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Sothius' Home-Museum- Commodore-Commodore 64G-additional pictures

Commodore 64G
Additional pictures. Note that loading the page could take a while...
(pictures copyright by M.A.Grundke)

Commodore 64G serial number (28 KBytes)
serial number: DA4 347604
They could've treated the sticker better!



ASSY 250469 overview (50 KBytes)
Overview of the ASSY 250469 board:
This board is highly integrated, compared to the classic ones. Most of their 'TTL-graves' are gone, and production costs are minimized (that's why this board was also used for later C64C). However, this is not the final C64 board-layout - in these, the color SRAM (here between CPU and MMU) had been integrated in the MMU itself. But the most significant change besides the higher integration is, that most chips have changed their location in this layout. They all seem to be 'lined up' from left to right: second CIA (U2) at the leftmost position, followed by the two ROMs (U5 CharROM and U4, which now contains CBM BASIC and CBM Kernal), the CPU (U6) with the two 64Kx4-RAMs below it (U10,U11), then MMU (U8), color SRAM (U19), the VIC-II and the clock generator MOS 8701 (U7, U20), and finally SID (U9), the first CIA (U1) and the keyboard connector (CN1)



Commodore 64G board silkscreening (23 KBytes)
board silkscreening:
PCB ASSY NO. 250469
PCB NO. 252311 REV.A
As you can see this is exactly the same board-revision like that of my C64C. That's because both machines were sold simultaneously for a while, and older board revisions were discontinued



CSG 8500 (44 KBytes)
The CSG 8500, HMOS-2-produced version of the MOS 6510. Otherwise it's completely identical, so there shouldn't be any incompatibilites



MOS 251715-01 (44 KBytes)
The MOS 251715-01 memory managment unit (made by SHARP as SHARP LH5062B). This chip saves room and production cost, since it integrates many TTL-circuits of the older boards, plus their MOS 906114-01 PLA ('programmable logic array'). It was used in board revisions from 1987 on, when the 'Aldi' C64G appeared on the German market (so it was also used in the later C64C, since these used C64G-boards as well)



RAM bank (36 KBytes)
These two tiny chips contain 64 KBytes RAM (2 pcs. NEC D41464C-10, 64Kx4 organized). Again, an enormous reduction of cost and needed room, compared with the ealier machines 8 pcs. 64Kx1



VIC-II & MOS 8701 & color RAM (49 KBytes)
The CSG 8565R2 VIC-II is a new 5V, 'low power' version of the classical MOS 6569, fitting the new HMOS-2 chipset better. Interesting on the ASSY 250469-boards is that VIC-II and clock generator (MOS 8701, behind the VIC-II on this picture) are not shielded anymore. Before it, however, the color SRAM (for screen color data storage), which here is a SANYO LC3514A-15 (1Kx4)



CSG 8580 SID (36 KBytes)
CSG 8580, SID. Again this is just a HMOS-2-version of its ancestor, the MOS 6581 (running at 9V now)



CSG 6526 CIA (46 KBytes)
One of the C64G's two CIAs. Behind it, the keyboard connector and a MC14066BCP quad analog switch



Commodore 64G ROMs (54 KBytes)
The C64G's ROMs:
C251913-01 (contains the 901226-01 BASIC and 901227-03 KERNAL ROMs) and C901225-01 character generator ROM. Before them, the second CIA



Also have a look at the C64C (ASSY 250469) page
(same board revision but with a slightly different upmost layer)


Sothius' Home-Museum- Commodore-Commodore 64G-additional pictures