Atari 130XE Uživatelský manuál stáhnout pdf (Strana 32)

3 Debugger and DOS

If you would like to access the RAM under the OS ROM, enter

PB<FE

to set bit 0 of

PORTB

to 0. With

PB<E3

access to the ﬁrst bank of the RAM extension in Atari 130 XE is

activated. The content of

PORTB

at the time of the freeze can be displayed using

D D301

–

provided it was not changed already using C D301<value.

The access to the frozen PIA registers ($D3xx) is subject to a special handling in the

freezer. Normally, the values of the PIA registers are repeated every 4 bytes in the Atari.

In the debugger, 8 bytes are displayed instead.

$D300, $D301

are the normal registers PORTA and PORTB

$D302, $D303

contain the data direction registers for

PORTA

and

PORTB

. They are normally

accessible via PORTA resp. PORTB if bit 2 of PACTL / PBCTL is set to 0.

$D304, $D305

contain the values of

PACTL

resp.

PBCTL

which are normally accessible via the

address $D302 resp. $D303.

$D306, $D307

are unused

3.2.6 Display display list

The

command prints the ANTIC menmonics as described in the ANTIC data sheet,

starting at the speciﬁed memory address.

BLK x x blank lines

CHR x Text mode x

MAP x Bitmap mode x

JMP adr Jump to given address

JVB adr Wait for vertical blank, then jump to given address

Right to the mnemonic the following options are printed, if present:

LMS adr Load memory scan counter (pointer to the current screen memory address)

H Horizontal scrolling enabled

V Vertical scrolling enabled

I Trigger display list interrupt (DLI)

3.2.7 Search in memory

The search command can be used in various manners. Use

/start/value1,value2...

to search the speciﬁed byte sequence starting at the speciﬁed start address. At the ﬁrst

occurrence of the byte sequence, the search stops and prints the address. The internal

address counter is set to the found address, so you can disassemble from that address

immediately using the L command. The search can be resumed with the / command.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 63 64

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