Changes

The Amdrum is an 8bit D/A converter (hardware) with drumkit (software), made by the British company [[Cheetah]].The drumkit was able to play 8bit sound samples.Quality of the playback was nice, considering the time and price.The samples was read from the suplied tapes.There was serveral tapes with different themes!Along with the Amdrum came a sequencing program.It was possible to copy the samples to disc, but the sequencing program had to be patched!

Quality of the playback was nice, considering the time and price. The samples were read from the suplied tapes. There were serveral tapes with different themes. Along with the Amdrum came a sequencing program. It was possible to copy the samples to disc, but the sequencing program had to be patched! Amdrum was probably Cheetahs version of the SpecDrum (As revealed on the PCB "AMSTRAD SPECDRUM"). Aside of Cheetahs own sequencer you can use some commands of the RSX ROM for [[LambdaSpeak III ROM|LambdaSpeak III]] to use the Amdrum.

No CPC emulator supports Now, thanks to Jose Leandro, the Amdrum. To hear 'Amdrum' in action hardware specialist of the Spectrum emulator Spectaculator emulates the SpecDrumspectrum, with his famous page: http://trastero.speccy.org/cosas/JL/JL.htm We can know more about this hardware.

* Uses I/O Port FFxxh (Write only), ie. only /IORQ, /WR, A15-A8 are decoded. A7..A0 are not decoded, and /RD isn't used, too.* Port usage: Write 8bit unsigned sample data to Port FFxxh. The PCBD/A converter is mono and has only one channel (onesidemixing multiple channels is to be done by software) contains .* After booting, the Amdrum software first sets port [FF80h]=80h. Emulators can use that feature to detect Amdrum software - and, after [FF80h]=80h was detected, map the whole range of ports FF00h..FFFFh to the Amdrum.* During operation, the Amdrum software uses port FFxxh. Where "xx" is garbage coming from the Amdrums keyboard scanning routine (see disassembly below). The five chipson the single-sided PCB are:

|74LS30N||Single 8-input NAND||Port decoding , /ADDR_MATCH=LOW when A8..A15 all HIGH

|74LS32N||Quad 2-input OR||Port decoding, /DAC_WRITE when /ADDR_MATCH, /IORQ, /WR all LOW

|SN74LS04N||?Hex Inverters||Charge pump circuit, used to create negative voltage rail for the op amp

|064C0PTL064CDP||Quad Operational Amplifier?||Buffer and low pass filter

|Ferranti ZN428E-8||8bit DAC||mono one-channel 8bit D/A converter (unsigned samples)

== Kits Partial dissassembly of player == exx ld a,(bc) ;get channel 1 add a,(hl) ;add channel 2 ex de,hl add a,(hl) ;add channel 3 inc hl ex de,hl inc bc add a,80h ;add bias (signed to unsigned) inc hl exx out (c),a ;out [FFxxh] with C=whatever ld b,0f6h in a,(c) ld c,a ;C=PIO Port C (keyb row, tape, psg control) xor 05h ;five ??? out (c),a ld a,0f4h in a,(66h) ld (404eh),a out (c),c ... ;something missing here? ld b,0ffh nop nop nop exx ld a,(bc) ;get channel 1 add a,(hl) ;add channel 2 ex de,hl add a,(hl) ;add channel 3 inc hl ex de,hl inc bc add a,80h ;add bias (signed to unsigned) inc hl exx out (c),a ;out [FFxxh] with xx=garbage (above PIO Port C value)

=== Afro Kit Covertape =Pictures ==

<gallery caption="Afro Kit Covertape - InstructionsAMDRUM">

Image:Afro Kit 1Amdrum_1.jpg|Afro Kit CovertapeBoxImage:Afro Kit 2Amdrum_2.jpg|Afro Kit InstructionsAmdrum inside boxImage:Afro Kit ErrataAmdrum screen shot 1.jpggif|Screen shotImage:Amdrum screen shot 2.gif|Afro Kit ErrataScreen shot

<gallery caption== Tapes =="300dpi scans by Robcfg">

</gallery> <gallery caption="Afro Kit TapeAmdrum Layout, thanks to Jose Leandro">

ImageFile:Afro Kit Tape AAmdrum - interface_delante.jpg|Afro Kit Tape side AAmdrum - Front BoxImageFile:Afro Kit Tape BAmdrum - interface_detras.jpg|Afro Kit Tape side BAmdrum - Back BoxFile:Amdrum - cara_componentes.jpg|Amdrum - ComponentsFile:Amdrum - cara_pistas.jpg|Amdrum - TracksFile:Amdrum PCB.png|Amdrum - PCB FrontFile:Amdrum Layout.png|Amdrum - Layout

