Acorn A5000 Manuel d'utilisateur

Speeding Up the A5000 1 Speeding upARCHIMEDES A5000ComputersbyNICK SMITH ET AL

Bit 7 (0-7) of byte &BC is ‘Hardware test disable’ and when set to 1 will disable long tests at power up. Becausethis CMOS byte has other uses

REM Speed up ROM access REM speed%=3 is the fastest 0 the slowest. NB speed%=3 is likely REM to cause a machine crash with RISC OS 3 ROMs. speed

Ground Control strongly implied that the chips would ‘probably’ run much faster than their rated 36Mhz. Speeds of up to 40 or even 42Mhz were suggeste

If you remember in an earlier section Owen Smith mentioned some ’synchronisation state machines’ to deal withthe memory and IO running at different sp

DISLCAIMER: All views expressed are our own (or those quoted) and not necessarily those of anyorganisations that we work for or have worked

Xref: demon comp.sys.acorn:2187 comp.sys.acorn.tech:1336Path: demon!bnr.co.uk!uknet!warwick!pipex!pavo.csi.cam.ac.uk!nas20From: [email protected] (Ni

SUMMARYThis is the initial version of my ‘Guide to turbo A5000s’ a detailed description on how to get an extra 5 MIPSspeed out of a standard A5000 for

INTRODUCTIONWith a 25MHz ARM3 and 12MHz RAM the A5000 is a powerful computer (clocking about 13.5 MIPS - MillionInstructions Per Second) but it is qui

3. Heat conductive adhesive. Farnell [HTC10S]; £1.45 for a 10ml syringe. 4. Range of replacement Can Oscillators. Advanced Crystal Techn

* Can mess up the timing of the rare (modern) game which uses a 36MHz mode so the game would go slightlyfaster.If you increase the crystal speed suffi

try in the memory at the moment. I have heard reports of standard 70ns RAM in an A5000 running atover 20MHz !Here is an important warning on increa

went in before letting go - they have a thin red stripe on one edge to help. One of the most frequentmistakes that friends and I have made in the pa

If any test fails, the screen will remain red and the disc drive light will blink a fault code. A short flash isused to indicate a binary ‘0’ and