Re: Apple II 256K Memory Expansion Kit

["Payton Byrd" <plbyrd@bellsouth.no.spam.net>]

"David Wilson" <mcs6502@gmail.com> wrote in message 1172405859.957884.304140@m58g2000cwm.googlegroups.com">news:1172405859.957884.304140@m58g2000cwm.googlegroups.com...
> On Feb 25, 7:06 pm, "mdj" <mdj....@gmail.com> wrote:
>> I've never looked up the exact 'technical' need for this jumper, but
>> it is necessary due to the hardware change that introduced double hi-
>> res graphics - I believe installing the jumper will inhibit 14Mhz
>> video when a graphics mode is active, which is necessary to prevent
>> hardware lockups on the revision A Apple IIe (which doesn't support
>> double resolution graphics modes)
>>
>> Someone else here probably knows the exact details of why this change
>> is necessary.
> 
> The jumper joins pin Aux-55 to pin Aux-50.
> 
> Rev A: Aux-55 = ENFIRM (when low disables ROM1 & ROM2 on motherboard)
> [*]
> Rev B: Aux-55 = FRCTXT' (when low allows 14MHz dot clock even when GR
> is high)
> 
> Both: Aux-50 = AN3 (Annunciator #3 - low after hardware RESET, set
> high by monitor firmware)
> 
> If the jumper is in place on a Rev A motherboard the system will not
> boot due to lack of ROM RESET routine. On a Rev B motherboard it will
> allow the use of Double HiRes and Double LoRes graphics.
> 
> [*] see page 178 of 030-0357-A "Apple II Reference Manual For IIe
> Only". Interestingly, the circuit diagram on pages 179-182 is of the
> Rev B motherboard.
>

Does this mean that if my board is a Rev B and I close the jumper that games like Dragon Wars will actually display in color?  Dragon Wars works fine on my Laser 128 and in an emulator, but on my unenhanced IIe it just gives a really crappy mono output that has no real definition to the image.