Search found 1331 matches
- Sat Dec 09, 2023 1:58 am
- Forum: General Topics
- Topic: Bugs & Quirks in the VIC-20 BASIC & KERNAL ROMs
- Replies: 4
- Views: 2792
Re: Bugs & Quirks in the VIC-20 BASIC & KERNAL ROMs
I was just working with the keyboard decode tables this morning, and I was wondering about the purpose of this whole page of NOPs. And not necessarily a bug, but they’re not being very elegant about setting the decode table index, either. I've recently disassembled the VIC-1001 ROM in this area, I'...
- Fri Dec 08, 2023 3:32 pm
- Forum: General Topics
- Topic: Bugs & Quirks in the VIC-20 BASIC & KERNAL ROMs
- Replies: 4
- Views: 2792
Bugs & Quirks in the VIC-20 BASIC & KERNAL ROMs
The firmware in the VIC-20 is a remarkable feat of engineering (given the primitive development and debugging tools available at the time it was written). While compared to some other computers of the era it is relatively bug-free there are a number of issues present. BASIC VERIFY Result When the VE...
- Sat Dec 02, 2023 1:21 pm
- Forum: Programming
- Topic: Help needed for "Frames Per Second Counter / Monitor"
- Replies: 5
- Views: 2638
Re: Help needed for "Frames Per Second Counter / Monitor"
My question is, is this interrupt routine correct? Can the jump to the $EABF routine be implemented differently? That depends on what you want happen during an interrupt. The KERNAL routine is this https://eden.mose.org.uk/gitweb/?p=rom-reverse.git;a=blob;f=src/basic_kernal.asm;hb=HEAD#l10602 it's ...
- Sun Nov 26, 2023 2:29 am
- Forum: Programming
- Topic: "Ultimate Expansion" - new firmware for FE3
- Replies: 59
- Views: 9929
Re: "Ultimate Expansion" - new firmware for FE3
A new release (1.7) with another new feature. I've added a Minipaint image slideshow viewer to the "FE3 Utilities" menu (F5). Each file is displayed in turn, key press/joystick moves to the next image. Press [STOP] to exit.
- Tue Nov 21, 2023 1:21 pm
- Forum: Emulation and Cross Development
- Topic: Vic20 code editors / IDE for Mac
- Replies: 5
- Views: 3164
Re: Vic20 code editors / IDE for Mac
- Mon Nov 20, 2023 2:22 pm
- Forum: Hardware and Tech
- Topic: User Port PCB?
- Replies: 3
- Views: 2523
- Wed Nov 15, 2023 2:50 pm
- Forum: Collecting and History
- Topic: De-yellowing your VIC-20 case
- Replies: 47
- Views: 17812
Re: De-yellowing your VIC-20 case
I'm pretty sure I've ordered parts from this guyWayne / Art Ravers wrote: ↑Wed Nov 15, 2023 2:24 pm I have already acquired a Kernal Rom Chip, just need to get a 6502 now - Any suggestions on Places that are reliable please ?
https://www.ebay.co.uk/itm/325396424917
- Sat Oct 28, 2023 2:55 am
- Forum: Hardware and Tech
- Topic: 6560 Maximum Memory
- Replies: 7
- Views: 2523
Re: 6560 Maximum Memory
Back in the 80's I made an internal 3K expansion module that fitted into the socketDrVeryEvil wrote: ↑Wed Oct 25, 2023 2:38 pm A quick tip, all the data and address line are accessible from the character ROM chip.
https://www.sleepingelephant.com/ipw-we ... php?t=7016
- Thu Oct 26, 2023 10:35 am
- Forum: Programming
- Topic: "Ultimate Expansion" - new firmware for FE3
- Replies: 59
- Views: 9929
Re: "Ultimate Expansion" - new firmware for FE3
I've updated the user guide I wrote to include all the new features
https://eden.mose.org.uk/download/FE3%2 ... 0Guide.pdf
https://eden.mose.org.uk/download/FE3%2 ... 0Guide.pdf
- Thu Oct 26, 2023 4:46 am
- Forum: Programming
- Topic: File Command Errors
- Replies: 31
- Views: 6111
- Mon Oct 23, 2023 12:50 am
- Forum: Programming
- Topic: "Ultimate Expansion" - new firmware for FE3
- Replies: 59
- Views: 9929
Re: "Ultimate Expansion" - new firmware for FE3
A new release (1.6) with another new feature. I've added a simple directory/image navigator (F2 from the main menu). This allows you to easily traverse a directory tree on the SD card, including entering images, and then boot to BASIC without needing loader files. Download link: https://eden.mose.or...
- Thu Oct 19, 2023 1:29 am
- Forum: Games
- Topic: Mega Vault by Imagine .PRG file
- Replies: 9
- Views: 3085
Re: Mega Vault by Imagine .PRG file
I don't think it's possible to create a single .PRG file for this game. It contains several files that all load to the same address (except the last one) (cbm) file 0:* LOADER (SYS850): PRG, size=69 bytes, start=$0352 STAGE1: PRG, size=4098 bytes, start=$1000 STAGE2: PRG, size=1026 bytes, start=$100...
- Wed Oct 18, 2023 1:01 pm
- Forum: General Topics
- Topic: VIC-1001 main board
- Replies: 9
- Views: 2883
- Mon Oct 09, 2023 5:47 am
- Forum: General Topics
- Topic: VIC-1001 main board
- Replies: 9
- Views: 2883
Re: VIC-1001 main board
Could you attach a photo?
- Thu Oct 05, 2023 1:21 am
- Forum: Programming
- Topic: Assembly: Detect when result rolls over from 255 to 0
- Replies: 6
- Views: 2211
Re: Assembly: Detect when result rolls over from 255 to 0
When adding to the accumulator using ADC, how can I detect whether a zero roll-over has taken place? That's precisely what the carry bit is for, so your original code should have been bcc inc_src_hi_ptr_done There are a number of implementations of block moves in the 6502.org code repository, http:...