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GX4000 cartridge

834 bytes added, 10:11, 20 February 2010
/* Technical specs. */
== Technical specs. ==
There are different versions of the cartridges which contain EPROMs of different sizes. To indicate the EPROM size to the CPC+, different combinations of [[LK Links]] have to be shorted.
{|{{Prettytable|width: 700px; fontThe cartridges can be fitted with different EPROMs in range of 32K through 512K (actually produced are only 128K..256K). The cartridge PCBs typically include six [[LK Links]] to match the PCB to the EPROM pin-sizeouts: 2em;}}|'' VCC ---LK1--- EPROM type''||''.A18 ---LK2--- CA18 VCC ---LK3--- EPROM size''||''Contacts''.A17 ---LK4--- CA17| VCC ---LK5--- EPROM.A15 ---LK6--- CA15||27C512||64kb||LK3Usually the following LKs should be installed:| (----- EPROM -----) (------------------------ Links installed -------------------------) Type Pins Size A15 A17 A18 27C256 28 32K LK5 (A15=VCC=High) LK4 (A17=VCC=Supply) N/A 27C512 28 64K LK6 (A15=A15=Address) LK4 (A17=VCC=Supply) N/A|| 27C1001||128kb|| 32 128K LK6 (A15=A15=Address) LK1 + LK6|-(A18=VCC=/PGM) N/A| 27C2001||256kb|| 32 256K LK6 (A15=A15=Address) LK1 (A18=VCC=/PGM) LK3 + (A17=A17=Address) 27C4001 32 512K LK6 (A15=A15=Address) LK2 (A18=A18=Address) LK3 (A17=A17=Address)|}Some cartridge PCBs don't have any LKs installed, instead, the etched circuit has hardwired connections between some of them. One could scratch them off, and then use the LK soldering points to reconfigure the board for eproms of other size.
== Misc ==
[[RAM7]], a French hardware developer, created a device to hack [[RAM7 Cartridge Hacker|CPC Plus cartridges]].
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