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The PlayStation 1 had two megabytes of main memory, one megabyte of video memory and half a megabyte of audio memory. Squeezing everything to fit into these limits was one of the big challenges of developing a game.

As with other consoles, games were written using specialized, expensive, proprietary development kits provided by Sony, which had similar hardware to the regular console but also the ability to download software. (There seems to have also been a development kit version called 'Net Yaroze' which was cheaper, less capable and sold to hobbyists; I'm talking here about the regular kit, sold to licensed commercial developers.)

From a developer viewpoint, it would be advantageous to have more memory in the development kit, so you wouldn't have to worry about squeezing your code and data until after doing your iteration on the gameplay.

How much memory did the (standard, official) PlayStation development kit have?

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    From memory, the debugging version of the console had 8mb. I have no idea why I think I know that though. Would prefer somebody to answer more confidently. – Tommy Jan 30 at 12:37
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For the PlayStation 1, development was done on a development kit which fit inside a PC; this included two ISA cards, and had 8 MiB of RAM for the PlayStation CPU.

Pre-production testing was done on debugging consoles, which were closer to the production hardware, and only had 2 MiB of RAM. SN Systems (which designed the development kit) also produced a board and connector which allowed the debugging consoles to be used for development.

See also Wikipedia’s list of PlayStation models.

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