 28-pin ROM socket, which
> should therefore be directly compatible with your 28-pin ADOS-3 EPROM
> (though it requires a small modification to enable the upper 8K of ROM
> space to accommodate Extended ADOS-3.)  I suspect you actually have an
> FD-500 or FD-501.
>
> Art
>
> On Thu, Mar 12, 2009 at 4:44 PM, Derek <dml_68 at yahoo.com> wrote:
>> I just got a 28 pin ADOS 3 ROM chip and would like some help on installing
>> into an FD-502 Controller if possible. The Controller I have as 2 ROM
>> Sockets the 28 PIN ROM installed says WDC'83 with a chip number WD1773-ph.
>> The 24 Pin ROM is a Tandy Chip number SCM92128P. When I replaced the 28
>> PIN ROM with the Ados chip I bought it comes up with the standard Disk
>> Extended Basic screen. (I put back the original ROM chip and the
>> controller works fine so I did not destroy anything)