[img] BBC BASIC (65) for Acorn System
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BBC BASIC appears to have been initially developed on the Acorn System 5 as "Acorn New BASIC".
The code runs at &A000-&DFFF, workspace at &2800, PAGE=&3000, HIMEM=&A000.
Accesses the MOS via System/Atom MOS entry block. Only the System MOS, COS and DOS functions are present, all the BBC's OSWORD functions and VDU graphics functions are absent.
SBASIC1
Basic1.zip
Code
Source
16K
39K
BASIC 0/System BASIC ("Acorn New BASIC")
Source assemblable with ARM BASIC 65 to target either the Atom/System or the BBC.
SBASIC2
Basic2.zip 
Code
Source
16K
54K
BBC BASIC 2.00 for the Acorn System.
Source assembleable with ARM BASIC 65 to target either the Atom/System, the BBC, or the Commodore 64.
SBASIC3
Basic2.zip 
Code
Source
16K
54K
BBC BASIC 3.10 for the Acorn System.
Source assembleable with ARM BASIC 65 to target either the Atom/System, the BBC, or the Commodore 64.
SBASIC.ssd Disk image 50K System DOS disk image with BBC BASIC 1.00, 2.00 and 3.10
Also has a few simple tools: TINY65 tiny 6502 disassembler. Press SPACE to toggle memory dump, RETURN to scroll, A to select a new address.
You may need to run NOIRQ before running BASIC if your IRQ line is floating.

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