Re: [Ql-Users] Split big ROMs on Q40

2017-05-30 Thread John Alexander 
Probably a good idea to use a pull up resistor (a couple of K will do) rather 
than switching up directly to 5 V


  From: Alain HAOUI 
 To: ql-us...@q-v-d.com 
 Sent: Friday, 19 May 2017, 17:20
 Subject: [Ql-Users] Split big ROMs on Q40
   
With Peter Graf's indications and some AM27C4096 ships supplied by Derek
Stewart, I realized a little circuit permitting to have a global ROM size of
1 MegaBytes on Q40 with 2 big OSes (custom SMSQ/E) ROMed together (up to
512KB each) and selectable from a case switch.

 

You can find schematic and some details from forum :

http://qlforum.co.uk/viewtopic.php?f=20
 =17547#p17547

 

Alain

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Re: [Ql-Users] Split big ROMs on Q40

2017-05-19 Thread Dave Park 
Did you use the DIP or PLCC 27C4096 for this?

On Fri, May 19, 2017 at 11:22 AM, Alain HAOUI  wrote:

> With Peter Graf's indications and some AM27C4096 ships supplied by Derek
> Stewart, I realized a little circuit permitting to have a global ROM size
> of
> 1 MegaBytes on Q40 with 2 big OSes (custom SMSQ/E) ROMed together (up to
> 512KB each) and selectable from a case switch.
>
>
>
> You can find schematic and some details from forum :
>
> http://qlforum.co.uk/viewtopic.php?f=20
>  =17547#p17547
>
>
>
> Alain
>
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> QL-Users Mailing List
>



-- 
Dave Park
Sandy Labs
d...@sinclairql.com
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