Denial

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...

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...

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...

Just a quick follow-up: If you need to delete a file from a disk but you want to ensure the file is of a particular type (sequential, program, etc.) you can actually specify this in the filename pattern you use with the "S0" command. For example, if you want to delete a file named "FI...

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...

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...

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...

#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 ...

Thanks for your help, Eslapion and Orion70. Looking at the picture accompanying the auction for Math Book II , I can see that it does, in fact, contain VIC Mean Machine. (The cassette in the left column, middle row appears to be labelled "VIC Mean Machine Tutorial". Click "View larger...

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...