Thanks Jerry, reading the entire address range is a good idea so that the whole address bus and all memory is exercised. I added in clearing TIME$ first, and then printing it after the CLS. I also snuck in a BEEP before the GOTO per Josh’s suggestion.
It takes 25:07 to walk the entire address range and print out all characters >=32 😊 10 TIME$=”00:00:00” 20 CLS:PRINT TIME$;” “; 30 FOR N=0 TO 65535 40 X=PEEK(N) 50 IF X < 32 THEN 70 60 PRINT CHR$(X); 70 NEXT N 80 BEEP 90 GOTO 20 Jeff From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Jerry Davis Sent: Saturday, July 10, 2021 11:59 AM To: m...@bitchin100.com Subject: Re: [M100] Burn in program Hey, Jeff Its nothing like a real exorciser but I've been running the following code on BASIC language machines since I was a kid to see how the machine will respond and how long it will run. It's more fun to watch than anything else. 10 CLS 20 FOR N=0 TO 65535 30 X=PEEK(N) 40 IF X < 32 THEN 60 50 PRINT CHR$(X); 60 NEXT N 70 GOTO 10 Machines with memory mapped I/O don't appear to be adversely affected by reads on their ports. I've run it on machines with serial consoles (polled mode), disk drive controllers, etc. I was working on a 6809 machine running Flex09 that would crash intermittently when running a BASIC program. The above program would lock up the machine in a few minutes to a few hours. The RAM pattern test utility would crash faster than I could get a scope on it. I finally found the glitch in a RAM select line and fixed it. The RAM pattern test ran clear. Then I ran this program for a few days without a lockup and called it fixed. Jerry -------- Original message -------- From: Jeffrey Birt <bir...@soigeneris.com <mailto:bir...@soigeneris.com> > Date: 7/9/21 7:59 PM (GMT-06:00) To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: [M100] Burn in program Hi all, Burn in test? I was just wondering what sort of program you guys like to run as a burn in test of a computer you have just repaired. I modified the M100 test harness code so can run a continuous RAM test but that is not a really useful test that everyone can use as it only works with the test harness. Maybe something in BASIC that just runs some calculations, displays things on the LCD, etc. to test how stable the computer is when running for a few hours. Any favorites? Thanks, Jeff Birt -------- Original message --------From: Jeffrey Birt <bir...@soigeneris.com <mailto:bir...@soigeneris.com> > Date: 7/9/21 7:59 PM (GMT-06:00) To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: [M100] Burn in program Hi all, Burn in test? I was just wondering what sort of program you guys like to run as a burn in test of a computer you have just repaired. I modified the M100 test harness code so can run a continuous RAM test but that is not a really useful test that everyone can use as it only works with the test harness. Maybe something in BASIC that just runs some calculations, displays things on the LCD, etc. to test how stable the computer is when running for a few hours. Any favorites? Thanks,Jeff Birt
