View source for Transtape

A Spanish Hacking Device from HM (Hard Micro, S.A.).

[[Image:Transtape.jpg|right|thumb|250px|Transtape]]

== Technical ==

* Uses a 16KB ROM paged into memory at &0000.
* Uses a 8KB static RAM paged into memory at &c000-&dfff and repeats again at &e000-&ffff.
* ROM is paged into the range &0000-&3fff when the red button is pressed and the NMI vector is executed.
* When the black button is pressed, the ROM is paged into the range &0000-&3fff and executes it at &0000.
* This checks the BASIC ROM version, and clears the extra ram if a BASIC ROM from a CPC6128 is found.

Code:

 0000 f3        di                               ;; disable maskable interrupts
 0001 0100df    ld      bc,0df00h		;; select upper rom 0
 0004 ed49      out     (c),c
 0006 01817f    ld      bc,7f81h			;; enable upper rom (mode 1 too)
 0009 ed49      out     (c),c
 000b 31febf    ld      sp,0bffeh                ;; setup stack which is not initialised after reset
 
 000e 3a02c0    ld      a,(0c002h)               ;; read BASIC ROM version number
 0011 fe02      cp      02h                      ;; CPC6128?
 0013 cc2e0c    call    z,0c2eh		        ;; erase extra RAM
 
 ;; this appears to set it up for a reset..
 0016 210000    ld      hl,0000h
 0019 e5        push    hl			
 001a e5        push    hl
 001b c30038    jp      3800h                    ;; I think the hardware monitors for address 3800h and if found disables the ROM

* Uses NMI
* Doesn't capture the hardware state like the Multiface does. Code in the ROM reads the hardware state which it restores when resuming the program.
* RAMDIS is asserted when ROM or RAM are active meaning no write through to ram behind.
* Menu code is at offset &3810 and is copied into RAM at &A200. 
* Uses port FBF0 (output), FBFF (input). 

 FBF0 decoding is:
 1111 1011 1111 00xx

 FBF0 output:
 bit 0 is ram enable/disable state
 bit 1 is rom enable/disable state
 bit 2 is A10 on RAM
 bit 3 is A11 on RAM
 bit 4 is A12 on RAM
 bits 5-7 are not used.


* The same plastic case is used by the Spectrum version of this interface.
* The spectrum has two switches on the top. One of which chooses load/save.
* In the Amstrad these holes are filled with plastic caps.

== Pictures ==

<gallery caption="Transtape">

Image:Transtape_Front.jpg|Front
Image:Transtape_Back.jpg|Back
Image:Transtape_PCB_Top.jpg|PCB Top
Image:Transtape_PCB_Bottom.jpg|PCB Bottom

</gallery>

<gallery caption="Transtape Layout, thanks to Jose Leandro">

File:Transtape-PCB Front.png|Transtape - PCB Front
File:Transtepe-PCB Back.png|Transtape - PCB Back
File:Transtape Layout.png|Transtape - Layout

</gallery>

== Manual ==

* [[Media:Transtape Manual.pdf|Transtape (Micro Hard) Manual]] {{ES}} {{PDF}}

== Downloads ==

* [[Media:Transtape-ROM.zip|Transtape-ROM.zip]] (Transtape ROM)
* [[Media:Amstrad-Transtape (eagle).zip|Transtape (eagle).zip]] (Transtape files for Eagle)

== Links ==

* http://cpcrulez.fr/hardware-interface_debug-transtape_ASO.htm

* http://hardware.speccy.org/temp/Amstrad-transtape.html

[[Category:Copy Protection]] [[Category:Peripherals]] [[Category:Manual]]