-
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... the Z80, the ULA, the ROM, the RAM combined that process ... Molex connectors?
Problem with socket for Z80 or ULA?
ROM
[*]to measure the resistance ... -
Testing a +2I recently picked up a non functioning Spectrum +2 Grey (Issue 3 board?), and am just beginning to go through and see what needs to be done to it. I …
... several checks like socket contacts, ULA function, Z80 function, ROM function, capacitors ... function
a. Use diagnostic rom (I use Paul Farrow's ... -
ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…
... />
However, the Interface 1 ROM was still not linked in ... bad soldering on the processor socket I guess, or damage to ... -
DIVIDE PLUS - new memory mode DIVIDE128Divide PLUS contain 512kB sram + 512kB flash eprom. Memory paging in this device is enable on two different ports : 1) port #E3 is compatible with o…
... to DIVIDE128 mode with mapram (rom emulation):
[ ... bytes
LDIR ;copy rom image with divide system from ... to all ram pages for rom emulation(mapram pages)
... 1(memory ROW1)
RST 0 ;restart system from first ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... /> Recommendations, anyone? :S I can socket the Z80 if necessary; perhaps ... my +3 is in a socket, will have to check after ... : any chance of a test ROM? Happy to pay for materials ... -
Colour whilst PLOTing in MCI am using the ROM PLOT routine at $22E5, how do I control the colour of the results, so I can preferably use INK 8, it seems to have a mind of its o…
... ;708459]I am using the ROM PLOT routine at $22E5, how ... and PAPER controlcode with the RST #10 printroutine.
16 ... />
LD A,16
RST #10
LD A,6 ...
RST 16
will set ... -
FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…
... 's a call to the ROM "out of screen" error report ... />
jr c, in_screen
rst 8
defb 4
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... pressed
jp z,0x1b7b ; ROM routine indicating BREAK (code L ... was a tape error
rst 8 ; error restart
defb ...Use 28C64B for Opus, not 28C64Just solved a small problem upgrading an Opus Discovery. I was trying to swap the 2.1 rom with a 2.22 version. So programmed an Atmel AT28C64, place…
... occupied the free space in ROM with hard disk stuff when ... switch (plus an in-between socket with one pin bent away ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... pressed
jp z,0x1b7b ; ROM routine indicating BREAK (code L ... was a tape error
rst 8 ; error restart
defb ... if it's in the ROM
ret nz ; return if ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
...
jp z,0x1b7b ; ROM routine indicating BREAK (code L ... was a tape error
rst 8 ; error restart
... br /> and a ; wrapped into ROM = all attrs loaded
ret ...Hardware description - PLUS D interfaceThis new thread will contain onformations of different ZX devices. Some devices contain manuals, schematics or firmware for some chips, but some peop…
... jump to 00000000 00001000 = #0008 (RST 8)
; or 00000000 00111010 ... connection is from #0000-#1FFF ROM 8kB
/RAMCS ...Hardware description - MB-02+ interfaceOn this thread will soon released info about MB-02+ idisk interface ( memory paging mechanism, list of ports, addressing, MB IDE, schematics, etc... …
... connect instead ZX rom external 16kB rom page number 0 ... rom)
Original MB-02+ interface contain on PCB big socket ... for rom chips with maximal capacity 64kB, but in rom socket ... is originally placed small 2kB rom chip. Then ...Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... am cheating and using a ROM routine... but I am but ... ; LD A,21 "!"
D7 ; RST 10
C9 ; RETurn to ... nightmare....
Whats the ROM magic?
Time to ... look up the Rom Dissasembly book.. (very nice!)
Wanted: broken motherboard!Does anyone have a motherboard for a 48k (any issue) that is currently not working? I'm looking to set up a test board for chips, and would like to g…
... of one that I can socket throughout.... If you have a ... of course Paul Farrows diag rom.Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... 48 (H)
D7 ; RST 10
C306F0 ; JP ... LD A,20 " "
D7 ; RST 10
3E57 ; LD A ... LD A,21 "!"
