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Question about a note in Merlin8 Manual

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  Question about a note in Merlin8 Manual ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-08 17:01 -0600
    Re: Question about a note in Merlin8 Manual ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-08 17:48 -0600
      Re: Question about a note in Merlin8 Manual gids.rs@sasktel.net - 2016-01-09 08:25 -0800
        Re: Question about a note in Merlin8 Manual gids.rs@sasktel.net - 2016-01-09 08:28 -0800
          Re: Question about a note in Merlin8 Manual gids.rs@sasktel.net - 2016-01-09 08:32 -0800
            Re: Question about a note in Merlin8 Manual ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-09 10:48 -0600
              Re: Question about a note in Merlin8 Manual gids.rs@sasktel.net - 2016-01-09 12:33 -0800
                Re: Question about a note in Merlin8 Manual ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-09 14:44 -0600

#2070 — Question about a note in Merlin8 Manual

I came across an item while perusing the Merlin 8 manual and I wanted 
to ask some questions about it.

I'm using Merlin 8 on a IIGS with a 1MB expansion.

Here's the note:

<quote>
APPLE IIGS USERS: Method B (which is assembling then running the 
program from the monitor) cannot be used to test programs that call 
Applesoft or Monitor routines in the address range $D000-$FFFF (such as 
DEMO PROGRAM #1 that calls the BELL routine at $FBDD). This is because 
on the GS, these routines are actually located in bank $FF of memory, 
while the routine you're testing, at that point, is in bank $00. When 
your routine calls the Applesoft or Monitor routine, it will not jump 
to the proper bank, and the results are unpredicatable.
</quote>

The manual then suggests booting into PRODOS to BLOAD or BRUN the object file.

I realize that the note is true. (I can confirm!) But it has me 
curious. I've heard of people transferring programs from one bank to 
another in order to free up space in one bank or another and wondered 
if someone like this were possible in this case. Could I move a program 
from bank $00 to $FF or even $01 to get access to the monitor routines?

Cheers,

m

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#2071

On 2016-01-08 23:01:23 +0000, ultramagnus_tcv said:

> I realize that the note is true. (I can confirm!) But it has me 
> curious. I've heard of people transferring programs from one bank to 
> another in order to free up space in one bank or another and wondered 
> if someone like this were possible in this case. Could I move a program 
> from bank $00 to $FF or even $01 to get access to the monitor routines?

Just been poking at this a little bit.

I noticed that I can go to the monitor in Merlin, then execute:

*01/

That puts me in Bank 01. I see the program there and can run it without 
problem.

Although I don't know why! :-)

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#2075

On Friday, January 8, 2016 at 10:08:36 PM UTC-6, ultramagnus_tcv wrote:
> On 2016-01-08 23:01:23 +0000, ultramagnus_tcv said:
> 
> > I realize that the note is true. (I can confirm!) But it has me 
> > curious. I've heard of people transferring programs from one bank to 
> > another in order to free up space in one bank or another and wondered 
> > if someone like this were possible in this case. Could I move a program 
> > from bank $00 to $FF or even $01 to get access to the monitor routines?
> 
> Just been poking at this a little bit.
> 
> I noticed that I can go to the monitor in Merlin, then execute:
> 
> *01/
> 
> That puts me in Bank 01. I see the program there and can run it without 
> problem.
> 
> Although I don't know why! :-)


That is probably because Merlin is running with the Prodos part of the LC enabled and not ROM and any calls above $D000 are calling Prodos.

Try using this at the beginning of your test program.

 LDA $D000
 STA $D7
 STA $C082
.
.
.
and this at the end

 LDA $C08B

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#2076

 Try using this at the beginning of your test program.
 
  LDA $D000
  STA $D7
  STA $C082   ; turns on ROM
 .
 .
 .
 and this at the end
 
  LDA $C08B  ; re-enable LC bank 1
  LDA $C08B
  LDA $D000
  CMP $D7
  BEQ FINI
  LDA $C083  ; re-enable LC bank 2
  LDA $C083
FINI 


This should return the LC to its original state

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#2077

Sorry, missed a line.


Try using this at the beginning of your test program.
 
 LDA $D000
 STA $D7
 STA $C082   ; turns on ROM
.
.
.
and this at the end
 
 LDA $D000
 CMP $D7
 BEQ FINI
 LDA $C08B  ; re-enable LC bank 1
 LDA $C08B
 LDA $D000
 CMP $D7
 BEQ FINI
 LDA $C083  ; re-enable LC bank 2
 LDA $C083
FINI 

 
 This should return the LC to its original state

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#2078

LC?

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#2080

On Saturday, January 9, 2016 at 10:48:21 AM UTC-6, ultramagnus_tcv wrote:
> LC?


Language Card.  Probably called that because Integer Basic or Applesoft usually resides there.

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#2081

On 2016-01-09 20:33:17 +0000, gids.rs@sasktel.net said:

> Language Card.  Probably called that because Integer Basic or Applesoft 
> usually resides there.

Ah! Thanks again. I will try those routines you sent. Thank you. 

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