RE: Data Becker CBM-8000 hi-res graphics

From: Baltissen, GJPAA (Ruud) <>
Date: Tue, 5 Sep 2017 09:38:39 +0000
Message-ID: <>
Hallo Christian,

> The DB-Eprom-code looks like it's possible to access the screen routines with basic variables  and sys-commands ???

.eq UtilIndex		= $1F		; Utility Pointer Area
.eq StartBasVar		= $2A		; Pointer: Start of BASIC Variables
.eq ChrgetPtr		= $40		; INPUT, READ and GET ptr to save CHRGET
.eq CurBasVarName	= $42		; Current BASIC Variable Name
.eq CurBasVarData	= $44		; Pointer: Current BASIC Variable Data
.eq ForNextPtr		= $46		; Pointer: Index Variable for FOR/NEXT
.eq IrqVector		= $90
.eq StatusIO		= $96		; Kernal I/O Status Word: ST
.eq CurKeyPressed	= $97		; Current Key Pressed: 255 = No Key
.eq CharsInKeyBuf	= $9E		; No. of Chars. in Keyboard Buffer
.eq LenCurFilName	= $D1		; Length of Current File Name
.eq CurLogFileNum	= $D2		; Current Logical File Number
.eq CurSecAddress	= $D3		; Current Secondary Address
.eq CurDevNum	= $D4		; Current Device Number
.eq KeyboardBuffer	= $026F		; Keyboard Buffer

This is the list known variables accessed by the ROM. Another 74 bytes ranging from $032A to $03F8 are accessed directly as well.

The many JMP instructions at the beginning of the ROM are proof that this ROM is optimized to be used for SYS commands. 

> PS: Have you a monitor with assembler/disassembler for $A000 - like the newtim  from the 3032 ?

Sorry, no.

Met vriendelijke groet / With kind regards, Ruud Baltissen

De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de 
geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te 
nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit 
e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. 
Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige 
overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij 
overgebrachte virussen.

APG Groep N.V. is gevestigd te Heerlen en is ingeschreven in het 
handelsregister van de Kamer van Koophandel Limburg onder nummer 14099617

The information contained in this e-mail is confidential and may be privileged. 
It may be read, copied and used only by the intended recipient. 
If you have received it in error, please contact the sender immediately by 
return e-mail; please delete in this case the e-mail and do not disclose its 
contents to any person. We don't accept liability for any errors, omissions, 
delays of receipt or viruses in the contents of this message which arise as a 
result of e-mail transmission.

APG Groep N.V. is registered in the trade register of the Chamber 
of Commerce Limburg, The Netherlands, registration number: 14099617

       Message was sent through the cbm-hackers mailing list
Received on 2017-09-05 10:00:03

Archive generated by hypermail 2.2.0.