Search found 319 matches

by @username@
Sun Mar 26, 2023 9:04 am
Forum: Software
Topic: Cartridge ROM mapping
Replies: 77
Views: 10843

Re: Cartridge ROM mapping

Ok guys - please point me to any ROM which has mirroring at $B800 - it's nonsense!

4K + 2K is inverted - 4K block is at $B000, 2K page is at either $A000 or $A800, or mirrored to both.
by @username@
Sun Mar 26, 2023 8:14 am
Forum: Software
Topic: Cartridge ROM mapping
Replies: 77
Views: 10843

Re: Cartridge ROM mapping

Finally got all the roms behaving as 32k roms but I can't figure out how to get the 18k Chopper game to work as a 32k rom. Tried various combinations of banks but to no avail. Is this your preferred way to get your lottery numbers :D An 18K ROM, if downloaded from here, it will be stored in this fo...
by @username@
Fri Mar 24, 2023 5:23 pm
Forum: Software
Topic: Cartridge ROM mapping
Replies: 77
Views: 10843

Re: Cartridge ROM mapping

I can sort of understand that going from one bank of 16k to 2 banks of 16k could cause some issues but why would a 6k game like planet defender need to have the first 4k swapped with the second 2k (with extra padding) to make it work as an 8k rom? That's because in the original cartridge there was ...
by @username@
Fri Mar 24, 2023 11:32 am
Forum: Software
Topic: Cartridge ROM mapping
Replies: 77
Views: 10843

Re: Cartridge ROM mapping

OK - let's think this through.

Where in memory does the original 16K ROM sit?

Why does it need to be anywhere else?

Is the earth still flat?
by @username@
Fri Mar 24, 2023 9:18 am
Forum: Software
Topic: Cartridge ROM mapping
Replies: 77
Views: 10843

Re: Cartridge ROM mapping

I can't find the original post - but here's the ZIP with all ROMS swapped. Logically, poor choice of word but hey, the ROM image is arranged as 8000 9000 A000 B000 4000 5000 6000 7000 I really don't understand why we continue to do this - as it's pretty much proven to be false in almost all cases. F...
by @username@
Wed Mar 22, 2023 10:04 am
Forum: General Laser 2001 and Salora Manager Forum
Topic: Laser 2001 & Salora Manager - official thread
Replies: 162
Views: 140646

Re: Laser 2001 & Salora Manager - official thread

The quick patch to invert the fire buttons for Astropib.bin is to switch the tests at $AE14, file offset $E15

Code: Select all

00000E15: 22 11
00000E19: 11 22
by @username@
Tue Mar 21, 2023 2:40 pm
Forum: General Laser 2001 and Salora Manager Forum
Topic: Laser 2001 & Salora Manager - official thread
Replies: 162
Views: 140646

Re: Laser 2001 & Salora Manager - official thread

Wow! Have you had a chance to test if it works yet?
by @username@
Mon Mar 20, 2023 12:24 pm
Forum: Hardware
Topic: Simple Atari-Style Joystick to Creativision adaptor
Replies: 40
Views: 9331

Re: Simple Atari-Style Joystick to Creativision adaptor

Referring to the diagram here http://www.madrigaldesign.it/forum/viewtopic.php?f=10&t=378&p=3708&hilit=joystick#p3708 If you swap PIN 1 and PIN3 - and accept that the BLUE boxes should be set - then you match up with the PIA values which are expected. The raw data is stored at memory location $18-$1...
by @username@
Sun Mar 19, 2023 7:47 pm
Forum: Hardware
Topic: Simple Atari-Style Joystick to Creativision adaptor
Replies: 40
Views: 9331

Re: Simple Atari-Style Joystick to Creativision adaptor

Not sure if this will help, but here's the breakdown of how the CV gets joystick input. BIOS reads from the PIA and inverts the value with EOR #$FF. This value is then doubled (ASL). The result is then the element of the matching value in the BIOS lookup table at $FBB1. BASIC differs by just droppin...
by @username@
Sun Mar 19, 2023 7:22 pm
Forum: General Laser 2001 and Salora Manager Forum
Topic: Salora Manager / Laser 2001 BASIC
Replies: 30
Views: 4522

Re: Salora Manager / Laser 2001 BASIC

Dunno about floppy emulation - as there's no floppy apps etc - or does someone have VisiCalc for Salora Manager?

I suspect it's not too dificult to do through the expansion port - as the existing drive controller manages to place an extra 6k ROM and a PIA there.