@retrozygi, post #60
@Rafał A-3000, post #63
@MariuszK, post #51
THE FOLLOWING INSTRUCTIONS DETAIL THE CHANGES WHICH MUST BE IMPLEMENTED TO
UPGRADE A U.S. A2000 PCB FROM REV 4.0 (or higher) TO REV 4.5. CURRENT
PRODUCTION BOARDS ARE EITHER REV 4.5 W/O NEW AGNUS, OR REV 6 W/ NEW AGNUS. ALSO
NOTE: SOME REV 6 PCBS MAY HAVE A DRAM TOWER AND STATIC COLUMN DRAMS, SOME MAY
NOT. FIELD UPGRADES ARE NOT RECOMMENDED ON REV 3.X PCBS.
26/3-2.1 A2000 FIELD UPGRADE TO REV 4.5
1) THE FOLLOWING COMPONENTS MUST BE REMOVED IF INSTALLED.
R901, C917, C902 LOCATED LEFT OF CN601 NEAR PIN 1.
C910, C911 (FIX FOR HYTEK KEYBOARDS). LOCATED
OFF KEYBOARD CONNECTOR, CN300)
C905, C908 C908 LOCATED ABOVE CRYSTAL X1
C905 BELOW GARY PIN 20
C230, C240 LOCATED ABOVE U204, U303 (BETWEEN PIN 34 OF THE DRIVE CONNECTOR AND U301)
2) REPLACE 1.2 KICKSTART PROM WITH 1.3
3) INSTALL RP904, RP905, RP906 ONLY IF U205 AND U206 ARE 74HC244 TYPE
ICS (RESISTOR PACK IS 4.7K OHM X 5, 6 PINS). DO NOT INSTALL IF ICS
ARE 74HCT244 TYPES. RP905 IS LOCATED BETWEEN U205 AND U206. RP906
IS LOCATED BETWEEN PAULA AND DENISE. RP904 IS TO THE RIGHT OF
DENISE.
4) ADD .01uF CERAMIC CAP ON J300. ADD THIS CAP ON SOLDER SIDE OF PCB,
FROM PIN 12 (MIDDLE PIN ON CONNECTOR) TO GROUND (USE EITHER GROUND
PAD LOCATED ON SOLDER SIDE, DOWN AND TO THE RIGHT - ABOVE PAULA
PINS 46 AND 48).
5) ADD 3.3 OHM 1/4 WATT RESISTOR TO PINS 11 & 20 OF U605.
6) ADD 470 OHM 1/4 WATT RESISTOR TO D800, CATHODE SIDE, TO THE
SECOND PAD FROM THE LEFT, UNDER CN605. (D800 IS LOCATED TO THE
LEFT OF THE RTC AT U801). NOTE: ON REV 4.3 AND ABOVE THIS
RESISTOR IS ON PCB AS R1000, LOCATED TO THE LEFT OF Q302.
7) IF R5719 IS NOT PRESENT (LOCATED OFF PIN 1 OF CN400) ADD 470 OHM
RESISTOR BETWEEN VCC AND CPU SIDE OF R106.
8) REPLACE GARY IC AT U102 WITH MOS TYPE (PART NUMBER 318072-01).
ONLY MOS TYPE ARE IN STOCK.
@retrozygi, post #75
@Jaro2k , post #77
Jak juz na serio bedzie bieda to zapraszam do mnie. Nie mam co prawda sprawnej a2000 ale na a3000 powinna ta karta jakos byc widoczna. Sprawdzi sie i karte i dysk.
@*y, post #79
@*y, post #79
No to super! Ja jednak tak na wszelki wypadek wsadziłbym jakąkolwiek inną kartę ZII z autoconfig'iem do twojej A2000, bo twoja karta to produkt równie stary co A2000 i byłoby dziwne, że GVP nie uwzględniło płyt A2000 ver.4.1...
@_Skiba, post #82
@*y, post #84
@_Skiba, post #88