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- Fri Apr 19, 2024 7:58 am
- Forum: Hardware and Tech
- Topic: Switchless JiffyDOS kernal switcher?
- Replies: 6
- Views: 2563
- Wed Aug 30, 2023 7:28 am
- Forum: Hardware and Tech
- Topic: VIA address decoding
- Replies: 3
- Views: 3467
Re: VIA address decoding
VIC20 does not have fully decoded addresses for chip selection, so some chips overlaps can be done. The overlaps become bus conflicts if a READ cycle is executed, but it can be used to WRITE the same value into the same register of both VIAs in the same CPU cycle, it can be useful for "raster r...
- Wed Aug 30, 2023 7:11 am
- Forum: Buy, Sell, and Trade
- Topic: SMART RAM: a versatile RAM expansion cartridge up to +37k
- Replies: 15
- Views: 6899
Re: SMART RAM: a versatile RAM expansion cartridge up to +37k
Yes,
SMART RAM is still available!
nefaurora: you have a private message....
SMART RAM is still available!
nefaurora: you have a private message....
- Fri Aug 04, 2023 9:32 am
- Forum: Buy, Sell, and Trade
- Topic: FS: Behr-Bonz Vic-20 Multi-cart, 127 games, with shells.
- Replies: 27
- Views: 12245
Re: FS: Behr-Bonz Vic-20 Multi-cart, 127 games, with shells.
A couple of years ago I developed the HW of a new multicart which uses a different approach to fill the EPROM and this means that many more files can be inserted (simultaneously even PAL/NTSC versions...). http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=9926 multicart.jpg The prototy...
- Sun Jan 22, 2023 4:46 am
- Forum: General Topics
- Topic: Italian, German, and French language help needed
- Replies: 18
- Views: 1759
Re: Italian, German, and French language help needed
Italian: BASIC (like BASIC language) - this is called BASIC, its a name ASSEMBLY - I'd not translate this either ("Assembler"). Also "Assembly" and "Machine Language" aren't the same thing :) "machine language"="linguaggio macchina" CONTROLLERS (like...
- Wed May 04, 2022 11:26 am
- Forum: Hardware and Tech
- Topic: Diagnostic Tools for the Vic-20
- Replies: 18
- Views: 2930
Re: Diagnostic Tools for the Vic-20
Why the old PAL & NTSC distinct Diagnostic tool version and not my pal/ntsc cable free hacked version of Diagnostic Tool? and why not my new DeadTest version with additional Keyboard and Video/Audio tests too? It's just a misunderstanding: "OLD" as "improved mbla000 CLASSIC"...
- Wed May 04, 2022 7:36 am
- Forum: Hardware and Tech
- Topic: Diagnostic Tools for the Vic-20
- Replies: 18
- Views: 2930
Re: Diagnostic Tools for the Vic-20
Now I'm thinking about a test set composed by the classic test-cables and a new diagnostic card. This new diagnostic board integrates 3 tools: 1) classic DEAD TEST program ( the version improved by nbla000 ) to test quickly without opening the VIC20 case 2) classic DIAGNOSTIC program ( the version i...
- Tue Apr 26, 2022 1:20 am
- Forum: Hardware and Tech
- Topic: Hot VIC
- Replies: 11
- Views: 1146
Re: Hot VIC
I tried to select the DC-DC converters CC CV but unfortunately all those I have seen on sale are not suitable because to measure the current they interrupt the ground line input-output with a small shunt resistor, while in our case the point of ground is unique in common between input and output. No...
- Sat Apr 23, 2022 4:09 am
- Forum: Hardware and Tech
- Topic: Hot VIC
- Replies: 11
- Views: 1146
Re: Hot VIC
The heat inside the old type of board can be drastically reduced by using a DC-DC converter in place of the 5V linear regulator (I suggest the DC-DC converter type with toroidal core). The heat inside is also generated by the diode rectifier bridge, but if the DC-DC converter is used the current on ...
- Mon Mar 28, 2022 10:55 am
- Forum: Hardware and Tech
- Topic: Diagnostic Tools for the Vic-20
- Replies: 18
- Views: 2930
- Mon Mar 28, 2022 9:55 am
- Forum: Hardware and Tech
- Topic: Diagnostic Tools for the Vic-20
- Replies: 18
- Views: 2930
Re: Diagnostic Tools for the Vic-20
Very interesting! C16 and PLUS4 have the Kernal rom always on socket so the "DIAG264" was created (an alternative ROM kernal that test the computer: diagnostic for '264 machines). Unfortunately in the VIC20 the rom of the kernal is very often soldered, so the "DIAG20" kernal rom ...
- Thu Feb 24, 2022 8:41 am
- Forum: Programming
- Topic: wAxpander with wAx2
- Replies: 71
- Views: 16530
Re: wAxpander with wAx2
for the hole: If a pre-hole (1 .... 1.5 mm) is made that centers the 3 ..... 3.5 mm drill, this can be done without risk of damage to the case. A possible error in the positioning of the hole generates a very limited angular error on 40 mm of the stem, not much precision is needed A "case"...
- Thu Feb 24, 2022 8:13 am
- Forum: Programming
- Topic: wAxpander with wAx2
- Replies: 71
- Views: 16530
Re: wAxpander with wAx2
IMG_5137.jpg Maybe a better button can be implemented .... A 40 mm long push button can be placed on the jollycart and a 3 ---- 3.3 mm hole can be drilled on the thickness of the cartridge case, but 40mm doesn't exist! A 40mm long push button can be made from a standard 10 ..... 17mm by extending i...
- Thu Feb 24, 2022 8:03 am
- Forum: Hardware and Tech
- Topic: The DIY cartridge: JOLLY CARTRIDGE!
- Replies: 105
- Views: 12915
Re: The DIY cartridge: JOLLY CARTRIDGE!
Wonderful, thanks for sharing it!doug_in_nc wrote: ↑Tue Feb 22, 2022 7:24 am I finally got round to refining and printing my 3d printed design for a Jolly Cart case, so I thought it might be useful to other owners. (...)
- Fri Feb 18, 2022 4:57 am
- Forum: Hardware and Tech
- Topic: The DIY cartridge: JOLLY CARTRIDGE!
- Replies: 105
- Views: 12915