Search found 10 matches
- Mon Dec 30, 2013 1:07 am
- Forum: Programming
- Topic: Fun with CBM arithmetics
- Replies: 33
- Views: 26197
Re: Fun with CBM arithmetics
It's not just immediately after ".75" is output. Keep reading: .75000027 .75000027 .75000028 .75000028 .75000029 .75000029 .7500006 .75000061 .75000062 .75000063 At some point, a threshold is crossed, and it starts rounding differently. Very strange. I must confess, I have never investigat...
- Fri Mar 20, 2009 6:24 pm
- Forum: Programming
- Topic: Saving Memory for ML?
- Replies: 7
- Views: 2294
According to the book Mastering the VIC-20 by A.J. Jones, E.A. Coley, and D.G.J. Cole, VICMON's memory usage can cause problems when you exit to BASIC. (This refers to memory used by VICMON, itself, not your program.) Apparently, VICMON uses a large number of zero-page locations for its own purposes...
- Mon Mar 09, 2009 11:41 pm
- Forum: Hardware and Tech
- Topic: Head Banging or Rattling on Various Commodore Disk Drives?
- Replies: 14
- Views: 5170
Wow! Thanks for all your responses. Sorry I haven't responded sooner; I've been very busy this past week. If you use openCBM, I believe you can use a command to not knock the head while formatting disks! Thanks for pointing that out -- I downloaded the source code to openCBM and took a look at it; i...
- Mon Mar 09, 2009 12:07 pm
- Forum: General Topics
- Topic: How to delete a SEQuential file ?
- Replies: 3
- Views: 1326
- Mon Mar 09, 2009 11:25 am
- Forum: General Topics
- Topic: How to delete a SEQuential file ?
- Replies: 3
- Views: 1326
Re: How to delete a SEQuential file ?
I just did a quick test of this in the VICE emulator. The command to scratch a sequential file is the same as the command to scratch a program file. If your sequential file is named "FILENAME", you just do this: OPEN 15,8,15,"S0:FILENAME" CLOSE 15 Don't append ",S" to t...
- Sun Feb 22, 2009 8:51 pm
- Forum: Hardware and Tech
- Topic: Head Banging or Rattling on Various Commodore Disk Drives?
- Replies: 14
- Views: 5170
Head Banging or Rattling on Various Commodore Disk Drives?
Anyone who has owned a 1541 disk drive knows about the loud rattling or banging noise the drive makes when it is unable to read the disk. The drive moves the head to the extreme outer edge of the disk and forces it repeatedly against an end-stop, causing the banging noise. If this is allowed to happ...
- Tue Jan 27, 2009 11:44 pm
- Forum: Programming
- Topic: Unexpanded VIC 20 Memory
- Replies: 98
- Views: 19373
now how would I go about getting the program to self execute upon loading, not having to write in SYS 828 Do you want it to run the machine-language program when you type RUN , instead of when you type SYS 828? (First you load the program, then type RUN , and then the machine-language program execu...
- Tue Jan 27, 2009 6:17 pm
- Forum: Programming
- Topic: Unexpanded VIC 20 Memory
- Replies: 98
- Views: 19373
#processor 6502 ;vic 20 processor program size 512 bytes? Your program, when assembled, is actually 22 bytes long. (DASM will produce a 24-byte file -- the first two bytes are the load address which determines where in memory the program should reside.) If you are writing a program in the cassette ...
- Fri May 30, 2008 2:44 pm
- Forum: Collecting and History
- Topic: Computer Educator Games -- Which Sets?
- Replies: 9
- Views: 3382
- Thu May 29, 2008 10:27 pm
- Forum: Collecting and History
- Topic: Computer Educator Games -- Which Sets?
- Replies: 9
- Views: 3382
Computer Educator Games -- Which Sets?
When I was a kid, I attended a school which had a VIC 20 and several of the Computer Educator books. The Computer Educator books are discussed in this thread . Basically, they are sets of cassettes, with each set containing six educational programs or games on a particular subject. There are three e...