In article <3AA49C4F.CD67094D@swbell.net>,
Rubywand  <rubywand@swbell.net> wrote:
>Dennis Jenkins writes ...
>> 
> ....
>
>
>ref. David Empson wrote ....
>>>
>
>Have you seen a complete diagram of the 128K IIe memory map?  It
>certainly helps when trying to understand all this.  Here is a rough
>version (not to scale vertically).

Nice memory map!  It inspired me to draw a similar map
explaining the memory usare of SoftCard CP/M:

 
Apple II Softcard CP/M memory usage
 
0100H    Z-80 address
$0100    6502 address
 
44K CP/M: does not use Language Card
56K CP/M: uses Language Card, bank 2 only (TPA)
60K CP/M: uses Language Card: bank 2 for TPA, bank 1 for parts of BDOS+BIOS
 
Note that the Apple II hi-res graphics screens are situated right in
the middle of the Softcard CP/M TPA.  Hi-res graphics programming on
SoftCard CP/M therefore requires special precautions.  Microsoft
GBASIC solves this by reserving an 8K large memory area, right in the
middle of the Basic interpreter, for hi-res graphics.
 
 
         Z80 addr               6502 addr
 
       ______________         ______________
0000H |CP/M zero page| $1000 |              |
      |______________|       |              |
0100H |CP/M TPA start|       |              |
      |              |       |              |
      |              |       |              |
      |              |       |              |
      |              |       |              |
      |______________|       |______________|
1000H |              | $2000 |              |
      |              |       |              |
      |              |       |  Aux Hi-res  |
      |   CP/M TPA   |       |              |
      |              |       |    page 1X   |
      |              |       |              |
      |              |       |              |
      |______________|       |______________|
3000H |              | $4000 |              |
      |              |       |              |
      |              |       |  Aux Hi-res  |
      |   CP/M TPA   |       |              |
      |              |       |    page 2X   |
      |              |       |              |
      |              |       |              |
      |______________|       |______________|
5000H |              | $6000 |              |
      |              |       |              |
      |   CP/M TPA   |       |              |
      |              |       |              |
      |              |       |              |
      |              |       |              |
            ...                    ...
      |              |       |              |
      |              |       |              |
      |              |       |              |
      |              |       |              |
      |              |       |              |
      |______________|       |              |
9400H |   44K BDOS   | $A400 |              |
      |  starts here |       |              |
      |              |       |              |
      |              |       |              |
      | CP/M 56/60K  |       |              |
      |     TPA      |       |              |
      |              |       |              |
      |              |       |              |
      |              |       |              |
      | 44K BIOS end |       |              |
AFFFH |______________| $BFFF |______________|    ______________             
B000H |              | $D000 |      ||      |   |              |
      |              |       |  LC  ||  LC  |   |              |
      |              |       |bank 1||bank 2|   |              |
      | CP/M 56/60K  |       |      ||      |   |              |
      |     TPA      |       | 60K  || Used |   |              |
      |              |       | BDOS+||  by  |   |              |
      |              |       | BIOS || CP/M |   |  Applesoft   |
      |              |       |______||______|   |              |
C000H |              | $E000 |              |   |    BASIC     |
      |              |       |              |   |              |
      |______________|       |              |   |     ROM      |
C400H |   56K BDOS   | $E400 |              |   |              |
      |  starts here |       |              |   |              |
      |              |       |   Language   |   |              |
      |              |       |              |   |              |
      |              |       |     Card     |   |              |
      |              |       |              |   |              |
      |______________|       |              |   |              |
D400H |   60K BDOS   | $F400 |              |   |              |
      |  starts here |       |              |   |..............|
D800H |              | $F800 |              |   |   Monitor    |
      | 56K BIOS end |       |              |   |     ROM      |
      |______________|       |______________|   |______________|
DFFAH | 6502 vectors | $FFFA | 6502 vectors |   | 6502 vectors |
DFFFH |______________| $FFFF |______________|   |______________|
                    _____________
E000H        $C000 | Motherboard |
                   |     I/O     |
                   |_____________|
E090H        $C090 |  Slot I/O   |
                   |  (DEVSEL)   |
                   |_____________|
E100H        $C100 |             |
                   | Slot CX ROM |
                   |   (IOSEL)   |
                   |             |
                   |_____________|
E300H        $C300 | Slot C3 ROM |
                   |   (IOSEL)   |
                   |_____________|
E400H        $C400 |             |
                   |             |
                   | Slot CX ROM |
                   |   (IOSEL)   |
                   |             |
                   |             |
                   |             |
                   |_____________|
E800H        $C800 |             |
                   |   Slot ROM  |
                   |  (IOSTROBE) |
                   |             |
                   |    shared   |
                   |   between   |
                   |    slots    |
EFFFH        $CFFF |_____________|
 
       ______________         ______________
F000H | Unused by Z80| $0000 |6502 zero page|
      |______________|       |______________|
F100H | Unused by Z80| $0100 |  6502 stack  |
      |______________|       |______________|
F200H | I/O cfg blk  | $0200 |  Keybd buff  |
      | Device driv  |       |______________|
F300H | Patch area   | $0300 |  Page 3      |
      |______________|       |______________|
F400H |              |       |              |
      |              |       |              |
      | Text/lores GR|       | Text/lores GR|
      |              |       |              |
      |              |       |    page 1    |
      |              |       |              |
      |              |       |              |
      |______________|       |______________|
F800H |              | $0800 |              |
      |              |       | Text/lores GR|
      |     CP/M     |       |              |
      |              |       |    page 2    |
      |     RWTS     |       |______________|
FC00H |              | $0C00 |              |
      |              |       |              |
      |              |       |              |
FFFFH |______________| $0FFF |______________|
 


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