Amdrum - Revision history

Phi2x: /* Manual */

2025-04-10T01:13:07Z

‎Manual

Polluks: clean-up

2022-09-28T11:35:57Z

clean-up

Pianoplonker at 18:33, 28 April 2021

2021-04-28T18:33:45Z

Cpcmaniaco: /* Pictures */

2020-09-18T10:44:42Z

‎Pictures

Cpcmaniaco: /* Weblinks */

2020-09-18T10:38:26Z

‎Weblinks

Cpcmaniaco: /* Links */

2020-09-18T10:36:57Z

‎Links

TFM at 11:41, 26 April 2020

2020-04-26T11:41:36Z

TFM: software note added

2020-04-26T11:41:07Z

software note added

Cpcmaniaco: /* Manual */

2016-04-09T01:03:37Z

‎Manual

Cpcmaniaco: /* Manual */

2016-04-09T01:02:42Z

‎Manual

← Older revision		Revision as of 01:13, 10 April 2025
Line 166:		Line 166:

	* [[Media:Amdrum Manual.pdf\|Amdrum (Cheetah) Manual]] {{EN}} {{PDF}}		* [[Media:Amdrum Manual.pdf\|Amdrum (Cheetah) Manual]] {{EN}} {{PDF}}
		+	* [https://framagit.org/offset/amdrum-acepansion Amdrum ACEpansion] on Framagit

	== Download ==		== Download ==

@@ Line 2: / Line 2: @@
 [[Image:Amdrum.JPG|thumb|250px|Box and Manual for the Amdrum]]
-The Amdrum is a 8bit D/A converter (hardware) with drumkit (software), made by the British company [[Cheetah]].
+The Amdrum is an 8bit D/A converter (hardware) with drumkit (software), made by the British company [[Cheetah]].
-Quality of the playback was nice, considering the time and price.
+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.
-The samples were read from the suplied tapes.
+Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page:
-−
-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 to use the Amdrum.
-−
 Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page :
 http://trastero.speccy.org/cosas/JL/JL.htm
@@ Line 200: / Line 188: @@
 * [http://www.worldofspectrum.org/hardware/feat42.html Another Spectrum review]
-[[Category:Peripherals]] [[Category:Music and sound]] [[Category:Manual]][[Category:Video contents]]
+[[Category:Peripherals]] [[Category:Music and sound]] [[Category:Manual]] [[Category:Video contents]]

@@ Line 39: / Line 39: @@
 |74LS32N||Quad 2-input OR||Port decoding, /DAC_WRITE when /ADDR_MATCH, /IORQ, /WR all LOW
 |-
-|SN74LS04N||Hex Inverters||purpose unknown? (used in the analog part, not for Port decoding)
+|SN74LS04N||Hex Inverters||Charge pump circuit, used to create negative voltage rail for the op amp
 |-
-|TL064CDP||Quad Amplifier||no info how the 4 amplifier stages are used?
+|TL064CDP||Quad Operational Amplifier||Buffer and low pass filter
 |-
 |Ferranti ZN428E-8||8bit DAC||mono one-channel 8bit D/A converter (unsigned samples)

@@ Line 111: / Line 111: @@
 <gallery caption="Amdrum Layout, thanks to Jose Leandro">
 File:Amdrum PCB.png|Amdrum - PCB Front
 File:Amdrum Layout.png|Amdrum - Layout

@@ Line 191: / Line 191: @@
 * [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://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]

@@ Line 184: / Line 184: @@
 * [[Media:Amdrum (Eagle).zip|Amdrum (Eagle).zip]] (Amdrum files for Eagle)
-== Links ==
+==  Weblinks  ==
 * [http://www.cpc-power.com/index.php?page=detail&num=4294 ''Amdrum'' from CPC-Power]
@@ Line 190: / Line 190: @@
 * [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://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]

@@ Line 16: / Line 16: @@
 Amdrum was probably Cheetahs version of the SpecDrum (As revealed on the PCB "AMSTRAD SPECDRUM")
-No other software than Cheetahs own sequencer is know to use the Amdrum.
+Aside of Cheetahs own sequencer you can use comme commands of the RSX ROM for LambdaSpeak III to use the Amdrum.
 Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page :

@@ Line 173: / Line 173: @@
 == Manual ==
-* [[Media:Amdrum Manual.pdf|Amdrum Manual]] {{EN}} {{PDF}}
+* [[Media:Amdrum Manual.pdf|Amdrum (Cheetah) Manual]] {{EN}} {{PDF}}
 == Download ==