* 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 (this causes an [[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 is a reset)* This checks the BASIC ROM version, and clears the extra ram if a BASIC ROM from a CPC6128 is found.* Uses NMI* Only captures upper/lower ROM enabled state and nothing else. 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. This also means that c000-ffff reads unmapped ram when ram is not actually enabled.* Menu code is at offset &3810 and is copied into RAM at &A200. * ram is disabled when the transtape returns to the program and can only be enabled using i/o port.* Uses port FBF0 (write only) FBF0 decoding is: 1111 1011 1111 00xx
Code 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.
0000 f3 di ;; disable maskable interrupts* an opcode read of an address with the following bits: 0001 0100df ld bc,0df00h ;; select upper rom 00011 1xxx xxxx xxxx 0004 ed49 out (c),c 0006 01817f ld bc,7f81h ;; enable upper causes the ram and rom to be disabled. (mode 1 tooit jumps to 3800 in the ROM to restore the state) 0009 ed49 out * Uses port FBFF (cinput),c. 000b 31febf ld sp,0bffeh ;; setup stack which bit 7 is not initialised after resetused to report lower rom and upper rom enabled state. 000e 3a02c0 ld Transtape ROM performs a,read of 3ffe (0c002hlower rom) ;; read BASIC ROM version number 0011 fe02 cp 02h ;; CPC6128? 0013 cc2e0c call z,0c2eh ;; erase extra RAMand fffe (upper rom) and records the state of ROMEN.
;; this appears to set it up for a reset.. 0016 210000 ld hl,0000h 0019 e5 push hl 001a e5 push hlDecoding of FBFF is: 001b c30038 jp 3800h ;; I think the hardware monitors for address 3800h and if found disables the ROM1111 1011 1111 11xx
* Uses NMI
* Doesn't appear to capture the hardware state like the Multiface does. Code in the ROM reads the PPI state, AY registers, and CRTC registers 12,13,14 and 15 and stores there values and restores them later.
* When a write happens to their RAM it appears to write through to the RAM behind??
* Menu code is at offset &3810 and is copied into RAM at &A200.
* Uses port FBF0 (output), FBFF (input). Don't know the exact functions yet.
writing 0 to fbf0 disables it's internal rom.
* The same plastic case is used by the Spectrum version of this interface.
* The spectrum version has two switches on the top. One of which chooses load/save.* In the Amstrad these holes are filled with plastic caps. Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page : http://trastero.speccy.org/cosas/JL/JL.htm We can know more about this hardware.
== Pictures ==
Image:Transtape_PCB_Top.jpg|PCB Top
Image:Transtape_PCB_Bottom.jpg|PCB Bottom
Image:Transtape - pantalla1.jpg|Screen 1
Image:Transtape - pantalla2.jpg|Screen 2
</gallery>
<gallery caption="Transtape Layout, thanks to Jose Leandro">
File:Transtape front box.jpg|Transtape - Front Box
File:Transtape back box.jpg|Transtape - Back Box
File:Transtape up box.jpg|Transtape - Up Box
File:transtape box open.jpg|Transtape - Box Open
File:Transtape PCB Components.jpg|Transtape - Components
File:Transtape PCB Tracks.jpg|Transtape - Tracks
File:Transtape-PCB Front.png|Transtape - PCB Front
File:Transtepe-PCB Back.png|Transtape - PCB Back
== Manual ==
* [[Media:Transtape Manual.pdf|Transtape (Micro HardMicro) Manual]] {{ES}} {{PDF}}
== Downloads ==
* [[Media:Transtape-ROM.zip|Transtape-(ROM).zip]] (Transtape ROM)* [[Media:Amstrad-Transtape (eagle).zip|Transtape (eagleEagle).zip]] (Transtape files for Eagle) == Weblinks ==
* http://cpcrulez.fr/hardware-interface_debug-transtape_ASO.htm== Weblinks ==
* [http://www.cpc-power.com/index.php?page=detail&num=9321 ''Transtape'' from CPC-Power]* [http://cpcrulez.fr/hardware-interface_debug-transtape_ASO.htm ''Transtape'' from CPCrulez]* [http://hardware.speccy.org/temp/Amstrad-transtape.html''Transtape'' from hardware.speccy.org]
[[Category:Copy Protection]] [[Category:Peripherals]] [[Category:Manual]]