Re: Need card Identified, please.

["Bill Garber" <willy46pa@comcast.net>]

"HansO" <msxhans@yahoo.com> wrote in message
vKhPQilzaTxoWPJtfAzt8rHgZ23T@4ax.com">news:vKhPQilzaTxoWPJtfAzt8rHgZ23T@4ax.com...
: "Bill Garber" <willy46pa@comcast.net> wrote:
:
: >: Hi Bill;
: >:
: >: Docs and schematics are on the way to you via email.
: >:
: >: Good luck.  :-)
: >:
: >: Brian
: >
: >Got them, thank you. If anyone else needs these I will post on
: >my file server. Let me know folks.
: >
: I had a look at these docs. Quality is too low for OCR (300 dpi and better
: contrast required).
:
: But I can read then and made a (shortened) translation of the first pages:
:
: 2.1
:
: 16K EPROM-RAM card
:
: 2716 EPROM's and 6116 SRAM can be used
:
: Banks switched, soft switched, parallel to ROM and I/O area
:
: Four address ranges (see Bild 1)
:
: A:  parallel to Apple monitor,
: Independent from other ranges, can be used after Reset to replace monitor
ROM
:
: B: independent from A or together, can be switched in with softswitches
:
: C: I?O strobe address range, like firmware on Apple I/O cards. Usable for
I/O
: drivers
:
: D: only to be used when the other ranges are not convenient. When
activated the
: I/O range is switched off and no I/O is poosible except video
:
:
: 2.2
:
: Most soft switches are used from the DEV-Select address of the slot: so
the
: softswitch addresses are slot dependent
: Remark: X= slotnumber + 8 (in hex) n = slotnumber
:
: 2.2.1 Upper 2K range (A)
:
: Switched in when writing to C0x3. The memory is now available as
F800-FFFF.
: Switched off when writing to C0x0, making the Apple monitor available
again
:
: 2.2.2 Upper 12K range (B + A)
:
: Switched in when writing to C0x1.
: The memory is now available as F800-FFFF.
: Switched off when writing to C0x0, making the Apple monitor and Basic
available
: again
:
: 2.2.3 Upper 12K range (B)
:
: Switched in when writing to C0x5.
: The memory is now available as F800-FFFF.
: Switched off when writing to C0x4, making the Apple monitor and Basic
available
: again
:
: 2.2.4 I/O range (C)
:
: Switched in when writing to Cn00 - CnFF.
: No the RAM/ROM can be read and written to C800 - CF00
: Switched off when writing to CF00-CFFF
:
: 2.2.5 I/O slot range
:
: Switched in when writing to C0x7.
: Switched off when writing to CF00-CFFF
: Reqaires the USer1 - jumper on the Apple motherboard, next tot slot 7, see
Bild
: 3
:
: 2.3 Autostart
:
: The RST vector can be switched to the EPROM-RAM card by closing the
Power-on
: jumper.
: F800-FFFF is now taken from the card.
:
: 2.4 Using CMOS RAM's/EPROMS
:
: The DIL switch allows switching on the IC: ON means switched on
:
: The switches are numbered so that switch 1 = C000-C7FF, switch 2 C800 -
CFFF and
: so on.
:
: When using RAM IC's the buffered accu power can be used: solder jumpers on
the
: backside of the board, see pictures
: Loetbrucke = solder jumper, AKKU-Puffering = Accu powered, see bild 4
: Hans: http://www.hansotten.com

Thank you Hans. The card makes a lot more sense now.
This will make modifying the ROMs easier to troubleshoot
before writing to actual eproms. This is greatly appreciated.

Apple II Forever, Apple II Together
Bill @ GarberStreet Enterprizez
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