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  4. The Apollo Guidance Computer [video + slides]

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  5. Follow-up article on visualizing errors of 1541 disks:

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  6. Visualizing Commodore 1541 Disk Contents – Part 2: Errors In order to understand the encoding and potential read errors, it is useful to visualize C64/1541 disks sector-by-sector.

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  7. Commodore “Video Supergame 64” Bundle The “Video Supergame 64” is a Commodore 64 bundled with a joystick and three games on a cartridge, sold mainly in Germany in 1988/1989. Here are some pictures.

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  8. Dumping Commodore 64/1541 Disks with Errors Many old Commodore 64/1541 disks have read errors, but this doesn’t mean the data isn’t recoverable – with the right nibtools settings and some cleaning.

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  9. Commodore “Magic Voice” Cartridge for C64 “Magic Voice” is an expansion cartridge for the Commodore 64 that can speak 235 predefined words. Here are some pictures.

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  10. Falk Rehwagen, TopDesk and GEOS Here are some of Falk Rehwagen’s thoughts on his involvement with GEOS and TopDesk.

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  12. TopDesk 1.3 GEOS64/128 Original Source Thanks to Falk Rehwagen and Jürgen Heinisch, the original source of the TopDesk file manager for the GEOS operating system of C64/C128 is available.

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  13. Converting a Commodore 1541 or 1570 Drive into a 1551 The 1551 is the weird outlier of Commodore drives: It is the only drive using the “TCBM” bus. And what’s even weirder? 1541 and 1570 drives converted into 1551s!

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  14. More Original Commodore Source Code There have been a few new interesting additions to the Commodore Source Code repository, including: RAMDOS, 1570, 1571CR, 1551 and 1541

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  15. Commodore Peripheral Bus: Part 5: TCBM The C16/C116/Plus4/1551 "TCBM" bus was supposed to be faster but as cheap as the C64 Serial Bus. It wasn't much faster, probably not cheaper, and had lots of design issues.

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  16. Run CP/M on your C64 – using Emulation! The Roßmöller CP/M Emulator for C64 "borrowed" an 8080 emulator for 6502, and the CP/M OS.

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  17. C64 CP/M Cartridge The cartridge that makes a C64 a “dual processor” computer: Commodore’s CP/M cartridge for C64 contains a Z80 CPU and comes with version 2.2 of the CP/M operating system. Here are some pictures.

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  18. Commodore Bildschirmtext II Decoder Cartridge Here are some pictures of the outside and the inside of a Commodore Bildschirmtext II Decoder Cartridge for the C64 – a 6800-based computer connected to the expansion port!

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  19. Sinclair ZX81 Kit Here are hi-res photos of an unassembled Sinclair ZX81 kit, with German assembly instructions.

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  20. Blue Chip BCD/5.25 Disk Drive After previously dissecting the firmware of alternate C64 disk drives, let’s now look at the hardware of one: This is the Blue Chip BCD/5.25.

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