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Bug65
Bug65

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At line 159 added 19 lines
! BUG/65 patch from OSS Newsletter October 1984:
When BUG gets control as the result of a BRK instruction being executed, it actually checks to see it the BRK instruction is one which it placed (as a result of a "G" command). If not, it assumes that it is a user breakpoint, to be handled by a user routine! Guess what? Most of us don't go around adding user BRK handlers to Atari’s OS, so the machine goes off into never-never-land.\\
\\
Quick hix (again, not hor the faint of heart): After loading BUG/65 from CP, perform the following actions:\\
\\
1. Display the contents of location $2E7 (LOMEM).\\
2. Use the "H" command to add $17EE to those contents. (Example: if $2E7 contains 2200, use "H 2200 17EE” to find the sum.) Call this value ADDSUM.\\
3. Display the memory at ADDSUM (via the "D" command. You should see the following bytes (if not, stop now): 39EE E9 02 4D . . . ("39EE" is arbitrary-value of ADDSUM if LOMEM is at $2200.)\\
4. Use BUG/65 commands as follows:\\
\\
Z 600\\
LDA #B0\\
STA addsum (use actual address instead of name!)\\
LDA #1E\\
STA addsum+1 (again, use an actual address)\\
BRK (hit the BREAK key to exit miniassembler)\\
G 600\\
\\
If you did everything correctly, BUG/65 should allow a "USER RUN" and then print a breakpoint message for the BRK at $60A. If it didn’t work, you may have an already-fixed version of BUG/65, so ignore all this.\\
This page (revision-26) was last changed on 03-Feb-2023 15:21 by Roland B. Wassenberg  Top