=== Electro Kit Tape =Reviews / Commercials ==

<gallery caption="Electro Kit TapeCommercials for the Amdrum">

Image:Electro Kit Tape Aamdrum commercial.jpg|Electro Kit Tape side ACommercial for AmdrumImage:Electro Kit Tape BAmstrad Computer User8610028.jpg|Electro Kit Tape side BReview of the Amdrum in [[Amstrad Computer User]]Image:Amstrad Computer User8610029.jpgImage:Amstrad Computer User8610030.jpg

=== Latin Kit Amdrum Tape ===

<gallery caption="Latin Kit Amdrum Tape">

Image:Latin Kit Amdrum Tape A.jpg|Latin Kit Amdrum Tape side AImage:Latin Kit Amdrum Tape B.jpg|Latin Kit Amdrum Tape side B

== Pictures Kits ==

{| class="wikitable sortable" style="width:100%"|''Title''||''Front Covertape''||''Back Covertape''||''Tape Side A''||''Tape Side B''|-|[[Afro Kit]]||[[Image:Amdrum1Afro Kit 1.jpg|120px]]||[[Image:Amdrum2Afro Kit 2.jpg|120px]]||[[Image:Amdrum inside1Afro Kit Tape A.jpg|Component side120px]]||[[Image:Amdrum inside2Afro Kit Tape B.jpg|"AMSTRAD SPECDRUM"120px]]|-|[[Electro Kit]]||[[Image:Amdrum screen shot Electro Kit 1.gifjpg|120px]]||[[Image:Electro Kit 2.jpg|120px]]||[[Image:Electro Kit Tape A.jpg|120px]]||[[Image:Electro Kit Tape B.jpg|Screen shot120px]]|-|[[Latin Kit]]||[[Image:Amdrum screen shot Latin Kit 1.jpg|120px]]||[[Image:Latin Kit 2.gifjpg|120px]]||[[Image:Latin Kit Tape A.jpg|120px]]||[[Image:Latin Kit Tape B.jpg|120px]]|-|} <gallery caption="Afro Kit - Errata"> Image:Afro Kit Errata.jpg|Screen shotAfro Kit Errata

== Manual in PDF Other playback devices ==

* [[Media:Amdrum Manual.pdf|AMDRUM ManualDigiblaster]] (DIY) (8bit DAC on printer port)* [[Music Machine]]

== Weblinks Videos ==

[http{{#ev://www.crashonline.org.uk/27/specdrum.htm Review of the Spectrum version]youtube|0z-jGDOzwGQ|400}}

{{#ev:youtube|m6R_W9CZWGU|400}} == Other playback devices Manual == * [[Media:Amdrum Manual.pdf|Amdrum (Cheetah) Manual]] {{EN}} {{PDF}}* [https://framagit.org/offset/amdrum-acepansion Amdrum ACEpansion] on Framagit == Download == * [[Media:Amdrum.zip|Amdrum.zip]] (CDT for Emulators)* [[Media:Amdrum Afro Kit.zip|Amdrum Afro Kit.zip]] (CDT for Emulators)* [[Media:Amdrum Electro Kit.zip|Amdrum Electro Kit.zip]] (CDT for Emulators)* [[Media:Amdrum Latin Kit.zip|Amdrum Latin Kit.zip]] (CDT for Emulators) * [[Media:Amdrum (Eagle).zip|Amdrum (Eagle).zip]] (Amdrum files for Eagle)

* [http://www.cpc-power.com/index.php?page=detail&num=4294 ''Amdrum'' from CPC-Power]* [Digiblasterhttp://www.cpc-power.com/index.php?page=detail&num=4312 ''Amdrum Afro kit'' from CPC-Power]* [http://www.cpc-power.com/index.php?page=detail&num=4313 ''Amdrum Electro kit'' from CPC-Power]* [http://www.cpc-power.com/index.php?page=detail&num=4311 ''Amdrum Latin kit'' from CPC-Power]* [https://cpcrulez.fr/hardware-audio-amdrum_AA.htm ''Amdrum'' from CPCrulez]* [http://hardware.speccy.org/temp/Amstrad-Amdrum.html ''Amdrum'' from hardware.speccy.org]* [http://www.engadget.com/2005/10/28/music-thing-the-zx-spectrum-specdrum-module/ Site about the SpecDrum]* [http://www.crashonline.org.uk/27/specdrum.htm Review of the Spectrum version]* [http://www.worldofspectrum.org/hardware/feat42.html Another Spectrum review]

[[Category:HardwarePeripherals]] [[Category:PeripheralsMusic and sound]] [[Category:Music and soundManual]] [[Category:ManualVideo contents]]