D7 ; RST 10
C300F0 ; JP 61440 ... />
still using stargate rom jumps to work the magic ...DivIDE not working not starting on a 128k +2AMy newly bought DivIDE (57c version) BenVersteegs Black Edition (with 4 GB CF-Card) with installed ESXDOS 0.8.5 firmware don?t boot up on my +2A Spec…
... ;724074]It's really 128K ROM in black +2. It means ... removed both the Amstrad +2B ROM chips (IC7 and IC8 ) and ... removed both the Amstrad +2B ROM chips (IC7 and IC8 ) and ... / ROM like a DivIDE.
Is there an empty socket inside ...DivIDE not working not starting on a 128k +2AMy newly bought DivIDE (57c version) BenVersteegs Black Edition (with 4 GB CF-Card) with installed ESXDOS 0.8.5 firmware don?t boot up on my +2A Spec…
... / ROM like a DivIDE.
Is there an empty socket inside ... />
thanks for help. Indeed: Socket 8 is empty , please have ...Faulty +3Hi all Hoping this isn't the 40077 dead on my +3 but....... [IMG]http://www.darrenwileman.co.uk/SPEC/Plus3.jpg[/IMG] Tried the following in anothe…
[QUOTE=kpuchatek;724168]You may check ROM sockets, lack of good contact can cause such effect.[/QUOTE]
Thanks, the contacts on the socket look good, not tarnished - retouched the solder on them now, so will try the ram later.Faulty +3Hi all Hoping this isn't the 40077 dead on my +3 but....... [IMG]http://www.darrenwileman.co.uk/SPEC/Plus3.jpg[/IMG] Tried the following in anothe…
... of no ROM, as the CPU ends up executing RST 38 instructions ... />
I'd recheck the ROM socketing, and if you don ...Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …
... CODE]
ROM EQU #7F; Page in ROM
RAM EQU ... br /> ;
COPY_R OUT (ROM),A; Page out RAM
LDIR
OUT (ROM),A; Page out RAM
RST 0
CODE_E
...Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…
... burned with a 2.2 ROM (the old one was dead ... RAM has been fitted (the socket was empty).
Does ... it, a 2.31 Quickdos ROM should be a better choice ...SoftPLAY: Use the PLAY command from 48 BASICNow you don't need 128 BASIC to use the [B]PLAY[/B] command. Just use [B]PRINT #8;[/B] instead. [url]https://dl.dropboxusercontent.com/u/15659782/So…
... code via modifiing original ZX48 rom. Only write at address #000B ... will have to do the RST 8 handler though as I ...SoftPLAY: Use the PLAY command from 48 BASICNow you don't need 128 BASIC to use the [B]PLAY[/B] command. Just use [B]PRINT #8;[/B] instead. [url]https://dl.dropboxusercontent.com/u/15659782/So…
... will have to do the RST 8 handler though as I ... at address #000B in ZX rom must be JP #ZXRAM and ... 't call parts of ZX rom, only after return from PLAY ...Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …
... at the stage where the ROM images should be loaded. Either ... is connected to the "MIC" socket. I've already asked if ... using the "Ear" socket to load was a mistake ... a card and stored the ROM/SHADOW ROM then I could hold ...Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …
... at the stage where the ROM images should be loaded. Either ... impossible, loading through the ?MIC? socket was obviously not envisaged by ... ?s hardware designer. The ?EAR? socket has a much lower impedance ... a card and stored the ROM/SHADOW ROM then I could hold ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... 'ROM-0 ENTRY' SUBROUTINE
org 0x0007
rom0_entry:
rst start ... ; jump back to start when coming from ROM 0 ... black
; ld e, 8 ; ROM 0, VRAM 1
ld ...
out (c), e ; set ROM and VRAM page
ret ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... br /> ld a, %00001111 ; ROM 0, VRAM1, RAM 7
lc_error:
rst error ; else
defb integer_out_of_range ... br /> ld a, %00001111 ; ROM 0, VRAM1, RAM 7
ROM 0)
.endif
