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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
PCBīs 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. |
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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 itīs 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.
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possible Orders:
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Apple1 RAMcard
( After revision and correction!
) |
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IMPORTANT ! PLEASE
READ TEXT IN PICTURE ABOVE !
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possible Orders:
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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 ! |
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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.
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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
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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 ) |
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possible Orders:
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Apple1 Prototypecard
( After
revision and correction! )
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The +12 Volt and -12 Volt regulation is
integrated too.
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| Frontside
/ populationside |
Backside / soldering
side |
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ACI
Size compare to expansioncards |
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◄ turn back
to the indexpage ← |
due to european laws and german court decision:
I hereby declare no responsibility to any "deep links"
resulting from the links in this page. I have no influence to
the
pages linked hereby in this page and the contents in those
pages. I therefor canīt take any kind of responsibility to
contents in the pages, where these links direct the readers
browser to nor to the contents resulting from following up links
from those pages. The reference to contents by this links is
dependent ro the status of the date when the links have
been set ( April 2013 ) and it might occur that references and
contents may change by the fact that domains may have
been discontinued from their former owners.
In such cases i canīt take any kind of responsibility to the
changed contents. this is specialy valid to banners,
advertisements or merchandising links in the targeted pages. |
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Đ copyright: Harro Walsh
2013 |
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