Search found 408 matches

by MCes
Wed Aug 30, 2023 7:28 am
Forum: Hardware and Tech
Topic: VIA address decoding
Replies: 3
Views: 2044

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...
by MCes
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: 4773

Re: SMART RAM: a versatile RAM expansion cartridge up to +37k

Yes,
SMART RAM is still available!

nefaurora: you have a private message....
by MCes
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: 9272

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...
by MCes
Sun Jan 22, 2023 4:46 am
Forum: General Topics
Topic: Italian, German, and French language help needed
Replies: 18
Views: 1575

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...
by MCes
Wed May 04, 2022 11:26 am
Forum: Hardware and Tech
Topic: Diagnostic Tools for the Vic-20
Replies: 18
Views: 2658

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"...
by MCes
Wed May 04, 2022 7:36 am
Forum: Hardware and Tech
Topic: Diagnostic Tools for the Vic-20
Replies: 18
Views: 2658

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...
by MCes
Tue Apr 26, 2022 1:20 am
Forum: Hardware and Tech
Topic: Hot VIC
Replies: 11
Views: 1061

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...
by MCes
Sat Apr 23, 2022 4:09 am
Forum: Hardware and Tech
Topic: Hot VIC
Replies: 11
Views: 1061

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 ...
by MCes
Mon Mar 28, 2022 10:55 am
Forum: Hardware and Tech
Topic: Diagnostic Tools for the Vic-20
Replies: 18
Views: 2658

Re: Diagnostic Tools for the Vic-20

nbla000 wrote: Mon Mar 28, 2022 10:35 am Very Interesting info... but this hardware riquires someone is able to program a CPLD, unfortunately I'm not :roll:
Fortunately I can... :lol: :P

Another project into the "have to do" list... :wink:
by MCes
Mon Mar 28, 2022 9:55 am
Forum: Hardware and Tech
Topic: Diagnostic Tools for the Vic-20
Replies: 18
Views: 2658

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 ...
by MCes
Thu Feb 24, 2022 8:41 am
Forum: Programming
Topic: wAxpander with wAx2
Replies: 71
Views: 12182

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"...
by MCes
Thu Feb 24, 2022 8:13 am
Forum: Programming
Topic: wAxpander with wAx2
Replies: 71
Views: 12182

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...
by MCes
Thu Feb 24, 2022 8:03 am
Forum: Hardware and Tech
Topic: The DIY cartridge: JOLLY CARTRIDGE!
Replies: 105
Views: 7037

Re: The DIY cartridge: JOLLY CARTRIDGE!

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. (...)
Wonderful, thanks for sharing it!
by MCes
Fri Feb 18, 2022 4:57 am
Forum: Hardware and Tech
Topic: The DIY cartridge: JOLLY CARTRIDGE!
Replies: 105
Views: 7037

Re: The DIY cartridge: JOLLY CARTRIDGE!

chysn wrote: Wed Feb 16, 2022 7:57 pm Got my Jollies! Thanks!
Thanks to you,
I hope you will have a lot of fun with DreamCart too!
by MCes
Tue Feb 08, 2022 12:00 pm
Forum: Programming
Topic: wAxpander with wAx2
Replies: 71
Views: 12182

Re: wAxpander with wAx2