APPLEBOX 		  
 

 
     Apple1 Expansion cards ( preview ! cards still under development ! )
 

  This page is updated every 2 or 3 days !

 

 
 
possible Orders:        6

 

   Apple1 slotexpansioncard ( After revision and correction! )
   some minor corrections still possible...

   Important change : additional +5 Volt stabilisation and external powersupply added !
  this change will not be on my own testing boards - but it will be on the
  PCB´s ordered and at least one of them will be tested before shipping.
  Reason: If RAMcard is completely populated and ROMcard inserted,  the remaining rest of power from the mainboard
   ( from the 3 Amperes on board only 0, 6 Amperes left ) may bear danger for the onboard powersupply.
 
 
      additional remarks:
The Apple 1 Slotexpansion
is designed with additional
stabilisation for the -12 Volt
and the + 12 Volt branch.

In fact at the slotconnector is only the unregulated voltage
for these both branches availiable and the card is designed for both options:

1. using the unregulated from the connector and
putting it to a regulation
and then delivering it to the additional slots as regulated voltage

or:

2. not using the power from the connector but instead using two plugs and inserting there at each plug 12 Volt AC voltage and then
getting after the reticifers DC voltage which is regulated and delivered to the aditional slots without producing load to the mainboard and it´s powersource.

In both cases there is enough space left to apply a heatsink to the regulatorchips.


the unused area above
might be used for additional regulation of - 5 Volt.
 
 
  Please recognize: The scans below from the testing cards differ from those,
                                that will be ordered from customers in several points:
  1. The slotpadcontacts on the testingboards are NOT goldplated. The cards ordered by customers will be goldplated !
  2. The +5 Volt branch as displayed above is not on the testing boards - but it will be on those ordered from customers !
  3. The holes drilled for fitting of the slots will be enlarged so that the EDAC connectors 305-044-521-201
      or those from CHINCH will fit without preparation.
 
 
 
     
     
   
 
 
possible Orders: 
   4		  Apple1 RAMcard  ( After revision and correction! )
 
 
   

 
 

   IMPORTANT ! PLEASE READ TEXT IN PICTURE ABOVE !


  
 
 
     
     
     
 
 
possible Orders: 
    4		  Apple1 ROMcard  ( After revision and correction! )
  This card is corrected, but the size must be optimized later - before passing the data to
    PCB manufacturer - the card must become 2 cm less high and at least 2 or 3 cm less long !
 
    This Card is designed for different kinds of usage:
  as ROM Card for 2708 or 2716 Eproms
  - but also for use with 6116 Static RAM.
  If the 6116 is used, the user may use a "backup-accumulator" on board as battery to keep the contant of the static RAm nonviolatile for a couple of days.
  That feature is switched "on" or "off"by a slideswitch on top of the card.

  This will enable the user to first use the Card with static RAM for development of the software, that is determined to be used in the Eprom.
  Then - after that software has been tested - the card can be used with Eproms.

  The design of the card contains microswitches and permits the adressrange of each socket to be chosen with four 4pol-DIL-microswitches
  - so each Eprom may use its own selected adressrange.

  Each socket permits to be free selectable with either 2708 / 2716 or 6116 by a socket configuration plug.
 
  I have also integrated the ability to program the Eproms with integrated ability to produce the needed programmingvoltage on the card.
  The needed programmingvoltage can be switched "on" or "off" by Jumper at JP1 - and if it is switched on - it will be controlled bx software
  on the line"T" and the Read/Write-signal. The programmingvoltage of 12,5 Volt, 21 Volt, 25 Volt or 26 Volt will be selected by a jumper at JP2.
 
  The +12 Volt and -12 Volt regulation is integrated too.
 
                                


  


 
  Please recognize: The scans below from the testing cards differ from those,
                                that will be ordered from customers in several points:
  1. The slotpadcontacts on the testingboards are NOT goldplated.
      The cards ordered by customers will be goldplated !		  
 new layout with far less hight and much better balance
 by placing the the accumulator above the slot		  former Layout ( too high )
 with less good layout ( bad balance due to outside placement of accumulator )

 
   
   
  Preview of the manual

  
   
   
   
   
   
   
   
   
   
 
 
possible Orders: 
    6		  Apple1 Prototypecard  ( After revision and correction! )
 
 
 

   The +12 Volt and -12 Volt regulation is integrated too.

 		  
Frontside / populationside  Backside / soldering side
 

 



 ACI  Size compare to expansioncards

  
 
   
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© copyright: Harro Walsh 2013