[Coco] ADOS 3 Rom Question

[Arthur Flexser]

Here's some ancient notes of mine on what needs to be connected to
what in order to get a 28-pin EPROM to work in a 24-pin socket.  Maybe
you could wire it up yourself, if you don't want to purchase a
satellite board:

>The FD501 has a 24-pin ROM socket, so you will need to jumper things.
>
>Here's what you need to do to get it to take a 28-pin EPROM. First, on the
>EPROM, bend pins 20, 23, and 26 outward slightly so that they don't plug
>into the socket.  The EPROM will plug into the socket with its pins 1, 2,
>27, and 28 hanging off the end of the socket.
>
>An E stands for a pin of the EPROM, S for a pin of the socket.
>
>Connect:
>  1E to 27E, 28E, 24S (alongside bent-out 26E)
>
>  2E to 21S (alongside bent-out 23E)
>
>  18S (alongside bent-out 20E) to bent-out 23E
>
>  22E to bent-out 20E
>
>  bent-out 26E to pin 37 of the edge connector
>
>
>
>That last connection, involving running a wire to the edge connector, is
>only necessary if you anticipate using a 16K EPROM in the controller (Disk
>BASIC, ADOS, and ADOS-3 take up only 8K; you'd probably only need this if you later
>acquire Extended ADOS-3, which requires a 16K
>27128 EPROM.)

On Thu, Mar 12, 2009 at 10:48 PM, Derek <dml_68 at yahoo.com> wrote:
> My mistake its an FD-501 controller just like it says on the label, in big lettering, in english..FD-501.. I blame 20 years of marriage for a mushy mind
>
> Arthur Flexser <flexser at fiu.edu> 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  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)
>>
>> My questions are
>> 1: Is this chip compatible with this controller?
>> 2: If yes how do I engage ADOS?
>> 3: If no what controlls will work with it?
>>
>> I do have an old FD-500 controller that has the same configuration (24 Pin ROM has Disk Extdnded Basic and 28 Pin ROM is WDC'83 Chip) But I have not tried on this controller as I wanted to get some help 1st.
>>
>> Thank you
>>
>>
>>
>>
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