According to the Complete Shadow ROM disassembly, the function that exits ... the BASIC interpreter after interpreting IF1 commands is this:

ROM is
05CC RST 18 ...

... of memory, where the shadow ROM resides, show that the ... jump to 0700h in the shadow ROM. This location contains a ... the hardware automatically unpages the shadow ROM. As the RET instruction ... Interface 1 partially decodes the shadow ROM and therefore, the last ...

Hiya, if you've got a hard copy of [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=2000371&loadpics=1"]Spectrum Shadow ROM Disassembly[/URL] that you're willing to part with then please send me a PM. Thanks!

... =2000371"]Gianluca Carri's Spectrum Shadow ROM Disassembly[/url] book (World of ...

... to initialise when the IF1 is not present casts ... decode lines from the missing IF1, causing it to lock ... to call code in the IF1 shadow rom. I would guess this ... code pages in the IF1 and calls IF1 ROM code, then on ... if you remove the ROM from a Speccy and ...

... to call code in the IF1 shadow rom. I would guess this is ... code pages in the IF1 and calls IF1 ROM code, then on return ... individual call to the IF1 shadow ROM or the Spectrum ROM).

[ ... of it!) — however, the IF1 is being accessed through the ...

... been included in the original ROM (mostly in that area that ... and streams support truncated. The IF1 shadow ROM is a workaround for this ... done is replaced the original ROM. However they'd sold too ... />
And what the BASIC ROM should have been:

... can use the ROM function. Read the Shadow ROM disassembly to understand ...
As I said, the Shadow ROM disassembly explains how this mechanism ... in the Interface 1 shadow ROM) that will cause a ... is very similar to the IF1 Shadow ROM method, varying only in ...

... to reading up on the IF1 shadow ROM

my first idea ...

... next byte. Not owning an IF1, I presume that the ULA ... something that replaces both the IF1 and Microdrive for a purely ... the IF1 shadow ROM. In other words, a CPLD, a flash ROM containing the IF1 shadow ROM ...

...
[CODE]$ mkfifo ~/fuse-if1-tx ~/fuse-if1-rx
$ fuse --interface1 ... Note that in reality, the IF1 shadow ROM must be busy polling for ... assumes the behaviour of the shadow IF1 ROM, so may not be ... for the IF1 if they don't simply make shadow ROM calls. ...

... strictly dependent on the IF1 shadow ROM, it does assume that ... when not polling in the shadow ROM.

I ... need to be in ROM, HALT would prevent debugging ... serial calls to std IF1 calls. The unknown part ... ) as there is for ROM, without you modifying the ...

... t strictly dependent on the IF1 shadow ROM, it does assume that ... new characters for the IF1 to receive, if we ... when not polling in the shadow ROM.

I ...
I'm using IF1 and Standard ZX Spectrum 48 ... ) as there is for ROM, without you modifying the ...

... at the code in the IF1 shadow ROM disassembly (make sure you're ... the same version of the IF1 ROM as the disassembly is based ... /> Without knowing anything about the IF1 routines, I'm not sure ...

... ($1981) indicates you have an IF1 Issue 1 variant
; ... d, do not have an IF1 connected, running under emulation ;)
IF1 Issue 3 variant... :)
;< ... /> hd_11 equ $5ced ; jump to shadow rom address
;
exx ; save ...

... 1 with a version 1 Shadow Rom, I would like to update ... 2.

I think IF1 Rom v2 code could be burned ... there maybe a version 3 rom, was that ever released.

... the if1
defb $32 ; hook code to call any shadow rom address ...

... allows bidirectional communications between IF1 and Microdrive, for ... Book, the Spectrum Shadow Rom Disassembly, the IF1/Microdrive Service Manual, ... />
From the Shadow Rom Disassembly, it is apparent that ... synchronized somehow. The IF1 has its own 8 ...

The old Sinclair IF1 has offered an easy ... : The use of the shadow variable VECTOR. This is ... the same as for the IF1, even worser: they may ... for different versions of the shadow ROM! For instance, the STK ... on #2274, even for shadow ROMs of the same version ...

... would be to port the IF1 ROM across to run in ...
Also, the Sea Change ROM should be able to use ... Sea Change ROM, and I have the Complete Shadow ROM Disassembly book ... , containing a nice commented listing of the IF1 ROM ...

... , even when shadow RAM is paged into the ROM area. I ... Sea Change ROM, and I have the Complete Shadow ROM Disassembly book ... , containing a nice commented listing of the IF1 ROM ... 're planning to port the IF1 ROM: Will I, or anyone ...

... extra kilobyte of RAM. When shadow ROM is paged in, between adresses ... , RAM is selected instead of ROM! This memory area is used ... RAM for the workings of IF1 is stored on a 2K ...

... a number to indicate the IF1 version (if any)...[/QUOTE]< ... br />
[CODE];
; another if1 rom check that doesn't corrupt ... ;
rst $08 ; page in shadow rom and
defb $31 ; call ...
;
; with an if1 fitted, calling the init routine ...

... aren't rare. However the ROM carts are rare and were ... like Opus discovery, MGT PlusD, IF1 and Microdrives also should get ... , whereas I picked up the Shadow Rom Disassembly for 99p - go figure ...

WOS also has The Complete Shadow ROM Disassembly, which is an interesting thing to read. It also explains the paging mechanism for the IF1 ROM, and why the traps are at the addresses that they are at.

... at 0x0008 in the shadow ROM has an incredible detective ... the 0x0008 trap in the IF1 disassembly (as I had ... of gnarly code in the IF1 ROM.

Given ... than the ULA on the IF1, when I did the ... (in general) compared to IF1, is that the Spectranet traps ...

... completely, and interface with IF1 directly via the mini- ... exotic permutations possible with the IF1/Microdrive/RS232.

Shadow ROM disassembly, and also to the IF1 technical ... 'real' operation; the 'IF1 direct' solution would require less ...

... @DEEK function to Spectrum with IF1.
The caveat is that ... )
stackbc equ 2D2Bh ;16K ROM, stacks BC onto calculator
let equ 2AFFh ;16K ROM, 'LET' statement handling routine
cheat equ 1731h ;16K ROM code that does C

... 's a shame that the IF1 programmers did not vector the ... -around shadow ROM in the first place. You don't need the IF1 ... error routine without using a shadow ROM. Just PUSH the address of ...

... to write a work-around shadow ROM in the first place.[/QUOTE ... Dr Ian the 'father' of IF1 hardware.
When Dr Logan ...