Search found 797 matches

by iss
Fri Apr 05, 2019 6:31 pm
Forum: Tape and floppy disk converters
Topic: Jasmin/FTDOS to Microdisc/Sedoric
Replies: 5
Views: 339

Re: Jasmin/FTDOS to Microdisc/Sedoric

@Chema , my thoughts are pure guesses so I need first to confirm by testing that my modifications in Jasmin read/write code in FloppyBuilder are working then it will be easy to synchronize with your code. I just talked with jorodr and he really promised to try to find his Jasmin drive so there is g...
by iss
Sun Mar 31, 2019 1:43 pm
Forum: General Discussion
Topic: Thoughts about WAV tapes repository
Replies: 14
Views: 493

Re: Thoughts about WAV tapes repository

Dbug wrote:
Sun Mar 31, 2019 11:17 am
... that could be done with a simple web page with an embedded player control on it.
I really like the idea to have such on-line player! Sources can be WAV and/or TAP files.
Just for reference take a look at the Apple ][ Game Server Online - IMO - simple, nice and useful.
by iss
Sun Mar 31, 2019 12:46 am
Forum: Demos
Topic: OricExos - making the impossible
Replies: 129
Views: 13166

Re: OricExos - making the impossible

Just to wake up this thread with some good news. The parallel port transfer is working at great speed :D I've implemented a simple xfer protocol which allows to send data to 1,2 or 3 slave(s). There is 'autoexec' flag which makes possible to send just data (i.e. not executable byte array like pictur...
by iss
Sat Mar 30, 2019 11:56 pm
Forum: Technical questions
Topic: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)
Replies: 5
Views: 335

Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Great picture. Thanks, Symoon!
I think I should have such PROM somewhere, need to dig out it...
by iss
Sat Mar 30, 2019 11:51 pm
Forum: Hardware hacks and extensions
Topic: Diagnostic cartridges?
Replies: 4
Views: 299

Re: Diagnostic cartridges?

Here is the one: Diagnostic ROM and PCB by @mikeb.
Soon there will be another one ... I think ;).
by iss
Wed Mar 27, 2019 12:22 pm
Forum: Tape and floppy disk converters
Topic: Novalight - very fast tape loading
Replies: 79
Views: 4458

Re: Novalight - very fast tape loading

Cool! Congrats for the new release. I'll try to integrate it asap.
by iss
Wed Mar 27, 2019 10:22 am
Forum: Operating systems
Topic: Sedoric or not, overlay or not
Replies: 7
Views: 1243

Re: Sedoric or not, overlay or not

... and shorter version: :)

Code: Select all

    lda $c000
    inc $c000
    cmp $c000
    beq rom_activ
    ; ram active -> restore the value
    sta $c000
    jsr switch_to_rom

rom_activ
    rts
by iss
Sun Mar 24, 2019 11:37 am
Forum: Tape and floppy disk converters
Topic: Kryoflux: How to setup?
Replies: 9
Views: 392

Re: Kryoflux: How to setup?

From what I've read quick in some Kryoflux docs, I think there is NO easy way to get directly Oric-DSK image. IMO you need to use RAW MFM 300rpm format to capture 40+/80+, single/double side floppies. Having these per-track-image files we can create a parser to extract the actual data and recreate O...
by iss
Tue Mar 19, 2019 8:56 am
Forum: Technical questions
Topic: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)
Replies: 5
Views: 335

Re: Atmos ROM 1.1, 1st version (called 1.1a, checksum A65D6CED)

Thanks for the effort, Symoon! This confirms my expectations - the code related to CLOAD is exactly the same as in the Pravetz-8D ROM! I want to "investigate" when the Pravetz was copied from Oric :). You said this particular Oric is an Atmos, do you have more info about it like production date, ser...
by iss
Tue Mar 19, 2019 8:39 am
Forum: Technical questions
Topic: Oric Atmos Won't Initialise
Replies: 16
Views: 719

Re: Oric Atmos Won't Initialise

+1 that it's bad RAM chip (160Ohms between GND and +5V is low). Else everything helpful is already said. From the picture we can conclude that 12MHz generator (XT1+IC21) and ULA are working. When the logic probe arrives you can check the presence of F2 signal and event what happens on the address/da...
by iss
Mon Mar 11, 2019 7:22 pm
Forum: Technical questions
Topic: Cumulus with Wifi/SD Card?
Replies: 12
Views: 561

Re: Cumulus with Wifi/SD Card?

This is very interesting device indeed! I bought a cheap one and after month will give feedback how it works with cumulus :). If it works this will be not only timesaver for developers (and for lazy users ;)) but also will preserve the SD card connector which in cumulus is very fragile part ! ezshar...
by iss
Mon Mar 11, 2019 10:46 am
Forum: Technical questions
Topic: Oric Microdisc: Master/Slave selection
Replies: 11
Views: 824

Re: Oric Microdisc: Master/Slave selection

Attached is some info about connecting more drives. Hope it's helpful.
fdd.zip
(1002.16 KiB) Downloaded 22 times
by iss
Mon Mar 11, 2019 8:33 am
Forum: Technical questions
Topic: Replace XT1 and XT2 crystals
Replies: 11
Views: 593

Re: Replace XT1 and XT2 crystals

Any 12 MHz will work. For repair I prefer to use crystals with small footprint:
12mhz.jpg
12mhz.jpg (10.06 KiB) Viewed 560 times
BTW, many Oric's have a transistor soldered next to modulator (i.e. not only a capacitor) - this is not a repair but 'standard' feature :).
by iss
Sat Mar 09, 2019 5:03 pm
Forum: Tape and floppy disk converters
Topic: Novalight - very fast tape loading
Replies: 79
Views: 4458

Re: Novalight - very fast tape loading

For the poll : If it's not too difficult - detect and discard it during WAV generation. Here is the quick disassembly of ALC: LE7B6 := $E7B6 LE867 := $E867 LEE22 := $EE22 php sei lda $FFF9 cmp #$01 bne L02B2 lda $E4B6 cmp #$A2 bne L02A6 ldy #$09 L0293: lda L02B5,y sta $0221,y dey bpl L0293 lda #$21 ...
by iss
Thu Mar 07, 2019 5:43 pm
Forum: 6502 assembly coding
Topic: How to create random number with machine code?
Replies: 12
Views: 1428

Re: How to create random number with machine code?

Well spotted, goyo ! This algo actually generates chains with period of 256 and "will cycle through the values $00-$ff exactly once, in a scrambled order". I.e it's like doing "shuffle" but with 256 cards :). I recall that I've used this code because it was small and I needed only numbers in range 0...