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by Mike
Fri Dec 29, 2017 5:55 am
Forum: Hardware and Tech
Topic: SD2IEC on the FE3 Cartridge
Replies: 3
Views: 84

Re: SD2IEC on the FE3 Cartridge

Have you tried other device addresses, like 9, 10 and 11? Would an upgrade to r022e be advisable? The SD2IEC only shares the power supply with the rest of the FE3, otherwise it's a completely separate module on the PCB. Especially, the SD2IEC firmware has nothing to do with the FE3 firmware (and, fo...
by Mike
Fri Dec 29, 2017 5:46 am
Forum: Programming
Topic: Where to put the code? !!!
Replies: 14
Views: 396

Re: Where to put the code? !!!

At least the code is fully relocatable, so it doesn't matter that much where you put the code. The tape buffer ($033C..$03FB, 192 bytes), as suggested by Kakemoms, is a possible candidate ... The code is only 67 bytes, so you could easily put it in the tape buffer. ... as is, for that matter, the fr...
by Mike
Thu Dec 28, 2017 8:50 am
Forum: Hardware and Tech
Topic: Ultimem BLK6
Replies: 15
Views: 413

Re: Ultimem BLK6

polluks wrote:I was thinking about a GEOS implementation but it would require a jump table at $C000 :(

I'd suppose not having room for a jump table at a certain address would be the least problem in attempting a port of GEOS.
by Mike
Wed Dec 27, 2017 5:48 am
Forum: Hardware and Tech
Topic: Vic 20 black screen :(
Replies: 13
Views: 303

Re: Vic 20 black screen :(

Checked both voltages from 2 different PSU and both measured the same voltages.. You should check the ripple on the +5V supply by setting the fluke to AC. That ripple should not exceed, say, 0.1 Volt. i tried with 2 cables and i still get no picture but with sound.. This has got me stumped.. You co...
by Mike
Tue Dec 26, 2017 3:05 am
Forum: Hardware and Tech
Topic: Vic 20 black screen :(
Replies: 13
Views: 303

Re: Vic 20 black screen :(

The Vic 20 M/B ASSY 250403 / FAB NO 251040--01 Rev D That means you've got the CR variant, which needs the PSU with the DIN plug plugged in on the right side of the computer. The video chip in the VIC-20 reacts quite sensitive to a slightly malfunctioning PSU. In that case, it tends to stop video g...
by Mike
Sun Dec 24, 2017 4:46 pm
Forum: Hardware and Tech
Topic: Fun with CBM arithmetics, Part II
Replies: 10
Views: 496

Re: Fun with CBM arithmetics, Part II

After 19 hours running full tilt... It worked perfectly. No sign of the bug. Thanks Mike. Now *that* is what I'd call a burn-in test! 8) The result for sure is pixel-for-pixel identical to the right picture ("zoom_ok.png") in the other thread. With the original BASIC ROM, the fine structu...
by Mike
Sat Dec 23, 2017 2:09 pm
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 159
Views: 3507

Re: 6561 Die Shot Reversing Explorations

Radical Brad wrote:I wonder if any of the original 6560 design files might still exist someplace?
A roll of long lost vellum paper collecting dust in some old warehouse?

See here: Possible MOS tech docs find, just a few days ago.
by Mike
Sat Dec 23, 2017 5:20 am
Forum: Programming
Topic: MINIGRAFIK batch processing suite
Replies: 50
Views: 17486

Re: MINIGRAFIK batch processing suite

I was not alone in having the need to solve the aforementioned issue... ;) Lemon 64: Tool To Recolour Characters I was hoping that CHARpad would do this, but it doesn't. Anyone know of a tool to recolour multicolor CHARSETS ? ie Transparent Char Colour MC 1 MC 2 I want to change one of these attribu...
by Mike
Fri Dec 22, 2017 9:19 am
Forum: Collecting and History
Topic: I think I might have found an undocumented VIC cartridge...
Replies: 60
Views: 13585

Re: I think I might have found an undocumented VIC cartridge...

ral-clan, This thread here is, IMO, one of the great moments in Denial. :D I fondly remember what was involved in this - your find and doing the dump of the cartridge, some careful analysis of the code leading to a whole documentation of all commands, even a scan of the manual re-appeared some time ...
by Mike
Fri Dec 22, 2017 3:58 am
Forum: Emulation and Cross Development
Topic: UDG on a Vic20 + 3K?
Replies: 8
Views: 222

Re: UDG on a Vic20 + 3K?

How do I fix the char memory and screen memory at the right places for the 6k solution? You'll have to assign the UDGs a dedicated static area in the *.cfg file, and link a prepared 512 byte file with the character definitions. Alternatively, just assign the program/data the restricted range $0400[...
by Mike
Fri Dec 22, 2017 2:49 am
Forum: Emulation and Cross Development
Topic: UDG on a Vic20 + 3K?
Replies: 8
Views: 222

Re: UDG on a Vic20 + 3K?

Regardless the +3K RAM expansion, the UDGs can still only be placed in the internal RAM ($1000..$1FFF, if we disregard $0000..$03FF), three main options (I suppose you stick with the standard screen size of 22x23 chars and single-height 8x8 pixel character definitions): 1. screen at $1E00 , charset ...
by Mike
Wed Dec 20, 2017 4:13 pm
Forum: Hardware and Tech
Topic: Ultimem BLK6
Replies: 15
Views: 413

Re: Ultimem BLK6

Of course it's not all that sensible to modify the mainboard if the intended result could also be achieved by an external solution. That being said, my proposal in the other thread would have been 'nice to have', but on the other hand it had that smell of: "now that I've got the solution, I onl...
by Mike
Wed Dec 20, 2017 2:28 pm
Forum: Hardware and Tech
Topic: Ultimem BLK6
Replies: 15
Views: 413

Re: Ultimem BLK6

it would be so nice if you could map the e000-ffff block to ram as you can on c64.... but you cant :( It's not as if I hadn't entertained that idea once in a while - see the thread " WIP(?): A proposal for a VIC-20 with 60K RAM ". That would also allow for RAM "under" the charac...
by Mike
Wed Dec 20, 2017 12:51 pm
Forum: Hardware and Tech
Topic: Ultimem BLK6
Replies: 15
Views: 413

Re: Ultimem BLK6

or more precisely the 6502 CPU In the C64, the PLA is responsible for the RAM/ROM mapping. That the mapping is (in part) controlled by the I/O port of the 6510 is more of an insignificant detail here. The 'chip set' of the VIC-20 enforces a fixed mapping, how the internal ROMs (BASIC in BLK6 and KE...
by Mike
Wed Dec 20, 2017 12:01 pm
Forum: Programming
Topic: Printing float numbers in Hex using USR()
Replies: 5
Views: 280

Re: Printing float numbers in Hex using USR()

Sorry for wasting your time with my ignorance. I'm done posting here. Sometimes fair criticism gets down the wrong throat, me guesses. Two people (wimoos and me) independently told you that there's something wrong with what you coded, and you should be able to cope with that. I suppose you could be...

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