Search found 66 matches

by LoneWolf33
Fri May 22, 2020 5:49 am
Forum: Commodore Discussion
Topic: Commodore PET restoration help
Replies: 1
Views: 466

Re: Commodore PET restoration help

Hi, and welcome to the forum !

I think the # sign may indicates ROM failure: the machine stuck in the boot process due to an illegal instruction.
by LoneWolf33
Thu Apr 16, 2020 6:59 am
Forum: Commodore Discussion
Topic: Petsoft 6502 FORTH
Replies: 2
Views: 1506

Re: Petsoft 6502 FORTH

Hello, I think there's a sample program merged into this prg file during the conversion, which may explains why it doesn't run. If you check the very beginning of the file with a hex editor you'll see an explanation about the working principles of the four stroke piston engine. This doesn't seem rig...
by LoneWolf33
Sun Feb 16, 2020 1:56 am
Forum: Commodore Discussion
Topic: Commodore 64 & LCD Emulators are Up!
Replies: 2
Views: 3133

Re: Commodore 64 & LCD Emulators are Up!

And even the graphic commands are working too!
...except the char command which outputs noise at the given x,y coordinates (at least for me)
screenshot.jpg
screenshot.jpg (37.76 KiB) Viewed 3098 times
8) Cool project !
by LoneWolf33
Mon Feb 10, 2020 2:39 am
Forum: Commodore Discussion
Topic: Commodore PET POLICE! Game
Replies: 1
Views: 2433

Re: Commodore PET POLICE! Game

Here you are. :)
Police!.zip
Zipped D64 image of POLICE! PET game
(4.02 KiB) Downloaded 153 times
by LoneWolf33
Mon Jan 06, 2020 6:38 am
Forum: Commodore Discussion
Topic: Power supply question, 9VAC 50 / 60Hz
Replies: 1
Views: 1964

Re: Power supply question, 9VAC 50 / 60Hz

Hi, 9VAC is used as TOD (Time Of Day / real time clock) reference for both CIA chips. There's no hardware jumper for setting the CIA chips for 50 or 60Hz operation, this is done through register settings. 7th bit of $DC0E (for CIA#1) and $DD0E (for CIA#2). On PAL machines the 7th bit of both registe...
by LoneWolf33
Sat Sep 28, 2019 2:42 am
Forum: Commodore Discussion
Topic: The C65 #1 at the Amiwest Show 2017
Replies: 4
Views: 5075

Re: The C65 #1 at the Amiwest Show 2017

Thanks for the feedback !

I think there's very limited info available on the net about these expansion boards.
As I heard there are multiple revisions (maybe 3?) are exists in very limited numbers,
and they might not interchangeable freely between the different C65 mainboard revisions.
by LoneWolf33
Thu Sep 26, 2019 12:55 am
Forum: Commodore Discussion
Topic: PET Cassette port issue
Replies: 1
Views: 2214

Re: PET Cassette port issue

Hi, The cassette ports are handled by different chips, that could explain the symptoms. The read line of cassette port#1 (marked as "J3" on the mainboard) is connected directly (without any level conversion) to the 6522 VIA IC, while the read line of cassette port#2 (marked as "J6") is wired to the ...
by LoneWolf33
Wed Apr 10, 2019 5:16 am
Forum: Commodore Discussion
Topic: Commodore 128, 80 column mode displayed on modern monitors
Replies: 2
Views: 3074

Re: Commodore 128, 80 column mode displayed on modern monitors

Hello, I've faced the similar problem a few months back. I've bought an RGBI (CGA) to RGB adapter from gglabs ( https://gglabs.us/node/2022 ), and created a SCART adapter cable to it, so it can be used with any TV set that have RGB capable SCART input. It works nice, but doesn't looks too fancy, sin...
by LoneWolf33
Mon Jan 14, 2019 2:10 am
Forum: Commodore Discussion
Topic: What do I plug a Commodore 64 into?
Replies: 3
Views: 2576

Re: What do I plug a Commodore 64 into?

At the time C64 was designed to be used with TVs or video monitors. There are two basic ways to connect the 64 to a TV: - Baseband A/V: this requires an adapter cable between the C64's video connector and the TV / video monitor in this case the TV should have RCA or SCART A/V input(s), the adapter c...
by LoneWolf33
Fri Dec 14, 2018 3:31 am
Forum: Commodore Discussion
Topic: Commodore PET 4016 Blowing Fuses.
Replies: 1
Views: 1952

Re: Commodore PET 4016 Blowing Fuses.

Hi, This can happen when the contacts of the power switch are welded together due to the overload, so the circuit remains complete towards the primary winding of the power transformer, despite the OFF position of the switch. I'd recommend to find the root cause first, because just replacing the fuse...
by LoneWolf33
Tue Nov 27, 2018 11:37 pm
Forum: Commodore Discussion
Topic: PET 2001N 16k upgrade ram
Replies: 4
Views: 2800

Re: PET 2001N 16k upgrade ram

I've found an image at zimmers.net which describes the jumper/DIP switch configurations: http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001N/320351-6.gif I guess this fits for your PET2001N motherboard. If so, then it seems only SH2 DIP bank settings are need to be changed in order...
by LoneWolf33
Tue Nov 27, 2018 4:45 am
Forum: Commodore Discussion
Topic: PET 2001N 16k upgrade ram
Replies: 4
Views: 2800

Re: PET 2001N 16k upgrade ram

Hi,

They're pin compatible, the TMM416D-4 has a bit slower access time: 250ns vs 200ns.
IMHO the spare ICs are suitable for the RAM upgrade.
by LoneWolf33
Fri Oct 05, 2018 3:03 am
Forum: Commodore Discussion
Topic: Commodore 1902A "Vertical Collapse" problem
Replies: 4
Views: 2906

Re: Commodore 1902A "Vertical Collapse" problem

Hello, I think they're still available, or at least the IC402 (TDA2595) which was also used in TVs as well. You can make sure by checking the exact IC types on the packages and google them. IC302 is mounted adjacent to a heatsink at the centerline of main PCB, near to the rear edge of the panel, bel...
by LoneWolf33
Sun Sep 23, 2018 2:53 am
Forum: Commodore Discussion
Topic: Commodore 1902A "Vertical Collapse" problem
Replies: 4
Views: 2906

Re: Commodore 1902A "Vertical Collapse" problem

Hello, It seems the problem is probably related to one or more of the following: - missing vertical sync pulse generation, or the pulses are not reaching the vertical driver stage - vertical driver stage - missing 26 Volt power supply of the vertical driver stage - vertical deflection coil on the CR...
by LoneWolf33
Sat Sep 08, 2018 3:30 pm
Forum: Commodore Discussion
Topic: Commodore CBM 8032: Help with repair
Replies: 1
Views: 1898

Re: Commodore CBM 8032: Help with repair

Well, the picture shows only a normal startup screen :wink:
At least for me this is the only picture that appears in your post.

There might be a problem with the CRTC chip memory access.