Ultimate ATARI xe/xl ram pack - two upgrades set.
- Ultimate 1MB revised 2k24 - LINK
- Sram 64 kb revised 2k24 - LINK
Sold as SET ONLY.
Disclaimer:
- If you are not familiar with soldering or you do not have proper tools, please LET a pro technician do it for you or send me your ATARI BOARD for installation. Upgrade installation cost is 50€ only. Contact me to arrange installation.
- Please remeber - wrong tools usage or low skills may damage atari and ultimate; any damage/harm to your hardware is NOT subject of any kind of warranty.
- Installation is easy, but unexperienced hands can do a lot of damage. Please, refer to FAQ first
STEP BY STEP:
- locate MMU (20 pins) and OS ROM (28 pins) and their pins no1
General rule of pin identification - click for larger picture
SRAM MODULE PART:
- REMOVE old RAM CHIPS ( hint: not necessary actaully; if Your ram do not get hot, You can remove resistors on data lines to ram and keep ram chips intact)
- at this moment make ONE CONNECTION between CI point at sram module to CAS_INHIBIT SIGNAL at ATARI board (example: mmu pin 16)
- install SRAM MODULE under MAIN CPU; insert CPU to SRAM MODULE
- POWER ON ATARI - it shall work with new SRAM
ULTIMATE 1MB PART:
- Remove CPU from SRAM SOCKET
- If Your chips (MMU AN OS) are in sockets:
- Desolder CI cable to SRAM (soldered in first step)
- Remove MMU (20 pins) and OS ROM (28 pins) chips from their sockets
- Insert flat cable with "chip-adapter" side into MMU and OS ROM sockets ( RED STRIPE cable indicates PIN 1 of removed chip)
- Make proper 4wire connection of ULTIMATE with SRAM MODULE (o2, rw, rst, halt)
- Connect flat cables with "IDC-side" to ultimate board ( RED STRIPE cable indicates PIN 1 ultimate connector)
- Fix ULTIMATE PCB inside Atari
- If Your chips (MMU AN OS) are not in sockets:
- Desolder CI cable to SRAM (soldered in first step)
- desolder MMU (20 pins) and OS ROM (28 pins) from atari pcb
- Solder sokcets into atari pcb (sockets are not supplied by me)
- Insert flat cable with "chip-adapter" side into MMU and OS ROM sockets ( RED STRIPE cable indicates PIN 1 of removed chip)
- Make proper 4wire connection of ULTIMATE with SRAM MODULE ( o2, rw, rst, halt)
- Connect flat cables with "IDC-side" to ultimate board ( RED STRIPE cable indicates PIN 1 ultimate connector)
- Fix ULTIMATE PCB inside Atari
- Solder CI cable from SRAM to ULTIMATE 1MB /dedicated point/
- Solder EXT_SEL from SRAM to ATARI / this signal is present in many places, please refer to atari schematic .. in XE NON ECI version ignore connecting EXTSEL/
- put CPU back
READY! You can power on Atari, enter setup (HELP + RESET) and adjust all you want!
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